Physical Review Fluids最新文献

Steady streaming in channels with a porous interior. 在内部多孔的通道中稳定流动。

IF 2.5 3区物理与天体物理

Physical Review Fluids Pub Date : 2025-09-01 Epub Date: 2025-09-15 DOI: 10.1103/89kj-npfn

Guillermo L Nozaleda, Javier Alaminos-Quesada, Cándido Gutiérrez-Montes, Antonio L Sánchez

{"title":"Steady streaming in channels with a porous interior.","authors":"Guillermo L Nozaleda, Javier Alaminos-Quesada, Cándido Gutiérrez-Montes, Antonio L Sánchez","doi":"10.1103/89kj-npfn","DOIUrl":"10.1103/89kj-npfn","url":null,"abstract":"Hall, in his Ph.D. thesis (University of London, 1973), demonstrated that the viscous flow arising in a slender channel of slowly varying cross section subject to a purely oscillatory pressure difference between its open ends contains a steady streaming component. This study extends the analysis to channels with a porous interior. Using a homogenized flow model that incorporates a Darcy resistance term proportional to the local velocity, a closed-form solution for the streaming motion is derived in the asymptotic limit of small stroke-to-channel length ratios <math><mi>ε</mi> <mo>≪</mo> <mn>1</mn></math> . Consistent with Hall's findings, a net flow rate is seen to arise only when the channel ends have unequal widths. The presence of a porous medium significantly attenuates the streaming-flow magnitude, with the differences between porous and nonporous channels becoming more pronounced for large Womersley numbers, a limiting case considered separately. In nonporous channels with unequal end widths the streaming motion exhibits large velocities that are comparable in magnitude to those of the oscillatory flow, whereas in porous channels the streaming velocities remain a factor <math><mi>ε</mi></math> smaller. Channels with equal end widths feature streaming recirculating vortices within near-wall Stokes boundary layers. Nonporous channels display additional recirculating vortices in the central core region, which are absent in porous configurations. These results provide insights into transport processes in biomedical and technological applications involving oscillatory flow in wall-bounded porous media.","PeriodicalId":20160,"journal":{"name":"Physical Review Fluids","volume":"10 9","pages":""},"PeriodicalIF":2.5,"publicationDate":"2025-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12768334/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145912573","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

CoNFiLD-inlet: Synthetic turbulence inflow using generative latent diffusion models with neural fields. confield -inlet：利用神经场生成潜扩散模型合成湍流流入。

IF 3 3区物理与天体物理

Physical Review Fluids Pub Date : 2025-05-01 Epub Date: 2025-05-06 DOI: 10.1103/physrevfluids.10.054901

Xin-Yang Liu, Meet Hemant Parikh, Xiantao Fan, Pan Du, Qing Wang, Yi-Fan Chen, Jian-Xun Wang

{"title":"CoNFiLD-inlet: Synthetic turbulence inflow using generative latent diffusion models with neural fields.","authors":"Xin-Yang Liu, Meet Hemant Parikh, Xiantao Fan, Pan Du, Qing Wang, Yi-Fan Chen, Jian-Xun Wang","doi":"10.1103/physrevfluids.10.054901","DOIUrl":"10.1103/physrevfluids.10.054901","url":null,"abstract":"Eddy-resolving turbulence simulations require stochastic inflow conditions that accurately replicate the complex, multiscale structures of turbulence. Traditional recycling-based methods rely on computationally expensive precursor simulations while existing synthetic inflow generators often fail to reproduce realistic coherent structures of turbulence. Recent advances in deep learning (DL) have opened new possibilities for inflow turbulence generation, yet many DL-based methods rely on deterministic, autoregressive frameworks prone to error accumulation, resulting in poor robustness for long-term predictions. In this work, we present CoNFiLD-inlet, a novel DL-based inflow turbulence generator that integrates diffusion models with a conditional neural field to produce realistic, stochastic inflow turbulence. By parametrizing inflow conditions using Reynolds numbers, CoNFiLD-inlet generalizes effectively across a wide range of Reynolds numbers ( <math> <msub><mrow><mtext>Re</mtext></mrow> <mrow><mi>τ</mi></mrow> </msub> </math> between 103 and 104) without requiring retraining or parameter tuning. Comprehensive validation through a priori and a posteriori tests in direct numerical simulation and wall-modeled large-eddy simulation demonstrates its high fidelity, robustness, and scalability, positioning it as an efficient and versatile solution for inflow turbulence synthesis.","PeriodicalId":20160,"journal":{"name":"Physical Review Fluids","volume":"10 5","pages":""},"PeriodicalIF":3.0,"publicationDate":"2025-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC13108683/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147778522","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Optimal trajectories for Bayesian olfactory search in turbulent flows: The low information limit and beyond. 湍流中贝叶斯嗅觉搜索的最优轨迹：低信息限制及超越。

IF 3 3区物理与天体物理

Physical Review Fluids Pub Date : 2025-04-01 Epub Date: 2025-04-09 DOI: 10.1103/physrevfluids.10.044601

R A Heinonen, L Biferale, A Celani, M Vergassola

{"title":"Optimal trajectories for Bayesian olfactory search in turbulent flows: The low information limit and beyond.","authors":"R A Heinonen, L Biferale, A Celani, M Vergassola","doi":"10.1103/physrevfluids.10.044601","DOIUrl":"10.1103/physrevfluids.10.044601","url":null,"abstract":"In turbulent flows, tracking the source of a passive scalar cue requires exploiting the limited information that can be gleaned from rare, randomized encounters with the cue. When crafting a search policy, the most challenging and important decision is what to do in the absence of an encounter. In this work, we perform high-fidelity direct numerical simulations of a turbulent flow with a stationary source of tracer particles, and obtain quasi-optimal policies (in the sense of minimal average search time) with respect to the empirical encounter statistics [1-3]. We study the trajectories under such policies and compare the results to those of the infotaxis heuristic. In the presence of a strong mean wind, the optimal motion in the absence of an encounter is zigzagging (akin to the well-known insect behavior \"casting\") followed by a return to the starting location. The zigzag motion generates characteristic <math> <mrow><msup><mi>t</mi> <mrow><mn>1</mn> <mo>/</mo> <mn>2</mn></mrow> </msup> </mrow> </math> scaling of the rms displacement envelope. By passing to the limit where the probability of detection vanishes, we connect these results to the classical linear search problem and derive an estimate of the tail of the arrival time pdf as a stretched exponential <math><mrow><mi>p</mi> <mo>(</mo> <mi>T</mi> <mo>)</mo> <mo>∼</mo> <mtext>exp</mtext> <mo>(</mo> <mo>-</mo> <mi>k</mi> <msqrt><mi>T</mi></msqrt> <mo>)</mo></mrow> </math> for some <math><mrow><mi>k</mi> <mo>></mo> <mn>0</mn></mrow> </math> , in agreement with Monte Carlo results. We also discuss what happens as the wind speed becomes smaller.","PeriodicalId":20160,"journal":{"name":"Physical Review Fluids","volume":"10 4","pages":""},"PeriodicalIF":3.0,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12369886/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144965062","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Impact of a water drop on a water bed of varying depth 水滴对不同深度的水床的冲击

3区物理与天体物理

Physical Review Fluids Pub Date : 2025-02-13 DOI: 10.1103/physrevfluids.10.023603

Raghavendra Naidu S., Kamal Poddar, Sanjay Kumar

引用次数: 3

Bubble oscillation and effects of dynamic behaviors on forces and mass transfer in photoelectrochemical water splitting 气泡振荡及其动力学行为对光电化学水分解力和传质的影响

3区物理与天体物理

Physical Review Fluids Pub Date : 2024-11-25 DOI: 10.1103/physrevfluids.9.114305

Yonglu She, Qiang Xu, Tengfei Nie, Xinyi Luo, Mengsha Wang, Xingmiao Ye, Dengwei Jing, Liejin Guo

引用次数: 3

Flat-cupped transition in freezing drop impacts 冻结滴冲击中的平杯状转变

3区物理与天体物理

Physical Review Fluids Pub Date : 2024-10-15 DOI: 10.1103/physrevfluids.9.103602

Marion Berry, Christophe Josserand, Anniina Salonen, François Boulogne

引用次数: 2

Laboratory study of wave turbulence under isotropic forcing 各向同性作用下的波湍流实验室研究

IF 2.7 3区物理与天体物理

Physical Review Fluids Pub Date : 2024-09-19 DOI: 10.1103/physrevfluids.9.094803

Z. Taebel, M. L. McAllister, A. Scotti, M. Onorato, T. S. van den Bremer

引用次数: 0

Cavitation caused by an elastic membrane deforming under the jetting of a spark-induced bubble 在火花引发的气泡喷射作用下，弹性膜变形所产生的气蚀现象

IF 2.7 3区物理与天体物理

Physical Review Fluids Pub Date : 2024-09-19 DOI: 10.1103/physrevfluids.9.093604

Yuxue Zhong, Jingzhu Wang, Jianlin Huang, Yiwei Wang

{"title":"Cavitation caused by an elastic membrane deforming under the jetting of a spark-induced bubble","authors":"Yuxue Zhong, Jingzhu Wang, Jianlin Huang, Yiwei Wang","doi":"10.1103/physrevfluids.9.093604","DOIUrl":"https://doi.org/10.1103/physrevfluids.9.093604","url":null,"abstract":"The collapse of a spark-induced bubble results in a high-speed jet, and when that jet impacts an elastic membrane, the latter deforms considerably and is accompanied by secondary cavitation. The cavitation bubble then moves away from the membrane with subsequent oscillation. To study the mechanism for this cavitation, experiments involving diffuse light and particle image velocimetry were conducted to capture the behaviors of the cavitation bubble and flow field resulting from the rapid deformation of the membrane. Analyzing the velocity and pressure fields reveals secondary cavitation induced by a sudden acceleration rather than a large velocity. Secondary cavitation occurs when the dimensionless inertial force overcomes the dimensionless pressure difference required for cavitation; subjecting these dimensionless quantities to a parametric study shows that the secondary cavitation occurs when the former is greater than the latter. During the collapse of the cavitation bubble, a thin jet points toward the membrane with an impact velocity of approximately 35 m/s. The subsequent oscillation of the cavitation bubble results in vortex flow moving away from the membrane. These findings provide insights into engineering applications such as bioengineering and mixing.","PeriodicalId":20160,"journal":{"name":"Physical Review Fluids","volume":"5 1","pages":""},"PeriodicalIF":2.7,"publicationDate":"2024-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142251967","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Waves beneath a drop levitating over a moving wall 悬浮在移动墙上的水滴下的波浪

IF 2.7 3区物理与天体物理

Physical Review Fluids Pub Date : 2024-09-17 DOI: 10.1103/physrevfluids.9.093603

Kyle I. McKee, Bauyrzhan K. Primkulov, Kotaro Hashimoto, Yoshiyuki Tagawa, John W. M. Bush

{"title":"Waves beneath a drop levitating over a moving wall","authors":"Kyle I. McKee, Bauyrzhan K. Primkulov, Kotaro Hashimoto, Yoshiyuki Tagawa, John W. M. Bush","doi":"10.1103/physrevfluids.9.093603","DOIUrl":"https://doi.org/10.1103/physrevfluids.9.093603","url":null,"abstract":"In recent experiments, [E. Sawaguchi et al., J. Fluid Mech. 862, 261 (2019)] directly probed the lubrication layer of air beneath a droplet levitating inside a rotating cylindrical drum. For small rotation rates of the drum, the lubrication film beneath the drop adopted a steady shape, while at higher rotation rates, traveling waves propagated along the drop's lower surface with roughly half the wall velocity. Here, we rationalize the physical origin of these waves. We begin with a simplified model of the lubrication flow beneath the droplet, and examine the linear stability of this base state to perturbations of the Tollmien-Schlichting type. Our developments lead to the Orr-Sommerfeld equation (OSE), whose eigenvalues give the growth rates and phase speeds of the perturbations. By considering wavelengths long relative to the lubrication film thickness, we solve the OSE perturbatively and so deduce the wavelength and phase velocity of the most unstable mode. We find satisfactory agreement between experiment and theory over the parameter regime considered in the laboratory.","PeriodicalId":20160,"journal":{"name":"Physical Review Fluids","volume":"36 1","pages":""},"PeriodicalIF":2.7,"publicationDate":"2024-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142268723","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Drainage-induced spontaneous film climbing in capillaries 引流诱导毛细血管自发爬膜

IF 2.7 3区物理与天体物理

Physical Review Fluids Pub Date : 2024-09-16 DOI: 10.1103/physrevfluids.9.094005

P. Pirdavari, H. Tran, Z. He, M. Y. Pack

引用次数: 0