Fluid Dynamics Research

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tab"> Open all abstracts<span class="offscreen-hidden">, in this tab</span> </button> </p>  <div class="art-list"> <div class="art-list-item reveal-container reveal-closed"> <div class="art-list-item-body"> <div class="eyebrow"> <span class="offscreen-hidden">The following article is </span><span class="red">Open access</span> </div> <a href="/article/10.1088/1873-7005/ad8516" class="art-list-item-title event_main-link">Particle migration due to non-uniform laminar flow</a> <p class="small art-list-item-meta"> M A Curt Koenders and Nick Petford 2024 <em>Fluid Dyn. Res.</em> <b>56</b> 055508 </p> <div class="art-list-item-tools small wd-abstr-upper"> <button type="button" class="reveal-trigger mr-2 nowrap"> <svg aria-hidden="true" class="fa-icon fa-icon--left fa-icon--flip" role="img" focusable="false" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 320 512"><path d="M137.4 374.6c12.5 12.5 32.8 12.5 45.3 0l128-128c9.2-9.2 11.9-22.9 6.9-34.9s-16.6-19.8-29.6-19.8L32 192c-12.9 0-24.6 7.8-29.6 19.8s-2.2 25.7 6.9 34.9l128 128z"/></svg><span class="reveal-trigger-label" data-reveal-text="Open abstract" data-reveal-label-alt="Close abstract" data-link-purpose-append="Particle migration due to non-uniform laminar flow" data-link-purpose-append-open="Particle migration due to non-uniform laminar flow">Open abstract</span> </button> <a href="/article/10.1088/1873-7005/ad8516/meta" class="mr-2 mb-0 nowrap event_mini-link" data-event-action="View article"> <span class="icon-article"></span>View article<span class="offscreen-hidden">, Particle migration due to non-uniform laminar flow</span></a> <a href="/article/10.1088/1873-7005/ad8516/pdf" class="mr-2 mb-0 nowrap event_mini-link" data-event-action="PDF"><span class="icon-file-pdf"></span>PDF<span class="offscreen-hidden">, Particle migration due to non-uniform laminar flow</span></a> </div> <div class="reveal-content"> <div class="article-text view-text-small"><p>Using methods of granular mechanics in the quasi-static limit, with inter-particle interactions derived from the lubrication limit, the intensity of velocity fluctuations in the slurry is associated with fluctuations in the local distribution of inter-particle distances. These are shown to consist of a vector intensity and a scalar intensity; the former couples to the first velocity gradient, the latter (which is associated with solidosity fluctuations) couples to the second velocity gradient. Rheologies for both are presented, as is the rheology that links the particle pressure to the intensity of the velocity fluctuations (also known as the 'granular temperature') to the dispersive pressure. The rheologies are informed by experimental results. The granular temperature profile, modified from previous work, is responsible for axial particle migration (Bagnold effect). Two broad categories are assessed: symmetrical vertical and non-symmetrical lateral flow. For the latter the roughness of the boundary walls and a non-zero density contrast are important; this case is studied for a system in which flow effects are confined to the immediate vicinity of the boundary. Sensitivity analysis reveals several key variables including the parameters that control a slipping boundary condition and the mean solidosity in the conduit. For lateral flow, a sedimentary deposit with a solidosity profile may develop near the upper or lower boundary. The theory predicts an approximate relation between the fluid-particle density contrast and sediment thickness as a function of the mean flow rate, conduit width, the mean particle diameter and fluid viscosity that has utility in a range of engineering and geological situations where particulate matter is transported in the laminar flow regime.</p></div> <div class="art-list-item-tools small wd-abstr-lower"> <a class="mr-2" href="https://doi.org/10.1088/1873-7005/ad8516">https://doi.org/10.1088/1873-7005/ad8516</a> </div> </div> </div> </div> <div class="art-list-item reveal-container reveal-closed"> <div class="art-list-item-body"> <div class="eyebrow"> <span class="offscreen-hidden">The following article is </span><span class="red">Open access</span> </div> <a href="/article/10.1088/1873-7005/ad85f7" class="art-list-item-title event_main-link">Interfacial characterization of spinning water film along a concave wall</a> <p class="small art-list-item-meta"> Ardalan Javadi and Alexander Alexeev 2024 <em>Fluid Dyn. Res.</em> <b>56</b> 055509 </p> <div class="art-list-item-tools small wd-abstr-upper"> <button type="button" class="reveal-trigger mr-2 nowrap"> <svg aria-hidden="true" class="fa-icon fa-icon--left fa-icon--flip" role="img" focusable="false" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 320 512"><path d="M137.4 374.6c12.5 12.5 32.8 12.5 45.3 0l128-128c9.2-9.2 11.9-22.9 6.9-34.9s-16.6-19.8-29.6-19.8L32 192c-12.9 0-24.6 7.8-29.6 19.8s-2.2 25.7 6.9 34.9l128 128z"/></svg><span class="reveal-trigger-label" data-reveal-text="Open abstract" data-reveal-label-alt="Close abstract" data-link-purpose-append="Interfacial characterization of spinning water film along a concave wall" data-link-purpose-append-open="Interfacial characterization of spinning water film along a concave wall">Open abstract</span> </button> <a href="/article/10.1088/1873-7005/ad85f7/meta" class="mr-2 mb-0 nowrap event_mini-link" data-event-action="View article"> <span class="icon-article"></span>View article<span class="offscreen-hidden">, Interfacial characterization of spinning water film along a concave wall</span></a> <a href="/article/10.1088/1873-7005/ad85f7/pdf" class="mr-2 mb-0 nowrap event_mini-link" data-event-action="PDF"><span class="icon-file-pdf"></span>PDF<span class="offscreen-hidden">, Interfacial characterization of spinning water film along a concave wall</span></a> </div> <div class="reveal-content"> <div class="article-text view-text-small"><p>Thin liquid film flowing down the inner concave surface of a vertical cylindrical vessel is examined. At the top of the vessel, the water is injected horizontally at high speed circumferentially along the vessel wall and flows downwards due to the action of gravity. This turbulent film flow is modeled using the large eddy simulation (LES) and Reynolds averaged Navier–Stokes (RANS) approaches combined with the volume-of-fluid method. The results of both methods are validated with direct numerical simulation. The Favre-filtered two-phase LES, which is implemented and studied in this paper, can reasonably predict the film thickness similarly to that of the RANS approach using the elliptic blending Reynolds stress model, although it requires fine resolution in the wall region. The effect of volume flow rate on the film structure and thickness is investigated. The film thickness is shown to be nearly constant when the wall is partially wetted and changes as the cubic root of the volume flow rate when the spinning film encloses the entire circumference of the vessel.</p></div> <div class="art-list-item-tools small wd-abstr-lower"> <a class="mr-2" href="https://doi.org/10.1088/1873-7005/ad85f7">https://doi.org/10.1088/1873-7005/ad85f7</a> </div> </div> </div> </div> <div class="art-list-item reveal-container reveal-closed"> <div class="art-list-item-body"> <div class="eyebrow"> <span class="offscreen-hidden">The following article is </span><span class="red">Open access</span> </div> <a href="/article/10.1088/1873-7005/ad8596" class="art-list-item-title event_main-link">Construction of a numerical model for cigarette smoking and combustion and simulation of combustion cone shape</a> <p class="small art-list-item-meta"> Huaiyuan Zhu <em>et al</em> 2024 <em>Fluid Dyn. Res.</em> <b>56</b> 065501 </p> <div class="art-list-item-tools small wd-abstr-upper"> <button type="button" class="reveal-trigger mr-2 nowrap"> <svg aria-hidden="true" class="fa-icon fa-icon--left fa-icon--flip" role="img" focusable="false" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 320 512"><path d="M137.4 374.6c12.5 12.5 32.8 12.5 45.3 0l128-128c9.2-9.2 11.9-22.9 6.9-34.9s-16.6-19.8-29.6-19.8L32 192c-12.9 0-24.6 7.8-29.6 19.8s-2.2 25.7 6.9 34.9l128 128z"/></svg><span class="reveal-trigger-label" data-reveal-text="Open abstract" data-reveal-label-alt="Close abstract" data-link-purpose-append="Construction of a numerical model for cigarette smoking and combustion and simulation of combustion cone shape" data-link-purpose-append-open="Construction of a numerical model for cigarette smoking and combustion and simulation of combustion cone shape">Open abstract</span> </button> <a href="/article/10.1088/1873-7005/ad8596/meta" class="mr-2 mb-0 nowrap event_mini-link" data-event-action="View article"> <span class="icon-article"></span>View article<span class="offscreen-hidden">, Construction of a numerical model for cigarette smoking and combustion and simulation of combustion cone shape</span></a> <a href="/article/10.1088/1873-7005/ad8596/pdf" class="mr-2 mb-0 nowrap event_mini-link" data-event-action="PDF"><span class="icon-file-pdf"></span>PDF<span class="offscreen-hidden">, Construction of a numerical model for cigarette smoking and combustion and simulation of combustion cone shape</span></a> </div> <div class="reveal-content"> <div class="article-text view-text-small"><p>Understanding the thermal conditions inside a burning cigarette is a top priority for controlling chemical emissions and cigarette design. Since experimental methods are difficult to observe in depth, this paper starts from the perspective of numerical simulation and models the structure of the tobacco distribution of the cigarette, integrating the end surface ignition model, puffing model, chemical reaction model, heat and mass transfer and diffusion model have established a three-dimensional comprehensive model that can represent the changes in combustion cone morphology during cigarette combustion. The model covers chemical reaction and mass transfer as well as generation, flow and reaction mechanism. The simulation results show that the model can better predict the temperature distribution, component distribution and combustion cone morphology changes during cigarette smoking and combustion. It provides an effective means for in-depth research on cigarette combustion.</p></div> <div class="art-list-item-tools small wd-abstr-lower"> <a class="mr-2" href="https://doi.org/10.1088/1873-7005/ad8596">https://doi.org/10.1088/1873-7005/ad8596</a> </div> </div> </div> </div> <div class="art-list-item reveal-container reveal-closed"> <div class="art-list-item-body"> <div class="eyebrow"> <span class="offscreen-hidden">The following article is </span><span class="red">Open access</span> </div> <a href="/article/10.1088/1873-7005/ad6289" class="art-list-item-title event_main-link">Mean streaming in reciprocating flow in a double bifurcation</a> <p class="small art-list-item-meta"> Chandrika Wanigasekara <em>et al</em> 2024 <em>Fluid Dyn. Res.</em> <b>56</b> 045505 </p> <div class="art-list-item-tools small wd-abstr-upper"> <button type="button" class="reveal-trigger mr-2 nowrap"> <svg aria-hidden="true" class="fa-icon fa-icon--left fa-icon--flip" role="img" focusable="false" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 320 512"><path d="M137.4 374.6c12.5 12.5 32.8 12.5 45.3 0l128-128c9.2-9.2 11.9-22.9 6.9-34.9s-16.6-19.8-29.6-19.8L32 192c-12.9 0-24.6 7.8-29.6 19.8s-2.2 25.7 6.9 34.9l128 128z"/></svg><span class="reveal-trigger-label" data-reveal-text="Open abstract" data-reveal-label-alt="Close abstract" data-link-purpose-append="Mean streaming in reciprocating flow in a double bifurcation" data-link-purpose-append-open="Mean streaming in reciprocating flow in a double bifurcation">Open abstract</span> </button> <a href="/article/10.1088/1873-7005/ad6289/meta" class="mr-2 mb-0 nowrap event_mini-link" data-event-action="View article"> <span class="icon-article"></span>View article<span class="offscreen-hidden">, Mean streaming in reciprocating flow in a double bifurcation</span></a> <a href="/article/10.1088/1873-7005/ad6289/pdf" class="mr-2 mb-0 nowrap event_mini-link" data-event-action="PDF"><span class="icon-file-pdf"></span>PDF<span class="offscreen-hidden">, Mean streaming in reciprocating flow in a double bifurcation</span></a> </div> <div class="reveal-content"> <div class="article-text view-text-small"><p>This paper reports the mean streaming flow generated in a double bifurcation during reciprocating flow calculated using direct numerical simulations. Motivated by the medical ventilation technique of high-frequency ventilation (HFV), we investigate the potential for mean streaming to be maintained in this geometry as the frequency of reciprocation is increased while concurrently reducing the amplitude (and thereby reducing the volume per cycle). We identify four distinct regimes of flow. The first and second occur at low to moderate frequencies and generate significant streaming flows due to the interaction between Dean vortices that are generated during both the in- and out-flows. The third and fourth occur at high frequencies and produce reduced streaming, due to the reduction in formation length of the Dean vortices. Notably, the fourth regime at the highest frequencies investigated appears to show a switch in the direction of the streaming flow at the wall. Considering the motivating application of HFV, we show that currently employed frequencies are low, and much higher frequencies (and subsequently lower volumes per cycle) could potentially be employed.</p></div> <div class="art-list-item-tools small wd-abstr-lower"> <a class="mr-2" href="https://doi.org/10.1088/1873-7005/ad6289">https://doi.org/10.1088/1873-7005/ad6289</a> </div> </div> </div> </div> <div class="art-list-item reveal-container reveal-closed"> <div class="art-list-item-body"> <div class="eyebrow"> <span class="offscreen-hidden">The following article is </span><span class="red">Open access</span> </div> <a href="/article/10.1088/1873-7005/ad7aa0" class="art-list-item-title event_main-link">The effect of asymmetry on the absolute instability of confined jets and wakes</a> <p class="small art-list-item-meta"> Ryan Poole and M R Turner 2024 <em>Fluid Dyn. Res.</em> <b>56</b> 055504 </p> <div class="art-list-item-tools small wd-abstr-upper"> <button type="button" class="reveal-trigger mr-2 nowrap"> <svg aria-hidden="true" class="fa-icon fa-icon--left fa-icon--flip" role="img" focusable="false" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 320 512"><path d="M137.4 374.6c12.5 12.5 32.8 12.5 45.3 0l128-128c9.2-9.2 11.9-22.9 6.9-34.9s-16.6-19.8-29.6-19.8L32 192c-12.9 0-24.6 7.8-29.6 19.8s-2.2 25.7 6.9 34.9l128 128z"/></svg><span class="reveal-trigger-label" data-reveal-text="Open abstract" data-reveal-label-alt="Close abstract" data-link-purpose-append="The effect of asymmetry on the absolute instability of confined jets and wakes" data-link-purpose-append-open="The effect of asymmetry on the absolute instability of confined jets and wakes">Open abstract</span> </button> <a href="/article/10.1088/1873-7005/ad7aa0/meta" class="mr-2 mb-0 nowrap event_mini-link" data-event-action="View article"> <span class="icon-article"></span>View article<span class="offscreen-hidden">, The effect of asymmetry on the absolute instability of confined jets and wakes</span></a> <a href="/article/10.1088/1873-7005/ad7aa0/pdf" class="mr-2 mb-0 nowrap event_mini-link" data-event-action="PDF"><span class="icon-file-pdf"></span>PDF<span class="offscreen-hidden">, The effect of asymmetry on the absolute instability of confined jets and wakes</span></a> </div> <div class="reveal-content"> <div class="article-text view-text-small"><p>Jets and wakes are fundamental fluid flows that arise in a wide range of environmental and aerospace applications. They are typically studied as open systems. Here we are interested in the implications of placing the jet or wake inside of another system, as well as the implications of compliant walls. In particular, the effect of asymmetry is considered on the absolute instability properties for this internal flow, when it is transversely confined by compliant walls. Two distinct cases are considered, namely the case of two compliant walls with non-identical wall parameters and the case of identical compliant walls asymmetrically located about the fluid center line. The absolute instability characteristics are identified by following special saddle points (pinch points) of the dispersion relation in the complex wavenumber plane, and the flow's stability properties are mapped out using parameter continuation techniques. The compliant walls introduce new modes which typically dominate the stability properties of the flow, in comparison to the case of pure shear layers. In the case of symmetrically located walls with non-identical wall parameters, it was found that the absolute stability properties are dominated by the modes linked to the more flexible of the two walls. In the case of identical walls asymmetrically confining the flow, it was found that these flows exhibit smaller regions of absolute instability in parameter space, when compared to the symmetric flow configuration.</p></div> <div class="art-list-item-tools small wd-abstr-lower"> <a class="mr-2" href="https://doi.org/10.1088/1873-7005/ad7aa0">https://doi.org/10.1088/1873-7005/ad7aa0</a> </div> </div> </div> </div> <div class="art-list-item reveal-container reveal-closed"> <div class="art-list-item-body"> <a href="/article/10.1016/0169-5983(94)00019-V" class="art-list-item-title event_main-link">Note on multiple-frequency forcing on mixing layers</a> <p class="small art-list-item-meta"> Osamu Inoue 1995 <em>Fluid Dyn. Res.</em> <b>16</b> 161 </p> <div class="art-list-item-tools small wd-abstr-upper"> <button type="button" class="reveal-trigger mr-2 nowrap"> <svg aria-hidden="true" class="fa-icon fa-icon--left fa-icon--flip" role="img" focusable="false" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 320 512"><path d="M137.4 374.6c12.5 12.5 32.8 12.5 45.3 0l128-128c9.2-9.2 11.9-22.9 6.9-34.9s-16.6-19.8-29.6-19.8L32 192c-12.9 0-24.6 7.8-29.6 19.8s-2.2 25.7 6.9 34.9l128 128z"/></svg><span class="reveal-trigger-label" data-reveal-text="Open abstract" data-reveal-label-alt="Close abstract" data-link-purpose-append="Note on multiple-frequency forcing on mixing layers" data-link-purpose-append-open="Note on multiple-frequency forcing on mixing layers">Open abstract</span> </button> <a href="/article/10.1016/0169-5983(94)00019-V/meta" class="mr-2 mb-0 nowrap event_mini-link" data-event-action="View article"> <span class="icon-article"></span>View article<span class="offscreen-hidden">, Note on multiple-frequency forcing on mixing layers</span></a> <a href="/article/10.1016/0169-5983(94)00019-V/pdf" class="mr-2 mb-0 nowrap event_mini-link" data-event-action="PDF"><span class="icon-file-pdf"></span>PDF<span class="offscreen-hidden">, Note on multiple-frequency forcing on mixing layers</span></a> </div> <div class="reveal-content"> <div class="article-text view-text-small"><p>The effect of triple-frequency forcing on the development of a two-dimensional spatially-growing mixing layer is studied numerically by a vortex method. Forcing is prescribed as a superposition of a fundamental frequency with its sub-harmonic frequencies. Results show that triple-frequency forcing as well as double-frequency forcing are effective to control the number of merging vortices, patterns of vortex merging, streamwise locations where regular vortex merging starts, and thus mixing layer growth if forcing frequencies, phase shifts and forcing amplitudes are suitably selected.</p></div> <div class="art-list-item-tools small wd-abstr-lower"> <a class="mr-2" href="https://doi.org/10.1016/0169-5983(94)00019-V">https://doi.org/10.1016/0169-5983(94)00019-V</a> </div> </div> </div> </div> <div class="art-list-item reveal-container reveal-closed"> <div class="art-list-item-body"> <div class="eyebrow"> <span class="offscreen-hidden">The following article is </span><span class="red">Open access</span> </div> <a href="/article/10.1088/1873-7005/ad716a" class="art-list-item-title event_main-link">Mode analysis for multiple parameter conditions of nozzle internal unsteady flow using Parametric Global Proper Orthogonal Decomposition</a> <p class="small art-list-item-meta"> Mikimasa Kawaguchi <em>et al</em> 2024 <em>Fluid Dyn. Res.</em> <b>56</b> 055501 </p> <div class="art-list-item-tools small wd-abstr-upper"> <button type="button" class="reveal-trigger mr-2 nowrap"> <svg aria-hidden="true" class="fa-icon fa-icon--left fa-icon--flip" role="img" focusable="false" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 320 512"><path d="M137.4 374.6c12.5 12.5 32.8 12.5 45.3 0l128-128c9.2-9.2 11.9-22.9 6.9-34.9s-16.6-19.8-29.6-19.8L32 192c-12.9 0-24.6 7.8-29.6 19.8s-2.2 25.7 6.9 34.9l128 128z"/></svg><span class="reveal-trigger-label" data-reveal-text="Open abstract" data-reveal-label-alt="Close abstract" data-link-purpose-append="Mode analysis for multiple parameter conditions of nozzle internal unsteady flow using Parametric Global Proper Orthogonal Decomposition" data-link-purpose-append-open="Mode analysis for multiple parameter conditions of nozzle internal unsteady flow using Parametric Global Proper Orthogonal Decomposition">Open abstract</span> </button> <a href="/article/10.1088/1873-7005/ad716a/meta" class="mr-2 mb-0 nowrap event_mini-link" data-event-action="View article"> <span class="icon-article"></span>View article<span class="offscreen-hidden">, Mode analysis for multiple parameter conditions of nozzle internal unsteady flow using Parametric Global Proper Orthogonal Decomposition</span></a> <a href="/article/10.1088/1873-7005/ad716a/pdf" class="mr-2 mb-0 nowrap event_mini-link" data-event-action="PDF"><span class="icon-file-pdf"></span>PDF<span class="offscreen-hidden">, Mode analysis for multiple parameter conditions of nozzle internal unsteady flow using Parametric Global Proper Orthogonal Decomposition</span></a> </div> <div class="reveal-content"> <div class="article-text view-text-small"><p>Analysis methods based on mode decomposition have been proposed to describe the characteristics of flow phenomena. Among them, proper orthogonal decomposition (POD), which decomposes modes into eigenvalues and basis vectors, has long been used. Many studies have shown that POD is a useful method for capturing the characteristics of unsteady flow. In particular, Snapshot POD has attracted much recent attention and has been used to solve unsteady flow problems. However, the basis vectors of the mode obtained by conventional POD is different for each condition. Therefore, whether the basis vectors of each mode are switching in the direction of parameters (e.g. different shapes or different Reynolds numbers) or whether they develop or decay is difficult to discuss. As a result, discussions on conventional POD tend to be qualitative. To address this issue, the present study uses Parametric Global POD, a method that perfectly matches basis vectors in results with different parameters (in this study, different Reynolds numbers). Parametric Global POD method was applied to the analysis of the flow field in a curved pipe and found to capture the development or decay of modes with major basis vectors in the direction of parameters, which is difficult to achieve with conventional POD methods.</p></div> <div class="art-list-item-tools small wd-abstr-lower"> <a class="mr-2" href="https://doi.org/10.1088/1873-7005/ad716a">https://doi.org/10.1088/1873-7005/ad716a</a> </div> </div> </div> </div> <div class="art-list-item reveal-container reveal-closed"> <div class="art-list-item-body"> <div class="eyebrow"> <span class="offscreen-hidden">The following article is </span><span class="red">Open access</span> </div> <a href="/article/10.1088/1873-7005/ad5375" class="art-list-item-title event_main-link">Large-scale vortex formation in three-dimensional rotating Rayleigh-Bénard convection</a> <p class="small art-list-item-meta"> Hirofumi Sasaki <em>et al</em> 2024 <em>Fluid Dyn. Res.</em> <b>56</b> 035504 </p> <div class="art-list-item-tools small wd-abstr-upper"> <button type="button" class="reveal-trigger mr-2 nowrap"> <svg aria-hidden="true" class="fa-icon fa-icon--left fa-icon--flip" role="img" focusable="false" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 320 512"><path d="M137.4 374.6c12.5 12.5 32.8 12.5 45.3 0l128-128c9.2-9.2 11.9-22.9 6.9-34.9s-16.6-19.8-29.6-19.8L32 192c-12.9 0-24.6 7.8-29.6 19.8s-2.2 25.7 6.9 34.9l128 128z"/></svg><span class="reveal-trigger-label" data-reveal-text="Open abstract" data-reveal-label-alt="Close abstract" data-link-purpose-append="Large-scale vortex formation in three-dimensional rotating Rayleigh-Bénard convection" data-link-purpose-append-open="Large-scale vortex formation in three-dimensional rotating Rayleigh-Bénard convection">Open abstract</span> </button> <a href="/article/10.1088/1873-7005/ad5375/meta" class="mr-2 mb-0 nowrap event_mini-link" data-event-action="View article"> <span class="icon-article"></span>View article<span class="offscreen-hidden">, Large-scale vortex formation in three-dimensional rotating Rayleigh-Bénard convection</span></a> <a href="/article/10.1088/1873-7005/ad5375/pdf" class="mr-2 mb-0 nowrap event_mini-link" data-event-action="PDF"><span class="icon-file-pdf"></span>PDF<span class="offscreen-hidden">, Large-scale vortex formation in three-dimensional rotating Rayleigh-Bénard convection</span></a> </div> <div class="reveal-content"> <div class="article-text view-text-small"><p>Numerical experiments are performed on three-dimensional thermal convection between parallel plates in a rotating system with a larger horizontal region than in previous studies. It is confirmed that a large-scale vortex (LSV) with positive vorticity (cyclonic) is formed over a significant part of the region and its horizontal size increases if the horizontal region is extended. The correlation analysis in the vertical direction shows that the small-scale motion has a typical structure of the baroclinic vortex of thermal convection in the rotating system, whereas the large-scale motion is a barotropic vortex that is not associated with thermal convection. A horizontal spectral analysis of the individual terms in the kinetic energy equation reveals that the nonlinear effect of the small-scale vortex motion caused by the buoyancy force induces a large-scale toroidal component, and that the LSV is maintained by the balance between the nonlinear effect and the viscous dissipation of the large-scale motion. The results of this analysis indicate the importance of kinetic energy damping mechanism for the appearance of LSVs. When weak damping operates at larger scales, it is expected that the maximum extent of the vortex appears even if the horizontal region is extended further. On the other hand, the emergence of LSVs will be prevented when strong enough damping is effective at larger scales.</p></div> <div class="art-list-item-tools small wd-abstr-lower"> <a class="mr-2" href="https://doi.org/10.1088/1873-7005/ad5375">https://doi.org/10.1088/1873-7005/ad5375</a> </div> </div> </div> </div> <div class="art-list-item reveal-container reveal-closed"> <div class="art-list-item-body"> <div class="eyebrow"> <span class="offscreen-hidden">The following article is </span><span class="red">Open access</span> </div> <a href="/article/10.1088/1873-7005/ad5abc" class="art-list-item-title event_main-link">Bayesian parameter estimation and evaluation of the <i>K-</i>ω shear stress transport model for plane impinging jets</a> <p class="small art-list-item-meta"> M L Lanahan <em>et al</em> 2024 <em>Fluid Dyn. Res.</em> <b>56</b> 041401 </p> <div class="art-list-item-tools small wd-abstr-upper"> <button type="button" class="reveal-trigger mr-2 nowrap"> <svg aria-hidden="true" class="fa-icon fa-icon--left fa-icon--flip" role="img" focusable="false" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 320 512"><path d="M137.4 374.6c12.5 12.5 32.8 12.5 45.3 0l128-128c9.2-9.2 11.9-22.9 6.9-34.9s-16.6-19.8-29.6-19.8L32 192c-12.9 0-24.6 7.8-29.6 19.8s-2.2 25.7 6.9 34.9l128 128z"/></svg><span class="reveal-trigger-label" data-reveal-text="Open abstract" data-reveal-label-alt="Close abstract" data-link-purpose-append="Bayesian parameter estimation and evaluation of the K-ω shear stress transport model for plane impinging jets" data-link-purpose-append-open="Bayesian parameter estimation and evaluation of the K-ω shear stress transport model for plane impinging jets">Open abstract</span> </button> <a href="/article/10.1088/1873-7005/ad5abc/meta" class="mr-2 mb-0 nowrap event_mini-link" data-event-action="View article"> <span class="icon-article"></span>View article<span class="offscreen-hidden">, Bayesian parameter estimation and evaluation of the K-ω shear stress transport model for plane impinging jets</span></a> <a href="/article/10.1088/1873-7005/ad5abc/pdf" class="mr-2 mb-0 nowrap event_mini-link" data-event-action="PDF"><span class="icon-file-pdf"></span>PDF<span class="offscreen-hidden">, Bayesian parameter estimation and evaluation of the K-ω shear stress transport model for plane impinging jets</span></a> </div> <div class="reveal-content"> <div class="article-text view-text-small"><p>Numerical simulations with semi-empirical turbulence models are commonly used to model impinging jets, often used for cooling solid surfaces. In this work, the constants in the <i>k-ω</i> shear stress transport model in ANSYS FLUENT are calibrated to experimental velocity and heat transfer data for a plane turbulent impinging air jet to determine if Kennedy-O'Hagan calibration (Kennedy and O'Hagan 2001 <i>J. R. Stat. Soc.</i> B <b>63</b> 425–64) can improve predictions of near-surface velocities and surface Nusselt numbers for similar flows. Impinging jets have been proposed to cool the target plates of the divertor in future magnetic fusion energy reactors, where simulations are used to estimate divertor performance. The flat-plate divertor (Wang <i>et al</i> 2009 <i>Fusion Sci. Technol.</i><b>56</b> 1023–7) uses a plane jet of helium issuing from a <i>B</i> = 0.5 mm slot to cool a surface with radius of curvature of 44<i>B</i> at a distance 4<i>B</i> from the slot. Predictions from the calibrated numerical model are compared with independent experimental data at different flow conditions, as well as surface temperature data for a flat plate divertor test section. The contribution of this work is evaluation of the accuracy of a calibrated turbulence model for modest extrapolations in flow geometry and flow conditions for a plane impinging jet.</p></div> <div class="art-list-item-tools small wd-abstr-lower"> <a class="mr-2" href="https://doi.org/10.1088/1873-7005/ad5abc">https://doi.org/10.1088/1873-7005/ad5abc</a> </div> </div> </div> </div> <div class="art-list-item reveal-container reveal-closed"> <div class="art-list-item-body"> <div class="eyebrow"> <span class="offscreen-hidden">The following article is </span><span class="red">Open access</span> </div> <a href="/article/10.1088/1873-7005/ad220c" class="art-list-item-title event_main-link">Transient slow motion of a porous sphere</a> <p class="small art-list-item-meta"> Chan W Yu and Huan J Keh 2024 <em>Fluid Dyn. Res.</em> <b>56</b> 015503 </p> <div class="art-list-item-tools small wd-abstr-upper"> <button type="button" class="reveal-trigger mr-2 nowrap"> <svg aria-hidden="true" class="fa-icon fa-icon--left fa-icon--flip" role="img" focusable="false" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 320 512"><path d="M137.4 374.6c12.5 12.5 32.8 12.5 45.3 0l128-128c9.2-9.2 11.9-22.9 6.9-34.9s-16.6-19.8-29.6-19.8L32 192c-12.9 0-24.6 7.8-29.6 19.8s-2.2 25.7 6.9 34.9l128 128z"/></svg><span class="reveal-trigger-label" data-reveal-text="Open abstract" data-reveal-label-alt="Close abstract" data-link-purpose-append="Transient slow motion of a porous sphere" data-link-purpose-append-open="Transient slow motion of a porous sphere">Open abstract</span> </button> <a href="/article/10.1088/1873-7005/ad220c/meta" class="mr-2 mb-0 nowrap event_mini-link" data-event-action="View article"> <span class="icon-article"></span>View article<span class="offscreen-hidden">, Transient slow motion of a porous sphere</span></a> <a href="/article/10.1088/1873-7005/ad220c/pdf" class="mr-2 mb-0 nowrap event_mini-link" data-event-action="PDF"><span class="icon-file-pdf"></span>PDF<span class="offscreen-hidden">, Transient slow motion of a porous sphere</span></a> </div> <div class="reveal-content"> <div class="article-text view-text-small"><p>The start-up creeping motion of a porous spherical particle, which models a permeable polymer coil or floc of nanoparticles, in an incompressible Newtonian fluid generated by the sudden application of a body force is investigated for the first time. The transient Stokes and Brinkman equations governing the fluid velocities outside and inside the porous sphere, respectively, are solved by using the Laplace transform. An analytical formula for the transient velocity of the particle as a function of relevant parameters is obtained. As expected, the particle velocity increases over time, and a particle with greater mass density lags behind a corresponding less dense particle in the growth of the particle velocity. In general, the transient velocity is an increasing function of the porosity of the particle. On the other hand, a porous particle with a higher fluid permeability will have a greater transient velocity than the same particle with a lower permeability, but may trail behind the less permeable particle in the percentage growth of the velocity. The acceleration of the porous particle is a monotonic decreasing function of the elapsed time and a monotonic increasing function of its fluid permeability. In particular, the transient behavior of creeping motions of porous particles may be much more important than that of impermeable particles.</p></div> <div class="art-list-item-tools small wd-abstr-lower"> <a class="mr-2" href="https://doi.org/10.1088/1873-7005/ad220c">https://doi.org/10.1088/1873-7005/ad220c</a> </div> </div> </div> </div> </div>  </div> </div> </div>   <div tabindex="0" role="tabpanel" id="latest-articles-tab" aria-labelledby="latest-articles"> <div class=" reveal-container reveal-closed reveal-enabled reveal-container--jnl-tab"> <h2 class="tabpanel__title"> <button type="button" class="reveal-trigger event_tabs-accordion" aria-expanded="false"> <svg aria-hidden="true" class="fa-icon fa-icon--left fa-icon--flip" role="img" focusable="false" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 320 512"><path d="M137.4 374.6c12.5 12.5 32.8 12.5 45.3 0l128-128c9.2-9.2 11.9-22.9 6.9-34.9s-16.6-19.8-29.6-19.8L32 192c-12.9 0-24.6 7.8-29.6 19.8s-2.2 25.7 6.9 34.9l128 128z"/></svg>Latest articles</button> </h2> <div class="reveal-content tabpanel__content" style="display: none"> <p> <button data-reveal-label-alt="Close all abstracts" class="reveal-all-trigger mr-2 small" data-reveal-text="Open all abstracts" data-link-purpose-append="in this tab" data-link-purpose-append-open="in this tab"> Open all abstracts<span class="offscreen-hidden">, in this tab</span> </button> </p>  <div class="art-list"> <div class="art-list-item reveal-container reveal-closed"> <div class="art-list-item-body"> <div class="eyebrow"> <span class="offscreen-hidden">The following article is </span><span class="red">Open access</span> </div> <a href="/article/10.1088/1873-7005/ad8d08" class="art-list-item-title event_main-link">An integrated stairwise adaptive finite point scheme for the two-dimensional coupled Burgers' equation</a> <p class="small art-list-item-meta"> A Sreelakshmi <em>et al</em> 2024 <em>Fluid Dyn. Res.</em> <b>56</b> 065505 </p> <div class="art-list-item-tools small wd-abstr-upper"> <button type="button" class="reveal-trigger mr-2 nowrap"> <svg aria-hidden="true" class="fa-icon fa-icon--left fa-icon--flip" role="img" focusable="false" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 320 512"><path d="M137.4 374.6c12.5 12.5 32.8 12.5 45.3 0l128-128c9.2-9.2 11.9-22.9 6.9-34.9s-16.6-19.8-29.6-19.8L32 192c-12.9 0-24.6 7.8-29.6 19.8s-2.2 25.7 6.9 34.9l128 128z"/></svg><span class="reveal-trigger-label" data-reveal-text="Open abstract" data-reveal-label-alt="Close abstract" data-link-purpose-append="An integrated stairwise adaptive finite point scheme for the two-dimensional coupled Burgers’ equation" data-link-purpose-append-open="An integrated stairwise adaptive finite point scheme for the two-dimensional coupled Burgers’ equation">Open abstract</span> </button> <a href="/article/10.1088/1873-7005/ad8d08/meta" class="mr-2 mb-0 nowrap event_mini-link" data-event-action="View article"> <span class="icon-article"></span>View article<span class="offscreen-hidden">, An integrated stairwise adaptive finite point scheme for the two-dimensional coupled Burgers' equation</span></a> <a href="/article/10.1088/1873-7005/ad8d08/pdf" class="mr-2 mb-0 nowrap event_mini-link" data-event-action="PDF"><span class="icon-file-pdf"></span>PDF<span class="offscreen-hidden">, An integrated stairwise adaptive finite point scheme for the two-dimensional coupled Burgers' equation</span></a> </div> <div class="reveal-content"> <div class="article-text view-text-small"><p>This paper explores the potential of a streamlined adaptive finite point method (FPM) in tackling two-dimensional coupled Burgers' equations, employing them as a testbed for further advancements. Firstly the coupled system is transformed into a two-dimensional heat equation through Cole–Hopf transformation and then this transformed equation is split into one-dimensional heat equations at intermediate temporal levels along X and Y directions and these one-dimensional equations are finally to be treated with the adaptive FPM. The distinctive feature of the adaptive FPM used here lies in employing an implicit 4-point stencil within each local cell to compute the solution at a higher temporal level through a linear combination of solutions from the preceding temporal level. The coefficients involved in this linear combination are derived via the local fundamental solutions within that cell, thereby imbuing the formulations with the intrinsic essence of the exact solution. Moreover, the separation constant utilized is tailored to consistently integrate the influence of the initial solution, independent of the temporal level. The method's theoretical underpinnings ensure its conditionally stable, consistent, and convergent behavior. The accuracy of the scheme is substantiated by its proficient handling of diverse examples, attesting to its superior cost-effectiveness and time efficiency.</p></div> <div class="art-list-item-tools small wd-abstr-lower"> <a class="mr-2" href="https://doi.org/10.1088/1873-7005/ad8d08">https://doi.org/10.1088/1873-7005/ad8d08</a> </div> </div> </div> </div> <div class="art-list-item reveal-container reveal-closed"> <div class="art-list-item-body"> <a href="/article/10.1088/1873-7005/ad917c" class="art-list-item-title event_main-link">Predictive model and optimization of micromixers geometry using Gaussian process with uncertainty quantification and genetic algorithm</a> <p class="small art-list-item-meta"> Daniela de Oliveira Maionchi <em>et al</em> 2024 <em>Fluid Dyn. Res.</em> <b>56</b> 065504 </p> <div class="art-list-item-tools small wd-abstr-upper"> <button type="button" class="reveal-trigger mr-2 nowrap"> <svg aria-hidden="true" class="fa-icon fa-icon--left fa-icon--flip" role="img" focusable="false" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 320 512"><path d="M137.4 374.6c12.5 12.5 32.8 12.5 45.3 0l128-128c9.2-9.2 11.9-22.9 6.9-34.9s-16.6-19.8-29.6-19.8L32 192c-12.9 0-24.6 7.8-29.6 19.8s-2.2 25.7 6.9 34.9l128 128z"/></svg><span class="reveal-trigger-label" data-reveal-text="Open abstract" data-reveal-label-alt="Close abstract" data-link-purpose-append="Predictive model and optimization of micromixers geometry using Gaussian process with uncertainty quantification and genetic algorithm" data-link-purpose-append-open="Predictive model and optimization of micromixers geometry using Gaussian process with uncertainty quantification and genetic algorithm">Open abstract</span> </button> <a href="/article/10.1088/1873-7005/ad917c/meta" class="mr-2 mb-0 nowrap event_mini-link" data-event-action="View article"> <span class="icon-article"></span>View article<span class="offscreen-hidden">, Predictive model and optimization of micromixers geometry using Gaussian process with uncertainty quantification and genetic algorithm</span></a> <a href="/article/10.1088/1873-7005/ad917c/pdf" class="mr-2 mb-0 nowrap event_mini-link" data-event-action="PDF"><span class="icon-file-pdf"></span>PDF<span class="offscreen-hidden">, Predictive model and optimization of micromixers geometry using Gaussian process with uncertainty quantification and genetic algorithm</span></a> </div> <div class="reveal-content"> <div class="article-text view-text-small"><p>Microfluidic devices are increasingly valuable for their compact size and ability to handle tiny fluid volumes, making efficient mixing at this scale (micromixing) a critical focus. This research aims to optimize micromixer geometries to improve mixing efficiency while controlling pressure drop, providing a method that balances performance and computational cost. Building on previous work, we introduce a novel optimization framework in microfluidics combining computational fluid dynamics (CFD) and machine learning (ML) techniques, particularly Gaussian process (GP) modeling with Genetic Algorithm (GA) optimization. Inspired by a Y-type micromixer design with cylindrical grooves on the main channel's surface and internal obstructions, our study examines the impact of circular obstructions on mixing percentage and pressure drop under varying obstruction diameter and offset. Simulations conducted using OpenFOAM software generate data for a reduced-order GP model, which provides model uncertainty. The geometry is then optimized using the GA algorithm on the reduced model. Results indicate that medium-sized obstructions (137 mm diameter, 10 mm offset) near the channel wall achieve optimal mixing and pressure performance, closely aligning with previous studies. The uncertainties, recorded as 3.9% and 21.5% for mixing percentage and pressure drop, respectively, further validate the robustness of our model. This study highlights an effective, uncertainty-quantified optimization process that leverages CFD and ML integration, setting a foundation for efficient microfluidic design strategies.</p></div> <div class="art-list-item-tools small wd-abstr-lower"> <a class="mr-2" href="https://doi.org/10.1088/1873-7005/ad917c">https://doi.org/10.1088/1873-7005/ad917c</a> </div> </div> </div> </div> <div class="art-list-item reveal-container reveal-closed"> <div class="art-list-item-body"> <a href="/article/10.1088/1873-7005/ad8d09" class="art-list-item-title event_main-link">Implementation of spectral methods on Ising machines: toward flow simulations on quantum annealers</a> <p class="small art-list-item-meta"> Kenichiro Takagi <em>et al</em> 2024 <em>Fluid Dyn. Res.</em> <b>56</b> 061401 </p> <div class="art-list-item-tools small wd-abstr-upper"> <button type="button" class="reveal-trigger mr-2 nowrap"> <svg aria-hidden="true" class="fa-icon fa-icon--left fa-icon--flip" role="img" focusable="false" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 320 512"><path d="M137.4 374.6c12.5 12.5 32.8 12.5 45.3 0l128-128c9.2-9.2 11.9-22.9 6.9-34.9s-16.6-19.8-29.6-19.8L32 192c-12.9 0-24.6 7.8-29.6 19.8s-2.2 25.7 6.9 34.9l128 128z"/></svg><span class="reveal-trigger-label" data-reveal-text="Open abstract" data-reveal-label-alt="Close abstract" data-link-purpose-append="Implementation of spectral methods on Ising machines: toward flow simulations on quantum annealers" data-link-purpose-append-open="Implementation of spectral methods on Ising machines: toward flow simulations on quantum annealers">Open abstract</span> </button> <a href="/article/10.1088/1873-7005/ad8d09/meta" class="mr-2 mb-0 nowrap event_mini-link" data-event-action="View article"> <span class="icon-article"></span>View article<span class="offscreen-hidden">, Implementation of spectral methods on Ising machines: toward flow simulations on quantum annealers</span></a> <a href="/article/10.1088/1873-7005/ad8d09/pdf" class="mr-2 mb-0 nowrap event_mini-link" data-event-action="PDF"><span class="icon-file-pdf"></span>PDF<span class="offscreen-hidden">, Implementation of spectral methods on Ising machines: toward flow simulations on quantum annealers</span></a> </div> <div class="reveal-content"> <div class="article-text view-text-small"><p>We investigate the possibility and current limitations of flow computations using quantum annealers by solving a fundamental flow problem on Ising machines. As a fundamental problem, we consider the one-dimensional advection–diffusion equation. We formulate it in a form suited to Ising machines (i.e. both classical and quantum annealers), perform extensive numerical tests on a classical annealer, and finally test it on an actual quantum annealer. To make it possible to process with an Ising machine, the problem is formulated as a minimization problem of the residual of the governing equation discretized using either the spectral method or the finite difference method. The resulting system equation is then converted to the quadratic unconstrained binary optimization (QUBO) form through the quantization of variables. It is found in numerical tests using a classical annealer that the spectral method requiring a smaller number of variables has a particular merit over the finite difference method because the accuracy deteriorates with the increase of the number of variables. We also found that the computational error varies depending on the condition number of the coefficient matrix. In addition, we extended it to a two-dimensional problem and confirmed its fundamental applicability. From the numerical test using a quantum annealer, however, it turns out that the computation using a quantum annealer is still challenging due largely to the structural difference from the classical annealer, which leaves a number of issues toward its practical use.</p></div> <div class="art-list-item-tools small wd-abstr-lower"> <a class="mr-2" href="https://doi.org/10.1088/1873-7005/ad8d09">https://doi.org/10.1088/1873-7005/ad8d09</a> </div> </div> </div> </div> <div class="art-list-item reveal-container reveal-closed"> <div class="art-list-item-body"> <a href="/article/10.1088/1873-7005/ad8b67" class="art-list-item-title event_main-link">Analytical simulation of Darcy–Forchheimer nanofluid flow over a curved expanding permeable surface</a> <p class="small art-list-item-meta"> Ali Rehman <em>et al</em> 2024 <em>Fluid Dyn. Res.</em> <b>56</b> 065503 </p> <div class="art-list-item-tools small wd-abstr-upper"> <button type="button" class="reveal-trigger mr-2 nowrap"> <svg aria-hidden="true" class="fa-icon fa-icon--left fa-icon--flip" role="img" focusable="false" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 320 512"><path d="M137.4 374.6c12.5 12.5 32.8 12.5 45.3 0l128-128c9.2-9.2 11.9-22.9 6.9-34.9s-16.6-19.8-29.6-19.8L32 192c-12.9 0-24.6 7.8-29.6 19.8s-2.2 25.7 6.9 34.9l128 128z"/></svg><span class="reveal-trigger-label" data-reveal-text="Open abstract" data-reveal-label-alt="Close abstract" data-link-purpose-append="Analytical simulation of Darcy–Forchheimer nanofluid flow over a curved expanding permeable surface" data-link-purpose-append-open="Analytical simulation of Darcy–Forchheimer nanofluid flow over a curved expanding permeable surface">Open abstract</span> </button> <a href="/article/10.1088/1873-7005/ad8b67/meta" class="mr-2 mb-0 nowrap event_mini-link" data-event-action="View article"> <span class="icon-article"></span>View article<span class="offscreen-hidden">, Analytical simulation of Darcy–Forchheimer nanofluid flow over a curved expanding permeable surface</span></a> <a href="/article/10.1088/1873-7005/ad8b67/pdf" class="mr-2 mb-0 nowrap event_mini-link" data-event-action="PDF"><span class="icon-file-pdf"></span>PDF<span class="offscreen-hidden">, Analytical simulation of Darcy–Forchheimer nanofluid flow over a curved expanding permeable surface</span></a> </div> <div class="reveal-content"> <div class="article-text view-text-small"><p>This research paper presents an analytical simulation of Darcy–Forchheimer flow over a porous curve stretching surface. In fluid dynamics, the Darcy–Forchheimer model combines Forchheimer adjustment and high-velocity effects with Darcy's formula for porous media flow: two nanofluid particles, molybdenum disulphide, and graphene oxide, form nanofluid with the base fluid blood. The governing partial differential equations for momentum and energy are converted into a nonlinear ordinary differential equations system by applying the appropriate similarity transformations. The homotopy analysis method is used to solve the transform equations analytically. The impact of essential factors includes the Forchheimer parameter, porosity parameter, slip parameter, Eckert number, nanoparticle volume friction, magnetic field parameter, and curvature parameter. The results have applications in the design of sophisticated cooling systems, where effective thermal control is essential.</p></div> <div class="art-list-item-tools small wd-abstr-lower"> <a class="mr-2" href="https://doi.org/10.1088/1873-7005/ad8b67">https://doi.org/10.1088/1873-7005/ad8b67</a> </div> </div> </div> </div> <div class="art-list-item reveal-container reveal-closed"> <div class="art-list-item-body"> <a href="/article/10.1088/1873-7005/ad8b66" class="art-list-item-title event_main-link">Influence of interface on nondeformable micropolar drop migration</a> <p class="small art-list-item-meta"> Ahmed G Salem 2024 <em>Fluid Dyn. Res.</em> <b>56</b> 065502 </p> <div class="art-list-item-tools small wd-abstr-upper"> <button type="button" class="reveal-trigger mr-2 nowrap"> <svg aria-hidden="true" class="fa-icon fa-icon--left fa-icon--flip" role="img" focusable="false" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 320 512"><path d="M137.4 374.6c12.5 12.5 32.8 12.5 45.3 0l128-128c9.2-9.2 11.9-22.9 6.9-34.9s-16.6-19.8-29.6-19.8L32 192c-12.9 0-24.6 7.8-29.6 19.8s-2.2 25.7 6.9 34.9l128 128z"/></svg><span class="reveal-trigger-label" data-reveal-text="Open abstract" data-reveal-label-alt="Close abstract" data-link-purpose-append="Influence of interface on nondeformable micropolar drop migration" data-link-purpose-append-open="Influence of interface on nondeformable micropolar drop migration">Open abstract</span> </button> <a href="/article/10.1088/1873-7005/ad8b66/meta" class="mr-2 mb-0 nowrap event_mini-link" data-event-action="View article"> <span class="icon-article"></span>View article<span class="offscreen-hidden">, Influence of interface on nondeformable micropolar drop migration</span></a> <a href="/article/10.1088/1873-7005/ad8b66/pdf" class="mr-2 mb-0 nowrap event_mini-link" data-event-action="PDF"><span class="icon-file-pdf"></span>PDF<span class="offscreen-hidden">, Influence of interface on nondeformable micropolar drop migration</span></a> </div> <div class="reveal-content"> <div class="article-text view-text-small"><p>In this article, an analytical approach is considered to study the issue of specifying Stokesian motion due to a micropolar sphere drop translating at a concentric instantaneous position within a spherical fluid–fluid interface that divides two immiscible fluids, one of which is bounded and the other is unbounded. Here, the focus is on the situation where there are two microstructure-related fluid phases (micropolar fluids) out of the three. The motion is considered to have low Reynolds numbers; thus, the drop's surface and fluid–fluid interface have insignificant deformation. General solutions to the slow axisymmetric motion of the micropolar/viscous fluid in a spherical coordinate system are obtained based on a concentric position. Boundary conditions are fulfilled at the drop's surface and the fluid–fluid interface. Findings indicate that the normalised hydrodynamic force increases monotonically as the droplet-to-interface radius ratio increases, acting on a moving micropolar sphere droplet and becoming unlimited when the drop's surface touches the fluid–fluid interface. The numerical findings for the normalised force operating on the micropolar sphere droplet at different values of the suitable parameters are introduced in both graphical and tabular form. Our numerical findings are compared with the suitable data for the special cases stated in the literature. The current investigation of the study has practical applications in many domains of industrial, biological, medicinal, and natural processes, for example, liquid crystals, polymeric suspensions, muddy fluids, liquid–liquid extraction, raindrop formation, blood cells moving through a vein or artery, suspension rheology, sedimentation, and coagulation.</p></div> <div class="art-list-item-tools small wd-abstr-lower"> <a class="mr-2" href="https://doi.org/10.1088/1873-7005/ad8b66">https://doi.org/10.1088/1873-7005/ad8b66</a> </div> </div> </div> </div> </div>  </div> </div> </div>     <div tabindex="0" role="tabpanel" id="review-articles-tab" aria-labelledby="review-articles" hidden="hidden"> <div class=" reveal-container reveal-closed reveal-enabled reveal-container--jnl-tab"> <h2 class="tabpanel__title"> <button type="button" class="reveal-trigger event_tabs-accordion" aria-expanded="false"> <svg aria-hidden="true" class="fa-icon fa-icon--left fa-icon--flip" role="img" focusable="false" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 320 512"><path d="M137.4 374.6c12.5 12.5 32.8 12.5 45.3 0l128-128c9.2-9.2 11.9-22.9 6.9-34.9s-16.6-19.8-29.6-19.8L32 192c-12.9 0-24.6 7.8-29.6 19.8s-2.2 25.7 6.9 34.9l128 128z"/></svg>Review articles</button> </h2> <div class="reveal-content tabpanel__content" style="display: none"> <p> <button data-reveal-label-alt="Close all abstracts" class="reveal-all-trigger mr-2 small" data-reveal-text="Open all abstracts" data-link-purpose-append="in this tab" data-link-purpose-append-open="in this tab"> Open all abstracts<span class="offscreen-hidden">, in this tab</span> </button> </p>  <div class="art-list"> <div class="art-list-item reveal-container reveal-closed"> <div class="art-list-item-body"> <a href="/article/10.1088/1873-7005/ac10f0" class="art-list-item-title event_main-link">Towards understanding the algorithms for solving the Navier–Stokes equations</a> <p class="small art-list-item-meta"> Sergey V Ershkov <em>et al</em> 2021 <em>Fluid Dyn. Res.</em> <b>53</b> 044501 </p> <div class="art-list-item-tools small wd-abstr-upper"> <button type="button" class="reveal-trigger mr-2 nowrap"> <svg aria-hidden="true" class="fa-icon fa-icon--left fa-icon--flip" role="img" focusable="false" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 320 512"><path d="M137.4 374.6c12.5 12.5 32.8 12.5 45.3 0l128-128c9.2-9.2 11.9-22.9 6.9-34.9s-16.6-19.8-29.6-19.8L32 192c-12.9 0-24.6 7.8-29.6 19.8s-2.2 25.7 6.9 34.9l128 128z"/></svg><span class="reveal-trigger-label" data-reveal-text="Open abstract" data-reveal-label-alt="Close abstract" data-link-purpose-append="Towards understanding the algorithms for solving the Navier–Stokes equations" data-link-purpose-append-open="Towards understanding the algorithms for solving the Navier–Stokes equations">Open abstract</span> </button> <a href="/article/10.1088/1873-7005/ac10f0/meta" class="mr-2 mb-0 nowrap event_mini-link" data-event-action="View article"> <span class="icon-article"></span>View article<span class="offscreen-hidden">, Towards understanding the algorithms for solving the Navier–Stokes equations</span></a> <a href="/article/10.1088/1873-7005/ac10f0/pdf" class="mr-2 mb-0 nowrap event_mini-link" data-event-action="PDF"><span class="icon-file-pdf"></span>PDF<span class="offscreen-hidden">, Towards understanding the algorithms for solving the Navier–Stokes equations</span></a> </div> <div class="reveal-content"> <div class="article-text view-text-small"><p>In this paper, we present a review of featured works in the field of hydrodynamics with the main aim to clarify the ways of understanding the algorithms for solving the Navier–Stokes equations. Discussing the existing algorithms, approaches and analytical or semi-analytical methods, we especially note that important problems of stability for the exact solutions should be explored accordingly relate to this respect, e.g. exploring the case of non-stationary helical flows of the Navier–Stokes equations for incompressible fluids with variable (spatially dependent) coefficient of proportionality <i>α</i> between velocity and the curl field of the flow. Meanwhile, the system of Navier–Stokes equations (including continuity equation) has been successfully explored previously with respect to the existence of analytical way for presentation of non-stationary helical flows of the aforementioned type. Conditions for the stability criteria of the exact solution for such the type of flows are obtained herein in the current research, for which non-stationary helical flow with invariant Bernoulli-function is considered.</p></div> <div class="art-list-item-tools small wd-abstr-lower"> <a class="mr-2" href="https://doi.org/10.1088/1873-7005/ac10f0">https://doi.org/10.1088/1873-7005/ac10f0</a> </div> </div> </div> </div> <div class="art-list-item reveal-container reveal-closed"> <div class="art-list-item-body"> <a href="/article/10.1088/1873-7005/aa6a66" class="art-list-item-title event_main-link">A review of underwater bio-mimetic propulsion: cruise and fast-start</a> <p class="small art-list-item-meta"> Li-Ming Chao <em>et al</em> 2017 <em>Fluid Dyn. Res.</em> <b>49</b> 044501 </p> <div class="art-list-item-tools small wd-abstr-upper"> <button type="button" class="reveal-trigger mr-2 nowrap"> <svg aria-hidden="true" class="fa-icon fa-icon--left fa-icon--flip" role="img" focusable="false" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 320 512"><path d="M137.4 374.6c12.5 12.5 32.8 12.5 45.3 0l128-128c9.2-9.2 11.9-22.9 6.9-34.9s-16.6-19.8-29.6-19.8L32 192c-12.9 0-24.6 7.8-29.6 19.8s-2.2 25.7 6.9 34.9l128 128z"/></svg><span class="reveal-trigger-label" data-reveal-text="Open abstract" data-reveal-label-alt="Close abstract" data-link-purpose-append="A review of underwater bio-mimetic propulsion: cruise and fast-start" data-link-purpose-append-open="A review of underwater bio-mimetic propulsion: cruise and fast-start">Open abstract</span> </button> <a href="/article/10.1088/1873-7005/aa6a66/meta" class="mr-2 mb-0 nowrap event_mini-link" data-event-action="View article"> <span class="icon-article"></span>View article<span class="offscreen-hidden">, A review of underwater bio-mimetic propulsion: cruise and fast-start</span></a> <a href="/article/10.1088/1873-7005/aa6a66/pdf" class="mr-2 mb-0 nowrap event_mini-link" data-event-action="PDF"><span class="icon-file-pdf"></span>PDF<span class="offscreen-hidden">, A review of underwater bio-mimetic propulsion: cruise and fast-start</span></a> </div> <div class="reveal-content"> <div class="article-text view-text-small"><p>This paper reviews recent developments in the understanding of underwater bio-mimetic propulsion. Two impressive models of underwater propulsion are considered: cruise and fast-start. First, we introduce the progression of bio-mimetic propulsion, especially underwater propulsion, where some primary conceptions are touched upon. Second, the understanding of flapping foils, considered as one of the most efficient cruise styles of aquatic animals, is introduced, where the effect of kinematics and the shape and flexibility of foils on generating thrust are elucidated respectively. Fast-start propulsion is always exhibited when predator behaviour occurs, and we provide an explicit introduction of corresponding zoological experiments and numerical simulations. We also provide some predictions about underwater bio-mimetic propulsion.</p></div> <div class="art-list-item-tools small wd-abstr-lower"> <a class="mr-2" href="https://doi.org/10.1088/1873-7005/aa6a66">https://doi.org/10.1088/1873-7005/aa6a66</a> </div> </div> </div> </div> <div class="art-list-item reveal-container reveal-closed"> <div class="art-list-item-body"> <a href="/article/10.1088/0169-5983/47/5/051201" class="art-list-item-title event_main-link">Numerical simulation of real-world flows</a> <p class="small art-list-item-meta"> Toshiyuki Hayase 2015 <em>Fluid Dyn. Res.</em> <b>47</b> 051201 </p> <div class="art-list-item-tools small wd-abstr-upper"> <button type="button" class="reveal-trigger mr-2 nowrap"> <svg aria-hidden="true" class="fa-icon fa-icon--left fa-icon--flip" role="img" focusable="false" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 320 512"><path d="M137.4 374.6c12.5 12.5 32.8 12.5 45.3 0l128-128c9.2-9.2 11.9-22.9 6.9-34.9s-16.6-19.8-29.6-19.8L32 192c-12.9 0-24.6 7.8-29.6 19.8s-2.2 25.7 6.9 34.9l128 128z"/></svg><span class="reveal-trigger-label" data-reveal-text="Open abstract" data-reveal-label-alt="Close abstract" data-link-purpose-append="Numerical simulation of real-world flows" data-link-purpose-append-open="Numerical simulation of real-world flows">Open abstract</span> </button> <a href="/article/10.1088/0169-5983/47/5/051201/meta" class="mr-2 mb-0 nowrap event_mini-link" data-event-action="View article"> <span class="icon-article"></span>View article<span class="offscreen-hidden">, Numerical simulation of real-world flows</span></a> <a href="/article/10.1088/0169-5983/47/5/051201/pdf" class="mr-2 mb-0 nowrap event_mini-link" data-event-action="PDF"><span class="icon-file-pdf"></span>PDF<span class="offscreen-hidden">, Numerical simulation of real-world flows</span></a> </div> <div class="reveal-content"> <div class="article-text view-text-small"><p>Obtaining real flow information is important in various fields, but is a difficult issue because measurement data are usually limited in time and space, and computational results usually do not represent the exact state of real flows. Problems inherent in the realization of numerical simulation of real-world flows include the difficulty in representing exact initial and boundary conditions and the difficulty in representing unstable flow characteristics. This article reviews studies dealing with these problems. First, an overview of basic flow measurement methodologies and measurement data interpolation/approximation techniques is presented. Then, studies on methods of integrating numerical simulation and measurement, namely, four-dimensional variational data assimilation (4D-Var), Kalman filters (KFs), state observers, etc are discussed. The first problem is properly solved by these integration methodologies. The second problem can be partially solved with 4D-Var in which only initial and boundary conditions are control parameters. If an appropriate control parameter capable of modifying the dynamical structure of the model is included in the formulation of 4D-Var, unstable modes are properly suppressed and the second problem is solved. The state observer and KFs also solve the second problem by modifying mathematical models to stabilize the unstable modes of the original dynamical system by applying feedback signals. These integration methodologies are now applied in simulation of real-world flows in a wide variety of research fields. Examples are presented for basic fluid dynamics and applications in meteorology, aerospace, medicine, etc.</p></div> <div class="art-list-item-tools small wd-abstr-lower"> <a class="mr-2" href="https://doi.org/10.1088/0169-5983/47/5/051201">https://doi.org/10.1088/0169-5983/47/5/051201</a> </div> </div> </div> </div> <div class="art-list-item reveal-container reveal-closed"> <div class="art-list-item-body"> <a href="/article/10.1088/0169-5983/45/3/034501" class="art-list-item-title event_main-link">Lattice Boltzmann methods for complex micro-flows: applicability and limitations for practical applications</a> <p class="small art-list-item-meta"> K Suga 2013 <em>Fluid Dyn. Res.</em> <b>45</b> 034501 </p> <div class="art-list-item-tools small wd-abstr-upper"> <button type="button" class="reveal-trigger mr-2 nowrap"> <svg aria-hidden="true" class="fa-icon fa-icon--left fa-icon--flip" role="img" focusable="false" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 320 512"><path d="M137.4 374.6c12.5 12.5 32.8 12.5 45.3 0l128-128c9.2-9.2 11.9-22.9 6.9-34.9s-16.6-19.8-29.6-19.8L32 192c-12.9 0-24.6 7.8-29.6 19.8s-2.2 25.7 6.9 34.9l128 128z"/></svg><span class="reveal-trigger-label" data-reveal-text="Open abstract" data-reveal-label-alt="Close abstract" data-link-purpose-append="Lattice Boltzmann methods for complex micro-flows: applicability and limitations for practical applications" data-link-purpose-append-open="Lattice Boltzmann methods for complex micro-flows: applicability and limitations for practical applications">Open abstract</span> </button> <a href="/article/10.1088/0169-5983/45/3/034501/meta" class="mr-2 mb-0 nowrap event_mini-link" data-event-action="View article"> <span class="icon-article"></span>View article<span class="offscreen-hidden">, Lattice Boltzmann methods for complex micro-flows: applicability and limitations for practical applications</span></a> <a href="/article/10.1088/0169-5983/45/3/034501/pdf" class="mr-2 mb-0 nowrap event_mini-link" data-event-action="PDF"><span class="icon-file-pdf"></span>PDF<span class="offscreen-hidden">, Lattice Boltzmann methods for complex micro-flows: applicability and limitations for practical applications</span></a> </div> <div class="reveal-content"> <div class="article-text view-text-small"><p>The extensive evaluation studies of the lattice Boltzmann method for micro-scale flows (<i>μ</i>-flow LBM) by the author's group are summarized. For the two-dimensional test cases, force-driven Poiseuille flows, Couette flows, a combined nanochannel flow, and flows in a nanochannel with a square- or triangular cylinder are discussed. The three-dimensional (3D) test cases are nano-mesh flows and a flow between 3D bumpy walls. The reference data for the complex test flow geometries are from the molecular dynamics simulations of the Lennard-Jones fluid by the author's group. The focused flows are mainly in the slip and a part of the transitional flow regimes at <i>Kn</i> < 1. The evaluated schemes of the <i>μ</i>-flow LBMs are the lattice Bhatnagar–Gross–Krook and the multiple-relaxation time LBMs with several boundary conditions and discrete velocity models. The effects of the discrete velocity models, the wall boundary conditions, the near-wall correction models of the molecular mean free path and the regularization process are discussed to confirm the applicability and the limitations of the <i>μ</i>-flow LBMs for complex flow geometries.</p></div> <div class="art-list-item-tools small wd-abstr-lower"> <a class="mr-2" href="https://doi.org/10.1088/0169-5983/45/3/034501">https://doi.org/10.1088/0169-5983/45/3/034501</a> </div> </div> </div> </div> <div class="art-list-item reveal-container reveal-closed"> <div class="art-list-item-body"> <a href="/article/10.1088/0169-5983/44/3/031201" class="art-list-item-title event_main-link">Directed percolation model for turbulence transition in shear flows</a> <p class="small art-list-item-meta"> Korinna T Allhoff and Bruno Eckhardt 2012 <em>Fluid Dyn. Res.</em> <b>44</b> 031201 </p> <div class="art-list-item-tools small wd-abstr-upper"> <button type="button" class="reveal-trigger mr-2 nowrap"> <svg aria-hidden="true" class="fa-icon fa-icon--left fa-icon--flip" role="img" focusable="false" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 320 512"><path d="M137.4 374.6c12.5 12.5 32.8 12.5 45.3 0l128-128c9.2-9.2 11.9-22.9 6.9-34.9s-16.6-19.8-29.6-19.8L32 192c-12.9 0-24.6 7.8-29.6 19.8s-2.2 25.7 6.9 34.9l128 128z"/></svg><span class="reveal-trigger-label" data-reveal-text="Open abstract" data-reveal-label-alt="Close abstract" data-link-purpose-append="Directed percolation model for turbulence transition in shear flows" data-link-purpose-append-open="Directed percolation model for turbulence transition in shear flows">Open abstract</span> </button> <a href="/article/10.1088/0169-5983/44/3/031201/meta" class="mr-2 mb-0 nowrap event_mini-link" data-event-action="View article"> <span class="icon-article"></span>View article<span class="offscreen-hidden">, Directed percolation model for turbulence transition in shear flows</span></a> <a href="/article/10.1088/0169-5983/44/3/031201/pdf" class="mr-2 mb-0 nowrap event_mini-link" data-event-action="PDF"><span class="icon-file-pdf"></span>PDF<span class="offscreen-hidden">, Directed percolation model for turbulence transition in shear flows</span></a> </div> <div class="reveal-content"> <div class="article-text view-text-small"><p>We analyze a 1 + 1-dimensional directed percolation system as a model for the spatio-temporal aspects of the turbulence transition in pipe flow and other shear flows. Space and time are discrete, and the model is characterized by two parameters: one describes the probability to remain turbulent in the next step and the other characterizes the spreading of turbulence to the neighboring cells. The transition to a persistent turbulence is evident in mean field arguments, but the actual critical values and exponents are considerably renormalized by fluctuations. Extensive numerical tests show that the model falls into the universality class of one-dimensional (1D) directed percolation. We also discuss the spreading of localized perturbations and an extension to 2D systems.</p></div> <div class="art-list-item-tools small wd-abstr-lower"> <a class="mr-2" href="https://doi.org/10.1088/0169-5983/44/3/031201">https://doi.org/10.1088/0169-5983/44/3/031201</a> </div> </div> </div> </div> </div>  </div> </div> </div>       <div tabindex="0" role="tabpanel" id="accepted-manuscripts-tab" aria-labelledby="accepted-manuscripts" hidden="hidden"> <div class="reveal-container reveal-closed reveal-enabled reveal-container--jnl-tab"> <h2 class="tabpanel__title"> <button type="button" class="reveal-trigger event_tabs-accordion" aria-expanded="false"> <svg aria-hidden="true" class="fa-icon fa-icon--left fa-icon--flip" role="img" focusable="false" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 320 512"><path d="M137.4 374.6c12.5 12.5 32.8 12.5 45.3 0l128-128c9.2-9.2 11.9-22.9 6.9-34.9s-16.6-19.8-29.6-19.8L32 192c-12.9 0-24.6 7.8-29.6 19.8s-2.2 25.7 6.9 34.9l128 128z"/></svg>Accepted manuscripts</button> </h2> <div class="reveal-content tabpanel__content" style="display: none;">  <p id="jnl-issue-disp-links" class="cf"> <button data-reveal-label-alt="Close all abstracts" class="reveal-all-trigger mr-2 small" data-reveal-text="Open all abstracts" data-link-purpose-append="in this tab" data-link-purpose-append-open="in this tab">Open all abstracts<span class="offscreen-hidden">, in this tab</span></button> </p>  <div class="art-list" id="wd-jnl-issue-art-list"> <div class="art-list-item reveal-container reveal-closed"> <div class="art-list-item-body"> <a href="/article/10.1088/1873-7005/ad934e" class="art-list-item-title event_main-link">Particle spacing and stability of initially staggered deformable particle trains migrating in a channel</a> <p class="small art-list-item-meta"> Xu et al  </p> <div class="art-list-item-tools small wd-abstr-upper"> <button type="button" class="reveal-trigger mr-2 nowrap"> <svg aria-hidden="true" class="fa-icon fa-icon--left fa-icon--flip" role="img" focusable="false" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 320 512"><path d="M137.4 374.6c12.5 12.5 32.8 12.5 45.3 0l128-128c9.2-9.2 11.9-22.9 6.9-34.9s-16.6-19.8-29.6-19.8L32 192c-12.9 0-24.6 7.8-29.6 19.8s-2.2 25.7 6.9 34.9l128 128z"/></svg><span class="reveal-trigger-label" data-reveal-text="Open abstract" data-reveal-label-alt="Close abstract" data-link-purpose-append="Particle spacing and stability of initially staggered deformable particle trains migrating in a channel" data-link-purpose-append-open="Particle spacing and stability of initially staggered deformable particle trains migrating in a channel">Open abstract</span> </button> <a href="/article/10.1088/1873-7005/ad934e/meta" class="mr-2 mb-0 nowrap event_mini-link" data-event-action="View article"> <span class="icon-article"></span>View accepted manuscript<span class="offscreen-hidden">, Particle spacing and stability of initially staggered deformable particle trains migrating in a channel</span></a> <a href="/article/10.1088/1873-7005/ad934e/pdf" class="mr-2 mb-0 nowrap event_mini-link" data-event-action="PDF"><span class="icon-file-pdf"></span>PDF<span class="offscreen-hidden">, Particle spacing and stability of initially staggered deformable particle trains migrating in a channel</span></a> </div> <div class="reveal-content"> <div class="article-text view-text-small"> <p>We investigated the inertial migration of deformable particles in a two-dimensional channel flow. This study analyzes the effects of the channel Reynolds number ($Re$), channel blockage ratio ($k$), particle number ($N_p$) and reduced bending modulus ($E_b$) on the formation of staggered particle trains. The results show that the stable normalized distance $d_{p_{eq}} / H$ between two staggered particles is influenced by $Re$, $k$ and $E_b$, where $H$ is the channel width. As $k$ increases or $E_b$ decreases, $d_{p_{eq}} / H$ decreases. The value of $d_{p_{eq}} / H$ initially increases and then decreases with the increase of $Re$; when $E_b$ is large and $k$ is small, $d_{p_{eq}} / H$ continuously increases with increasing $Re$. With the increase of $N_p$, the closely arranged staggered particle trains evolve into five distinct migration Regimes. We explain the conditions for the formation of each Regime and explore the mechanisms of their interconversion. The findings of this study contribute to a better understanding of the self-organization process of deformable particles in channel flow.</p> </div> <div class="art-list-item-tools small wd-abstr-lower"> <a class="mr-2" href="https://doi.org/10.1088/1873-7005/ad934e">https://doi.org/10.1088/1873-7005/ad934e</a> </div> </div> </div> </div> </div>   </div> </div> </div>     <div tabindex="0" role="tabpanel" id="open-access-articles-tab" aria-labelledby="open-access-articles" hidden="hidden"> <div class=" reveal-container reveal-closed reveal-enabled reveal-container--jnl-tab"> <h2 class="tabpanel__title"> <button type="button" class="reveal-trigger event_tabs-accordion" aria-expanded="false"> <svg aria-hidden="true" class="fa-icon fa-icon--left fa-icon--flip" role="img" focusable="false" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 320 512"><path d="M137.4 374.6c12.5 12.5 32.8 12.5 45.3 0l128-128c9.2-9.2 11.9-22.9 6.9-34.9s-16.6-19.8-29.6-19.8L32 192c-12.9 0-24.6 7.8-29.6 19.8s-2.2 25.7 6.9 34.9l128 128z"/></svg>Open access</button> </h2> <div class="reveal-content tabpanel__content" style="display: none"> <p> <button data-reveal-label-alt="Close all abstracts" class="reveal-all-trigger mr-2 small" data-reveal-text="Open all abstracts" data-link-purpose-append="in this tab" data-link-purpose-append-open="in this tab"> Open all abstracts<span class="offscreen-hidden">, in this tab</span> </button> </p>  <div class="art-list"> <div class="art-list-item reveal-container reveal-closed"> <div class="art-list-item-body"> <div class="eyebrow"> <span class="offscreen-hidden">The following article is </span><span class="red">Open access</span> </div> <a href="/article/10.1088/1873-7005/ad8d08" class="art-list-item-title event_main-link">An integrated stairwise adaptive finite point scheme for the two-dimensional coupled Burgers' equation</a> <p class="small art-list-item-meta"> A Sreelakshmi <em>et al</em> 2024 <em>Fluid Dyn. Res.</em> <b>56</b> 065505 </p> <div class="art-list-item-tools small wd-abstr-upper"> <button type="button" class="reveal-trigger mr-2 nowrap"> <svg aria-hidden="true" class="fa-icon fa-icon--left fa-icon--flip" role="img" focusable="false" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 320 512"><path d="M137.4 374.6c12.5 12.5 32.8 12.5 45.3 0l128-128c9.2-9.2 11.9-22.9 6.9-34.9s-16.6-19.8-29.6-19.8L32 192c-12.9 0-24.6 7.8-29.6 19.8s-2.2 25.7 6.9 34.9l128 128z"/></svg><span class="reveal-trigger-label" data-reveal-text="Open abstract" data-reveal-label-alt="Close abstract" data-link-purpose-append="An integrated stairwise adaptive finite point scheme for the two-dimensional coupled Burgers’ equation" data-link-purpose-append-open="An integrated stairwise adaptive finite point scheme for the two-dimensional coupled Burgers’ equation">Open abstract</span> </button> <a href="/article/10.1088/1873-7005/ad8d08/meta" class="mr-2 mb-0 nowrap event_mini-link" data-event-action="View article"> <span class="icon-article"></span>View article<span class="offscreen-hidden">, An integrated stairwise adaptive finite point scheme for the two-dimensional coupled Burgers' equation</span></a> <a href="/article/10.1088/1873-7005/ad8d08/pdf" class="mr-2 mb-0 nowrap event_mini-link" data-event-action="PDF"><span class="icon-file-pdf"></span>PDF<span class="offscreen-hidden">, An integrated stairwise adaptive finite point scheme for the two-dimensional coupled Burgers' equation</span></a> </div> <div class="reveal-content"> <div class="article-text view-text-small"><p>This paper explores the potential of a streamlined adaptive finite point method (FPM) in tackling two-dimensional coupled Burgers' equations, employing them as a testbed for further advancements. Firstly the coupled system is transformed into a two-dimensional heat equation through Cole–Hopf transformation and then this transformed equation is split into one-dimensional heat equations at intermediate temporal levels along X and Y directions and these one-dimensional equations are finally to be treated with the adaptive FPM. The distinctive feature of the adaptive FPM used here lies in employing an implicit 4-point stencil within each local cell to compute the solution at a higher temporal level through a linear combination of solutions from the preceding temporal level. The coefficients involved in this linear combination are derived via the local fundamental solutions within that cell, thereby imbuing the formulations with the intrinsic essence of the exact solution. Moreover, the separation constant utilized is tailored to consistently integrate the influence of the initial solution, independent of the temporal level. The method's theoretical underpinnings ensure its conditionally stable, consistent, and convergent behavior. The accuracy of the scheme is substantiated by its proficient handling of diverse examples, attesting to its superior cost-effectiveness and time efficiency.</p></div> <div class="art-list-item-tools small wd-abstr-lower"> <a class="mr-2" href="https://doi.org/10.1088/1873-7005/ad8d08">https://doi.org/10.1088/1873-7005/ad8d08</a> </div> </div> </div> </div> <div class="art-list-item reveal-container reveal-closed"> <div class="art-list-item-body"> <div class="eyebrow"> <span class="offscreen-hidden">The following article is </span><span class="red">Open access</span> </div> <a href="/article/10.1088/1873-7005/ad8596" class="art-list-item-title event_main-link">Construction of a numerical model for cigarette smoking and combustion and simulation of combustion cone shape</a> <p class="small art-list-item-meta"> Huaiyuan Zhu <em>et al</em> 2024 <em>Fluid Dyn. Res.</em> <b>56</b> 065501 </p> <div class="art-list-item-tools small wd-abstr-upper"> <button type="button" class="reveal-trigger mr-2 nowrap"> <svg aria-hidden="true" class="fa-icon fa-icon--left fa-icon--flip" role="img" focusable="false" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 320 512"><path d="M137.4 374.6c12.5 12.5 32.8 12.5 45.3 0l128-128c9.2-9.2 11.9-22.9 6.9-34.9s-16.6-19.8-29.6-19.8L32 192c-12.9 0-24.6 7.8-29.6 19.8s-2.2 25.7 6.9 34.9l128 128z"/></svg><span class="reveal-trigger-label" data-reveal-text="Open abstract" data-reveal-label-alt="Close abstract" data-link-purpose-append="Construction of a numerical model for cigarette smoking and combustion and simulation of combustion cone shape" data-link-purpose-append-open="Construction of a numerical model for cigarette smoking and combustion and simulation of combustion cone shape">Open abstract</span> </button> <a href="/article/10.1088/1873-7005/ad8596/meta" class="mr-2 mb-0 nowrap event_mini-link" data-event-action="View article"> <span class="icon-article"></span>View article<span class="offscreen-hidden">, Construction of a numerical model for cigarette smoking and combustion and simulation of combustion cone shape</span></a> <a href="/article/10.1088/1873-7005/ad8596/pdf" class="mr-2 mb-0 nowrap event_mini-link" data-event-action="PDF"><span class="icon-file-pdf"></span>PDF<span class="offscreen-hidden">, Construction of a numerical model for cigarette smoking and combustion and simulation of combustion cone shape</span></a> </div> <div class="reveal-content"> <div class="article-text view-text-small"><p>Understanding the thermal conditions inside a burning cigarette is a top priority for controlling chemical emissions and cigarette design. Since experimental methods are difficult to observe in depth, this paper starts from the perspective of numerical simulation and models the structure of the tobacco distribution of the cigarette, integrating the end surface ignition model, puffing model, chemical reaction model, heat and mass transfer and diffusion model have established a three-dimensional comprehensive model that can represent the changes in combustion cone morphology during cigarette combustion. The model covers chemical reaction and mass transfer as well as generation, flow and reaction mechanism. The simulation results show that the model can better predict the temperature distribution, component distribution and combustion cone morphology changes during cigarette smoking and combustion. It provides an effective means for in-depth research on cigarette combustion.</p></div> <div class="art-list-item-tools small wd-abstr-lower"> <a class="mr-2" href="https://doi.org/10.1088/1873-7005/ad8596">https://doi.org/10.1088/1873-7005/ad8596</a> </div> </div> </div> </div> <div class="art-list-item reveal-container reveal-closed"> <div class="art-list-item-body"> <div class="eyebrow"> <span class="offscreen-hidden">The following article is </span><span class="red">Open access</span> </div> <a href="/article/10.1088/1873-7005/ad85f7" class="art-list-item-title event_main-link">Interfacial characterization of spinning water film along a concave wall</a> <p class="small art-list-item-meta"> Ardalan Javadi and Alexander Alexeev 2024 <em>Fluid Dyn. Res.</em> <b>56</b> 055509 </p> <div class="art-list-item-tools small wd-abstr-upper"> <button type="button" class="reveal-trigger mr-2 nowrap"> <svg aria-hidden="true" class="fa-icon fa-icon--left fa-icon--flip" role="img" focusable="false" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 320 512"><path d="M137.4 374.6c12.5 12.5 32.8 12.5 45.3 0l128-128c9.2-9.2 11.9-22.9 6.9-34.9s-16.6-19.8-29.6-19.8L32 192c-12.9 0-24.6 7.8-29.6 19.8s-2.2 25.7 6.9 34.9l128 128z"/></svg><span class="reveal-trigger-label" data-reveal-text="Open abstract" data-reveal-label-alt="Close abstract" data-link-purpose-append="Interfacial characterization of spinning water film along a concave wall" data-link-purpose-append-open="Interfacial characterization of spinning water film along a concave wall">Open abstract</span> </button> <a href="/article/10.1088/1873-7005/ad85f7/meta" class="mr-2 mb-0 nowrap event_mini-link" data-event-action="View article"> <span class="icon-article"></span>View article<span class="offscreen-hidden">, Interfacial characterization of spinning water film along a concave wall</span></a> <a href="/article/10.1088/1873-7005/ad85f7/pdf" class="mr-2 mb-0 nowrap event_mini-link" data-event-action="PDF"><span class="icon-file-pdf"></span>PDF<span class="offscreen-hidden">, Interfacial characterization of spinning water film along a concave wall</span></a> </div> <div class="reveal-content"> <div class="article-text view-text-small"><p>Thin liquid film flowing down the inner concave surface of a vertical cylindrical vessel is examined. At the top of the vessel, the water is injected horizontally at high speed circumferentially along the vessel wall and flows downwards due to the action of gravity. This turbulent film flow is modeled using the large eddy simulation (LES) and Reynolds averaged Navier–Stokes (RANS) approaches combined with the volume-of-fluid method. The results of both methods are validated with direct numerical simulation. The Favre-filtered two-phase LES, which is implemented and studied in this paper, can reasonably predict the film thickness similarly to that of the RANS approach using the elliptic blending Reynolds stress model, although it requires fine resolution in the wall region. The effect of volume flow rate on the film structure and thickness is investigated. The film thickness is shown to be nearly constant when the wall is partially wetted and changes as the cubic root of the volume flow rate when the spinning film encloses the entire circumference of the vessel.</p></div> <div class="art-list-item-tools small wd-abstr-lower"> <a class="mr-2" href="https://doi.org/10.1088/1873-7005/ad85f7">https://doi.org/10.1088/1873-7005/ad85f7</a> </div> </div> </div> </div> <div class="art-list-item reveal-container reveal-closed"> <div class="art-list-item-body"> <div class="eyebrow"> <span class="offscreen-hidden">The following article is </span><span class="red">Open access</span> </div> <a href="/article/10.1088/1873-7005/ad8516" class="art-list-item-title event_main-link">Particle migration due to non-uniform laminar flow</a> <p class="small art-list-item-meta"> M A Curt Koenders and Nick Petford 2024 <em>Fluid Dyn. Res.</em> <b>56</b> 055508 </p> <div class="art-list-item-tools small wd-abstr-upper"> <button type="button" class="reveal-trigger mr-2 nowrap"> <svg aria-hidden="true" class="fa-icon fa-icon--left fa-icon--flip" role="img" focusable="false" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 320 512"><path d="M137.4 374.6c12.5 12.5 32.8 12.5 45.3 0l128-128c9.2-9.2 11.9-22.9 6.9-34.9s-16.6-19.8-29.6-19.8L32 192c-12.9 0-24.6 7.8-29.6 19.8s-2.2 25.7 6.9 34.9l128 128z"/></svg><span class="reveal-trigger-label" data-reveal-text="Open abstract" data-reveal-label-alt="Close abstract" data-link-purpose-append="Particle migration due to non-uniform laminar flow" data-link-purpose-append-open="Particle migration due to non-uniform laminar flow">Open abstract</span> </button> <a href="/article/10.1088/1873-7005/ad8516/meta" class="mr-2 mb-0 nowrap event_mini-link" data-event-action="View article"> <span class="icon-article"></span>View article<span class="offscreen-hidden">, Particle migration due to non-uniform laminar flow</span></a> <a href="/article/10.1088/1873-7005/ad8516/pdf" class="mr-2 mb-0 nowrap event_mini-link" data-event-action="PDF"><span class="icon-file-pdf"></span>PDF<span class="offscreen-hidden">, Particle migration due to non-uniform laminar flow</span></a> </div> <div class="reveal-content"> <div class="article-text view-text-small"><p>Using methods of granular mechanics in the quasi-static limit, with inter-particle interactions derived from the lubrication limit, the intensity of velocity fluctuations in the slurry is associated with fluctuations in the local distribution of inter-particle distances. These are shown to consist of a vector intensity and a scalar intensity; the former couples to the first velocity gradient, the latter (which is associated with solidosity fluctuations) couples to the second velocity gradient. Rheologies for both are presented, as is the rheology that links the particle pressure to the intensity of the velocity fluctuations (also known as the 'granular temperature') to the dispersive pressure. The rheologies are informed by experimental results. The granular temperature profile, modified from previous work, is responsible for axial particle migration (Bagnold effect). Two broad categories are assessed: symmetrical vertical and non-symmetrical lateral flow. For the latter the roughness of the boundary walls and a non-zero density contrast are important; this case is studied for a system in which flow effects are confined to the immediate vicinity of the boundary. Sensitivity analysis reveals several key variables including the parameters that control a slipping boundary condition and the mean solidosity in the conduit. For lateral flow, a sedimentary deposit with a solidosity profile may develop near the upper or lower boundary. The theory predicts an approximate relation between the fluid-particle density contrast and sediment thickness as a function of the mean flow rate, conduit width, the mean particle diameter and fluid viscosity that has utility in a range of engineering and geological situations where particulate matter is transported in the laminar flow regime.</p></div> <div class="art-list-item-tools small wd-abstr-lower"> <a class="mr-2" href="https://doi.org/10.1088/1873-7005/ad8516">https://doi.org/10.1088/1873-7005/ad8516</a> </div> </div> </div> </div> <div class="art-list-item reveal-container reveal-closed"> <div class="art-list-item-body"> <div class="eyebrow"> <span class="offscreen-hidden">The following article is </span><span class="red">Open access</span> </div> <a href="/article/10.1088/1873-7005/ad7aa0" class="art-list-item-title event_main-link">The effect of asymmetry on the absolute instability of confined jets and wakes</a> <p class="small art-list-item-meta"> Ryan Poole and M R Turner 2024 <em>Fluid Dyn. Res.</em> <b>56</b> 055504 </p> <div class="art-list-item-tools small wd-abstr-upper"> <button type="button" class="reveal-trigger mr-2 nowrap"> <svg aria-hidden="true" class="fa-icon fa-icon--left fa-icon--flip" role="img" focusable="false" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 320 512"><path d="M137.4 374.6c12.5 12.5 32.8 12.5 45.3 0l128-128c9.2-9.2 11.9-22.9 6.9-34.9s-16.6-19.8-29.6-19.8L32 192c-12.9 0-24.6 7.8-29.6 19.8s-2.2 25.7 6.9 34.9l128 128z"/></svg><span class="reveal-trigger-label" data-reveal-text="Open abstract" data-reveal-label-alt="Close abstract" data-link-purpose-append="The effect of asymmetry on the absolute instability of confined jets and wakes" data-link-purpose-append-open="The effect of asymmetry on the absolute instability of confined jets and wakes">Open abstract</span> </button> <a href="/article/10.1088/1873-7005/ad7aa0/meta" class="mr-2 mb-0 nowrap event_mini-link" data-event-action="View article"> <span class="icon-article"></span>View article<span class="offscreen-hidden">, The effect of asymmetry on the absolute instability of confined jets and wakes</span></a> <a href="/article/10.1088/1873-7005/ad7aa0/pdf" class="mr-2 mb-0 nowrap event_mini-link" data-event-action="PDF"><span class="icon-file-pdf"></span>PDF<span class="offscreen-hidden">, The effect of asymmetry on the absolute instability of confined jets and wakes</span></a> </div> <div class="reveal-content"> <div class="article-text view-text-small"><p>Jets and wakes are fundamental fluid flows that arise in a wide range of environmental and aerospace applications. They are typically studied as open systems. Here we are interested in the implications of placing the jet or wake inside of another system, as well as the implications of compliant walls. In particular, the effect of asymmetry is considered on the absolute instability properties for this internal flow, when it is transversely confined by compliant walls. Two distinct cases are considered, namely the case of two compliant walls with non-identical wall parameters and the case of identical compliant walls asymmetrically located about the fluid center line. The absolute instability characteristics are identified by following special saddle points (pinch points) of the dispersion relation in the complex wavenumber plane, and the flow's stability properties are mapped out using parameter continuation techniques. The compliant walls introduce new modes which typically dominate the stability properties of the flow, in comparison to the case of pure shear layers. In the case of symmetrically located walls with non-identical wall parameters, it was found that the absolute stability properties are dominated by the modes linked to the more flexible of the two walls. In the case of identical walls asymmetrically confining the flow, it was found that these flows exhibit smaller regions of absolute instability in parameter space, when compared to the symmetric flow configuration.</p></div> <div class="art-list-item-tools small wd-abstr-lower"> <a class="mr-2" href="https://doi.org/10.1088/1873-7005/ad7aa0">https://doi.org/10.1088/1873-7005/ad7aa0</a> </div> </div> </div> </div> <div class="art-list-item reveal-container reveal-closed"> <div class="art-list-item-body"> <div class="eyebrow"> <span class="offscreen-hidden">The following article is </span><span class="red">Open access</span> </div> <a href="/article/10.1088/1873-7005/ad716a" class="art-list-item-title event_main-link">Mode analysis for multiple parameter conditions of nozzle internal unsteady flow using Parametric Global Proper Orthogonal Decomposition</a> <p class="small art-list-item-meta"> Mikimasa Kawaguchi <em>et al</em> 2024 <em>Fluid Dyn. Res.</em> <b>56</b> 055501 </p> <div class="art-list-item-tools small wd-abstr-upper"> <button type="button" class="reveal-trigger mr-2 nowrap"> <svg aria-hidden="true" class="fa-icon fa-icon--left fa-icon--flip" role="img" focusable="false" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 320 512"><path d="M137.4 374.6c12.5 12.5 32.8 12.5 45.3 0l128-128c9.2-9.2 11.9-22.9 6.9-34.9s-16.6-19.8-29.6-19.8L32 192c-12.9 0-24.6 7.8-29.6 19.8s-2.2 25.7 6.9 34.9l128 128z"/></svg><span class="reveal-trigger-label" data-reveal-text="Open abstract" data-reveal-label-alt="Close abstract" data-link-purpose-append="Mode analysis for multiple parameter conditions of nozzle internal unsteady flow using Parametric Global Proper Orthogonal Decomposition" data-link-purpose-append-open="Mode analysis for multiple parameter conditions of nozzle internal unsteady flow using Parametric Global Proper Orthogonal Decomposition">Open abstract</span> </button> <a href="/article/10.1088/1873-7005/ad716a/meta" class="mr-2 mb-0 nowrap event_mini-link" data-event-action="View article"> <span class="icon-article"></span>View article<span class="offscreen-hidden">, Mode analysis for multiple parameter conditions of nozzle internal unsteady flow using Parametric Global Proper Orthogonal Decomposition</span></a> <a href="/article/10.1088/1873-7005/ad716a/pdf" class="mr-2 mb-0 nowrap event_mini-link" data-event-action="PDF"><span class="icon-file-pdf"></span>PDF<span class="offscreen-hidden">, Mode analysis for multiple parameter conditions of nozzle internal unsteady flow using Parametric Global Proper Orthogonal Decomposition</span></a> </div> <div class="reveal-content"> <div class="article-text view-text-small"><p>Analysis methods based on mode decomposition have been proposed to describe the characteristics of flow phenomena. Among them, proper orthogonal decomposition (POD), which decomposes modes into eigenvalues and basis vectors, has long been used. Many studies have shown that POD is a useful method for capturing the characteristics of unsteady flow. In particular, Snapshot POD has attracted much recent attention and has been used to solve unsteady flow problems. However, the basis vectors of the mode obtained by conventional POD is different for each condition. Therefore, whether the basis vectors of each mode are switching in the direction of parameters (e.g. different shapes or different Reynolds numbers) or whether they develop or decay is difficult to discuss. As a result, discussions on conventional POD tend to be qualitative. To address this issue, the present study uses Parametric Global POD, a method that perfectly matches basis vectors in results with different parameters (in this study, different Reynolds numbers). Parametric Global POD method was applied to the analysis of the flow field in a curved pipe and found to capture the development or decay of modes with major basis vectors in the direction of parameters, which is difficult to achieve with conventional POD methods.</p></div> <div class="art-list-item-tools small wd-abstr-lower"> <a class="mr-2" href="https://doi.org/10.1088/1873-7005/ad716a">https://doi.org/10.1088/1873-7005/ad716a</a> </div> </div> </div> </div> <div class="art-list-item reveal-container reveal-closed"> <div class="art-list-item-body"> <div class="eyebrow"> <span class="offscreen-hidden">The following article is </span><span class="red">Open access</span> </div> <a href="/article/10.1088/1873-7005/ad6c7b" class="art-list-item-title event_main-link">On the Lundgren hierarchy of helically symmetric turbulence</a> <p class="small art-list-item-meta"> V Stegmayer <em>et al</em> 2024 <em>Fluid Dyn. Res.</em> <b>56</b> 041402 </p> <div class="art-list-item-tools small wd-abstr-upper"> <button type="button" class="reveal-trigger mr-2 nowrap"> <svg aria-hidden="true" class="fa-icon fa-icon--left fa-icon--flip" role="img" focusable="false" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 320 512"><path d="M137.4 374.6c12.5 12.5 32.8 12.5 45.3 0l128-128c9.2-9.2 11.9-22.9 6.9-34.9s-16.6-19.8-29.6-19.8L32 192c-12.9 0-24.6 7.8-29.6 19.8s-2.2 25.7 6.9 34.9l128 128z"/></svg><span class="reveal-trigger-label" data-reveal-text="Open abstract" data-reveal-label-alt="Close abstract" data-link-purpose-append="On the Lundgren hierarchy of helically symmetric turbulence" data-link-purpose-append-open="On the Lundgren hierarchy of helically symmetric turbulence">Open abstract</span> </button> <a href="/article/10.1088/1873-7005/ad6c7b/meta" class="mr-2 mb-0 nowrap event_mini-link" data-event-action="View article"> <span class="icon-article"></span>View article<span class="offscreen-hidden">, On the Lundgren hierarchy of helically symmetric turbulence</span></a> <a href="/article/10.1088/1873-7005/ad6c7b/pdf" class="mr-2 mb-0 nowrap event_mini-link" data-event-action="PDF"><span class="icon-file-pdf"></span>PDF<span class="offscreen-hidden">, On the Lundgren hierarchy of helically symmetric turbulence</span></a> </div> <div class="reveal-content"> <div class="article-text view-text-small"><p>This paper analyzes the reduction of the infinite Lundgren–Monin–Novikov (LMN) hierarchy of probability density functions (PDFs) in the statistical theory of helically symmetric turbulence. Lundgren's hierarchy is considered a complete model, i.e. fully describes the joint multi-point statistic of turbulence though at the expense of dealing with an infinite set of integro-differential equations. The LMN hierarchy and its respective side-conditions are transformed to helical coordinates and thus are dimesionally reduced. In the course of development, a number of key questions were solved, namely in particular the transformation of PDFs and sample space velocities into orthonormal coordinate systems. In a validity check it is shown, that the mean momentum equations derived from the helical LMN hierarchy via statistical moment integration are identical to the mean momentum equations derived by direct ensemble averaging the Navier–Stokes equation, in helically symmetric form. Finally, we derive the equation for the characteristic function equivalent to the PDF equation in a helically symmetric frame, which allows to generate arbitrary <span xmlns:xlink="http://www.w3.org/1999/xlink" class="inline-eqn"><span class="tex"><span class="texImage"><img src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAQAAAC1HAwCAAAAC0lEQVR42mNkYAAAAAYAAjCB0C8AAAAASUVORK5CYII=" data-src="https://content.cld.iop.org/journals/1873-7005/56/4/041402/revision2/fdrad6c7bieqn1.gif" style="max-width: 100%;" alt="$n{\mathrm{^{th}}}$" align="top"></img></span><script type="math/tex">n{\mathrm{^{th}}}</script></span></span>-order statistical moments by simple differentiation.</p></div> <div class="art-list-item-tools small wd-abstr-lower"> <a class="mr-2" href="https://doi.org/10.1088/1873-7005/ad6c7b">https://doi.org/10.1088/1873-7005/ad6c7b</a> </div> </div> </div> </div> <div class="art-list-item reveal-container reveal-closed"> <div class="art-list-item-body"> <div class="eyebrow"> <span class="offscreen-hidden">The following article is </span><span class="red">Open access</span> </div> <a href="/article/10.1088/1873-7005/ad6289" class="art-list-item-title event_main-link">Mean streaming in reciprocating flow in a double bifurcation</a> <p class="small art-list-item-meta"> Chandrika Wanigasekara <em>et al</em> 2024 <em>Fluid Dyn. Res.</em> <b>56</b> 045505 </p> <div class="art-list-item-tools small wd-abstr-upper"> <button type="button" class="reveal-trigger mr-2 nowrap"> <svg aria-hidden="true" class="fa-icon fa-icon--left fa-icon--flip" role="img" focusable="false" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 320 512"><path d="M137.4 374.6c12.5 12.5 32.8 12.5 45.3 0l128-128c9.2-9.2 11.9-22.9 6.9-34.9s-16.6-19.8-29.6-19.8L32 192c-12.9 0-24.6 7.8-29.6 19.8s-2.2 25.7 6.9 34.9l128 128z"/></svg><span class="reveal-trigger-label" data-reveal-text="Open abstract" data-reveal-label-alt="Close abstract" data-link-purpose-append="Mean streaming in reciprocating flow in a double bifurcation" data-link-purpose-append-open="Mean streaming in reciprocating flow in a double bifurcation">Open abstract</span> </button> <a href="/article/10.1088/1873-7005/ad6289/meta" class="mr-2 mb-0 nowrap event_mini-link" data-event-action="View article"> <span class="icon-article"></span>View article<span class="offscreen-hidden">, Mean streaming in reciprocating flow in a double bifurcation</span></a> <a href="/article/10.1088/1873-7005/ad6289/pdf" class="mr-2 mb-0 nowrap event_mini-link" data-event-action="PDF"><span class="icon-file-pdf"></span>PDF<span class="offscreen-hidden">, Mean streaming in reciprocating flow in a double bifurcation</span></a> </div> <div class="reveal-content"> <div class="article-text view-text-small"><p>This paper reports the mean streaming flow generated in a double bifurcation during reciprocating flow calculated using direct numerical simulations. Motivated by the medical ventilation technique of high-frequency ventilation (HFV), we investigate the potential for mean streaming to be maintained in this geometry as the frequency of reciprocation is increased while concurrently reducing the amplitude (and thereby reducing the volume per cycle). We identify four distinct regimes of flow. The first and second occur at low to moderate frequencies and generate significant streaming flows due to the interaction between Dean vortices that are generated during both the in- and out-flows. The third and fourth occur at high frequencies and produce reduced streaming, due to the reduction in formation length of the Dean vortices. Notably, the fourth regime at the highest frequencies investigated appears to show a switch in the direction of the streaming flow at the wall. Considering the motivating application of HFV, we show that currently employed frequencies are low, and much higher frequencies (and subsequently lower volumes per cycle) could potentially be employed.</p></div> <div class="art-list-item-tools small wd-abstr-lower"> <a class="mr-2" href="https://doi.org/10.1088/1873-7005/ad6289">https://doi.org/10.1088/1873-7005/ad6289</a> </div> </div> </div> </div> <div class="art-list-item reveal-container reveal-closed"> <div class="art-list-item-body"> <div class="eyebrow"> <span class="offscreen-hidden">The following article is </span><span class="red">Open access</span> </div> <a href="/article/10.1088/1873-7005/ad5abc" class="art-list-item-title event_main-link">Bayesian parameter estimation and evaluation of the <i>K-</i>ω shear stress transport model for plane impinging jets</a> <p class="small art-list-item-meta"> M L Lanahan <em>et al</em> 2024 <em>Fluid Dyn. Res.</em> <b>56</b> 041401 </p> <div class="art-list-item-tools small wd-abstr-upper"> <button type="button" class="reveal-trigger mr-2 nowrap"> <svg aria-hidden="true" class="fa-icon fa-icon--left fa-icon--flip" role="img" focusable="false" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 320 512"><path d="M137.4 374.6c12.5 12.5 32.8 12.5 45.3 0l128-128c9.2-9.2 11.9-22.9 6.9-34.9s-16.6-19.8-29.6-19.8L32 192c-12.9 0-24.6 7.8-29.6 19.8s-2.2 25.7 6.9 34.9l128 128z"/></svg><span class="reveal-trigger-label" data-reveal-text="Open abstract" data-reveal-label-alt="Close abstract" data-link-purpose-append="Bayesian parameter estimation and evaluation of the K-ω shear stress transport model for plane impinging jets" data-link-purpose-append-open="Bayesian parameter estimation and evaluation of the K-ω shear stress transport model for plane impinging jets">Open abstract</span> </button> <a href="/article/10.1088/1873-7005/ad5abc/meta" class="mr-2 mb-0 nowrap event_mini-link" data-event-action="View article"> <span class="icon-article"></span>View article<span class="offscreen-hidden">, Bayesian parameter estimation and evaluation of the K-ω shear stress transport model for plane impinging jets</span></a> <a href="/article/10.1088/1873-7005/ad5abc/pdf" class="mr-2 mb-0 nowrap event_mini-link" data-event-action="PDF"><span class="icon-file-pdf"></span>PDF<span class="offscreen-hidden">, Bayesian parameter estimation and evaluation of the K-ω shear stress transport model for plane impinging jets</span></a> </div> <div class="reveal-content"> <div class="article-text view-text-small"><p>Numerical simulations with semi-empirical turbulence models are commonly used to model impinging jets, often used for cooling solid surfaces. In this work, the constants in the <i>k-ω</i> shear stress transport model in ANSYS FLUENT are calibrated to experimental velocity and heat transfer data for a plane turbulent impinging air jet to determine if Kennedy-O'Hagan calibration (Kennedy and O'Hagan 2001 <i>J. R. Stat. Soc.</i> B <b>63</b> 425–64) can improve predictions of near-surface velocities and surface Nusselt numbers for similar flows. Impinging jets have been proposed to cool the target plates of the divertor in future magnetic fusion energy reactors, where simulations are used to estimate divertor performance. The flat-plate divertor (Wang <i>et al</i> 2009 <i>Fusion Sci. Technol.</i><b>56</b> 1023–7) uses a plane jet of helium issuing from a <i>B</i> = 0.5 mm slot to cool a surface with radius of curvature of 44<i>B</i> at a distance 4<i>B</i> from the slot. Predictions from the calibrated numerical model are compared with independent experimental data at different flow conditions, as well as surface temperature data for a flat plate divertor test section. The contribution of this work is evaluation of the accuracy of a calibrated turbulence model for modest extrapolations in flow geometry and flow conditions for a plane impinging jet.</p></div> <div class="art-list-item-tools small wd-abstr-lower"> <a class="mr-2" href="https://doi.org/10.1088/1873-7005/ad5abc">https://doi.org/10.1088/1873-7005/ad5abc</a> </div> </div> </div> </div> <div class="art-list-item reveal-container reveal-closed"> <div class="art-list-item-body"> <div class="eyebrow"> <span class="offscreen-hidden">The following article is </span><span class="red">Open access</span> </div> <a href="/article/10.1088/1873-7005/ad5b18" class="art-list-item-title event_main-link">Sampling of plasma plume from atmosphere into vacuum for reliable Langmuir probe diagnostics</a> <p class="small art-list-item-meta"> James Raja S <em>et al</em> 2024 <em>Fluid Dyn. Res.</em> <b>56</b> 045501 </p> <div class="art-list-item-tools small wd-abstr-upper"> <button type="button" class="reveal-trigger mr-2 nowrap"> <svg aria-hidden="true" class="fa-icon fa-icon--left fa-icon--flip" role="img" focusable="false" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 320 512"><path d="M137.4 374.6c12.5 12.5 32.8 12.5 45.3 0l128-128c9.2-9.2 11.9-22.9 6.9-34.9s-16.6-19.8-29.6-19.8L32 192c-12.9 0-24.6 7.8-29.6 19.8s-2.2 25.7 6.9 34.9l128 128z"/></svg><span class="reveal-trigger-label" data-reveal-text="Open abstract" data-reveal-label-alt="Close abstract" data-link-purpose-append="Sampling of plasma plume from atmosphere into vacuum for reliable Langmuir probe diagnostics" data-link-purpose-append-open="Sampling of plasma plume from atmosphere into vacuum for reliable Langmuir probe diagnostics">Open abstract</span> </button> <a href="/article/10.1088/1873-7005/ad5b18/meta" class="mr-2 mb-0 nowrap event_mini-link" data-event-action="View article"> <span class="icon-article"></span>View article<span class="offscreen-hidden">, Sampling of plasma plume from atmosphere into vacuum for reliable Langmuir probe diagnostics</span></a> <a href="/article/10.1088/1873-7005/ad5b18/pdf" class="mr-2 mb-0 nowrap event_mini-link" data-event-action="PDF"><span class="icon-file-pdf"></span>PDF<span class="offscreen-hidden">, Sampling of plasma plume from atmosphere into vacuum for reliable Langmuir probe diagnostics</span></a> </div> <div class="reveal-content"> <div class="article-text view-text-small"><p>Langmuir probes cannot be used to diagnose cold atmospheric plasma jet, because their presence in the high electric field after-glow region modifies the plasma parameters that they are intended to measure. Here, we propose a system to sample the plasma plume from ambient conditions into a low-pressure region, where probe analysis can be accomplished. The effect of such a sampling process on the number density and velocity of the gas has been studied through simulations and using analytical equations. Simulation results regarding the effect of chamber and orifice dimensions on these parameters, have been presented. Based on this study an experimental chamber was fabricated and Langmuir probe analysis of the sampled plasma was done. Continuum flowing plasma theory was applied and the plasma density and electron temperature were estimated to be 1.8 <b>×</b> 10<sup>20</sup>m<sup>−3</sup> and 4.7 eV respectively for the operating condition of 3 W plasma power at 12 kHz.</p></div> <div class="art-list-item-tools small wd-abstr-lower"> <a class="mr-2" href="https://doi.org/10.1088/1873-7005/ad5b18">https://doi.org/10.1088/1873-7005/ad5b18</a> </div> </div> </div> </div> </div>  <p> <a href="/nsearch?currentPage=1&terms=&nextPage=2&previousPage=-1&searchDatePeriod=anytime&journals=1873-7005&accessType=open-access&orderBy=newest&pageLength=20">More Open Access articles</a> </p> </div> </div> </div>    </div>  </div>  </div> </main> <div class="db2 tb2"> <div class="side-and-below">  <div class="sidebar-list" id="wd-jnl-links"> <h2 class="sidebar-list__heading">Journal links</h2> <ul class="sidebar-list__list"><li><a href="https://mc04.manuscriptcentral.com/fdr"target="_blank"><strong>Submit an article</strong></a></li> 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