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Annual Review of Fluid Mechanics最新文献

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Fluid Dynamics of Squirmers and Ciliated Microorganisms 蠕动体和纤毛微生物的流体动力学
IF 27.7 1区 工程技术
Annual Review of Fluid Mechanics Pub Date : 2023-09-22 DOI: 10.1146/annurev-fluid-121021-042929
Takuji Ishikawa
{"title":"Fluid Dynamics of Squirmers and Ciliated Microorganisms","authors":"Takuji Ishikawa","doi":"10.1146/annurev-fluid-121021-042929","DOIUrl":"https://doi.org/10.1146/annurev-fluid-121021-042929","url":null,"abstract":"The fluid dynamics of microswimmers has received attention from the fields of microbiology, microrobotics, and active matter. Microorganisms have evolved organelles termed cilia for propulsion through liquids. Each cilium periodically performs effective and recovery strokes, creating a metachronal wave as a whole and developing a propulsive force. One well-established mathematical model of ciliary swimming is the squirmer model, which focuses on surface squirming velocities. This model is also useful when studying active colloids and droplets. The squirmer model has been recently used to investigate the behaviors of microswimmers in complex environments, their collective dynamics, and the characteristics of active fluids. Efforts have also been made to broaden the range of applications beyond the assortment permitted by the squirmer model, which was established to specifically represent ciliary flow and incorporate biological features. The stress swimmer model imposes stresses above the cell body surface that enforce the no-slip condition. The ciliated swimmer model precisely reproduces the behaviors of each cilium that engages in mutual hydrodynamic interactions. Mathematical models have improved our understanding of various microbial phenomena, including cell–cell and cell–wall interactions and energetics. Here, I review recent advances in the hydrodynamics of ciliary swimming and then discuss future challenges.Expected final online publication date for the Annual Review of Fluid Mechanics, Volume 56 is January 2024. Please see http://www.annualreviews.org/page/journal/pubdates for revised estimates.","PeriodicalId":50754,"journal":{"name":"Annual Review of Fluid Mechanics","volume":"8 1","pages":""},"PeriodicalIF":27.7,"publicationDate":"2023-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49697550","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Flows Over Rotating Disks and Cones 流动在旋转的圆盘和锥上
IF 27.7 1区 工程技术
Annual Review of Fluid Mechanics Pub Date : 2023-09-15 DOI: 10.1146/annurev-fluid-121021-043651
P. Henrik Alfredsson, Kentaro Kato, R.J. Lingwood
{"title":"Flows Over Rotating Disks and Cones","authors":"P. Henrik Alfredsson, Kentaro Kato, R.J. Lingwood","doi":"10.1146/annurev-fluid-121021-043651","DOIUrl":"https://doi.org/10.1146/annurev-fluid-121021-043651","url":null,"abstract":"Rotating-disk flows were first considered by von Kármán in a seminal paper in 1921, where boundary layers in general were discussed and, in two of the nine sections, results for the laminar and turbulent boundary layers over a rotating disk were presented. It was not until in 1955 that flow visualization discovered the existence of stationary cross-flow vortices on the disk prior to the transition to turbulence. The rotating disk can be seen as a special case of rotating cones, and recent research has shown that broad cones behave similarly to disks, whereas sharp cones are susceptible to a different type of instability. Here, we provide a review of the major developments since von Kármán's work from 100 years ago, regarding instability, transition, and turbulence in the boundary layers, and we include some analysis not previously published.Expected final online publication date for the Annual Review of Fluid Mechanics, Volume 56 is January 2024. Please see http://www.annualreviews.org/page/journal/pubdates for revised estimates.","PeriodicalId":50754,"journal":{"name":"Annual Review of Fluid Mechanics","volume":"4 12","pages":""},"PeriodicalIF":27.7,"publicationDate":"2023-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49697661","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Turbulent Drag Reduction by Streamwise Traveling Waves of Wall-Normal Forcing 沿流行波的壁法向力减少湍流阻力
IF 27.7 1区 工程技术
Annual Review of Fluid Mechanics Pub Date : 2023-08-24 DOI: 10.1146/annurev-fluid-120720-021445
K. Fukagata, K. Iwamoto, Y. Hasegawa
{"title":"Turbulent Drag Reduction by Streamwise Traveling Waves of Wall-Normal Forcing","authors":"K. Fukagata, K. Iwamoto, Y. Hasegawa","doi":"10.1146/annurev-fluid-120720-021445","DOIUrl":"https://doi.org/10.1146/annurev-fluid-120720-021445","url":null,"abstract":"We review some fundamentals of turbulent drag reduction and the turbulent drag reduction techniques using streamwise traveling waves of blowing/suction from the wall and wall deformation. For both types of streamwise traveling wave controls, their significant drag reduction capabilities have been well confirmed by direct numerical simulation at relatively low Reynolds numbers. The drag reduction mechanisms by these streamwise traveling waves are considered to be the combination of direct effects due to pumping and indirect effects of the attenuation of velocity fluctuations due to reduced receptivity. Prediction of their drag reduction capabilities at higher Reynolds numbers and attempts for experimental validation are also intensively ongoing toward their practical implementation. Expected final online publication date for the Annual Review of Fluid Mechanics, Volume 56 is January 2024. Please see http://www.annualreviews.org/page/journal/pubdates for revised estimates.","PeriodicalId":50754,"journal":{"name":"Annual Review of Fluid Mechanics","volume":" ","pages":""},"PeriodicalIF":27.7,"publicationDate":"2023-08-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48683545","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Gas Microfilms in Droplet Dynamics: When Do Drops Bounce? 液滴动力学中的气体微膜:液滴何时反弹?
IF 27.7 1区 工程技术
Annual Review of Fluid Mechanics Pub Date : 2023-08-22 DOI: 10.1146/annurev-fluid-121021-021121
J. Sprittles
{"title":"Gas Microfilms in Droplet Dynamics: When Do Drops Bounce?","authors":"J. Sprittles","doi":"10.1146/annurev-fluid-121021-021121","DOIUrl":"https://doi.org/10.1146/annurev-fluid-121021-021121","url":null,"abstract":"In the last ten years, advances in experimental techniques have enabled remarkable discoveries of how the dynamics of thin gas films can profoundly influence the behavior of liquid droplets. Drops impacting onto solids can skate on a film of air so that they bounce off solids. For drop–drop collisions, this effect, which prevents coalescence, has been long recognized. Notably, the precise physical mechanisms governing these phenomena have been a topic of intense debate, leading to a synergistic interplay of experimental, theoretical, and computational approaches. This review attempts to synthesize our knowledge of when and how drops bounce, with a focus on ( a) the unconventional microscale and nanoscale physics required to predict transitions to/from merging and ( b) the development of computational models. This naturally leads to the exploration of an array of other topics, such as the Leidenfrost effect and dynamic wetting, in which gas films also play a prominent role. Expected final online publication date for the Annual Review of Fluid Mechanics, Volume 56 is January 2024. Please see http://www.annualreviews.org/page/journal/pubdates for revised estimates.","PeriodicalId":50754,"journal":{"name":"Annual Review of Fluid Mechanics","volume":" ","pages":""},"PeriodicalIF":27.7,"publicationDate":"2023-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45720858","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Interfacial Dynamics Pioneer Stephen H. Davis (1939–2021) 界面动力学先驱Stephen H.Davis（1939–2021）
IF 27.7 1区 工程技术
Annual Review of Fluid Mechanics Pub Date : 2023-08-17 DOI: 10.1146/annurev-fluid-121621-034932
M. Miksis, G. Neitzel, P. Voorhees
{"title":"Interfacial Dynamics Pioneer Stephen H. Davis (1939–2021)","authors":"M. Miksis, G. Neitzel, P. Voorhees","doi":"10.1146/annurev-fluid-121621-034932","DOIUrl":"https://doi.org/10.1146/annurev-fluid-121621-034932","url":null,"abstract":"Stephen H. Davis (1939–2021) was an applied mathematician, fluid dynamicist, and materials scientist who lead the field in his contributions to interfacial dynamics, thermal convection, thin films, and solidification for over 50 years. Here, we briefly review his personal and professional life and some of his most significant contributions to the field. Expected final online publication date for the Annual Review of Statistics and Its Application, Volume 11 is March 2024. Please see http://www.annualreviews.org/page/journal/pubdates for revised estimates.","PeriodicalId":50754,"journal":{"name":"Annual Review of Fluid Mechanics","volume":" ","pages":""},"PeriodicalIF":27.7,"publicationDate":"2023-08-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45335058","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Statistical Models for the Dynamics of Heavy Particles in Turbulence 湍流中重粒子动力学的统计模型
IF 27.7 1区 工程技术
Annual Review of Fluid Mechanics Pub Date : 2023-04-03 DOI: 10.1146/annurev-fluid-032822-014140
J. Bec, K. Gustavsson, B. Mehlig
{"title":"Statistical Models for the Dynamics of Heavy Particles in Turbulence","authors":"J. Bec, K. Gustavsson, B. Mehlig","doi":"10.1146/annurev-fluid-032822-014140","DOIUrl":"https://doi.org/10.1146/annurev-fluid-032822-014140","url":null,"abstract":"When very small particles are suspended in a fluid in motion, they tend to follow the flow. How such tracer particles are mixed, transported, and dispersed by turbulent flow has been successfully described by statistical models. Heavy particles, with mass densities larger than that of the carrying fluid, can detach from the flow. This results in preferential sampling, small-scale fractal clustering, and large collision velocities. To describe these effects of particle inertia, one must consider both particle positions and velocities in phase space. In recent years, statistical phase-space models have significantly contributed to our understanding of inertial-particle dynamics in turbulence. These models help to identify the key mechanisms and nondimensional parameters governing the particle dynamics and have made qualitative and, in some cases, quantitative predictions. This article reviews statistical phase-space models for the dynamics of small, yet heavy, spherical particles in turbulence. We evaluate their effectiveness by comparing their predictions with results from numerical simulations and laboratory experiments, and we summarize their successes and failures. Expected final online publication date for the Annual Review of Fluid Mechanics, Volume 56 is January 2024. Please see http://www.annualreviews.org/page/journal/pubdates for revised estimates.","PeriodicalId":50754,"journal":{"name":"Annual Review of Fluid Mechanics","volume":" ","pages":""},"PeriodicalIF":27.7,"publicationDate":"2023-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49632461","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
Gas–Particle Dynamics in High-Speed Flows 高速流动中的气体-颗粒动力学
IF 27.7 1区 工程技术
Annual Review of Fluid Mechanics Pub Date : 2023-03-01 DOI: 10.1146/annurev-fluid-121021-015818
J. Capecelatro, J. Wagner
{"title":"Gas–Particle Dynamics in High-Speed Flows","authors":"J. Capecelatro, J. Wagner","doi":"10.1146/annurev-fluid-121021-015818","DOIUrl":"https://doi.org/10.1146/annurev-fluid-121021-015818","url":null,"abstract":"High-speed disperse multiphase flows are present in numerous environmental and engineering applications with complex interactions between turbulence, shock waves, and particles. Compared with its incompressible counterpart, compressible two-phase flows introduce new scales of motion that challenge simulations and experiments. This review focuses on gas–particle interactions spanning subsonic to supersonic flow conditions. An overview of existing Mach-number-dependent drag laws is presented, with origins from eighteenth-century cannon firings and new insights from particle-resolved numerical simulations. The equations of motion and phenomenology for a single particle are first reviewed. Multiparticle systems spanning dusty gases to dense suspensions are then discussed from numerical and experimental perspectives. Expected final online publication date for the Annual Review of Fluid Mechanics, Volume 56 is January 2024. Please see http://www.annualreviews.org/page/journal/pubdates for revised estimates.","PeriodicalId":50754,"journal":{"name":"Annual Review of Fluid Mechanics","volume":" ","pages":""},"PeriodicalIF":27.7,"publicationDate":"2023-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42872689","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 5
Flow Computation Pioneer Irmgard Flügge-Lotz (1903–1974) 流计算先驱Irmgard flge - lotz (1903-1974)
1区 工程技术
Annual Review of Fluid Mechanics Pub Date : 2023-01-19 DOI: 10.1146/annurev-fluid-030822-112654
Jonathan B. Freund
{"title":"Flow Computation Pioneer Irmgard Flügge-Lotz (1903–1974)","authors":"Jonathan B. Freund","doi":"10.1146/annurev-fluid-030822-112654","DOIUrl":"https://doi.org/10.1146/annurev-fluid-030822-112654","url":null,"abstract":"Volumes of this journal typically include one or two historical articles, many of which celebrate the life and impact in fluid mechanics of a recently deceased contributor to the field. The Editorial Committee recently stepped beyond this model to examine whom might have been missed over the years. Naturally, even when a candidate is identified, the passing of time makes it hard to find authors with living memory of the subject. Fortunately, in the case of Professor Dr. Irmgard Flügge-Lotz there is a rare opportunity: An appropriate article appeared in the collection Women in Mathematics, coauthored by her first PhD student John Spreiter and her husband Wilhelm Flügge, both her colleagues at Stanford University. We republish this article to share her remarkable story and contributions in fluid mechanics, as she worked with Prandtl, led a research group at ONERA ( Office national d'études et de recherches aérospatiales), and eventually became the first woman professor of engineering at Stanford.","PeriodicalId":50754,"journal":{"name":"Annual Review of Fluid Mechanics","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135300967","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Transition to Turbulence in Pipe Flow 管道流动向湍流的过渡
1区 工程技术
Annual Review of Fluid Mechanics Pub Date : 2023-01-19 DOI: 10.1146/annurev-fluid-120720-025957
Marc Avila, Dwight Barkley, Björn Hof
{"title":"Transition to Turbulence in Pipe Flow","authors":"Marc Avila, Dwight Barkley, Björn Hof","doi":"10.1146/annurev-fluid-120720-025957","DOIUrl":"https://doi.org/10.1146/annurev-fluid-120720-025957","url":null,"abstract":"Since the seminal studies by Osborne Reynolds in the nineteenth century, pipe flow has served as a primary prototype for investigating the transition to turbulence in wall-bounded flows. Despite the apparent simplicity of this flow, various facets of this problem have occupied researchers for more than a century. Here we review insights from three distinct perspectives: ( a) stability and susceptibility of laminar flow, ( b) phase transition and spatiotemporal dynamics, and ( c) dynamical systems analysis of the Navier—Stokes equations. We show how these perspectives have led to a profound understanding of the onset of turbulence in pipe flow. Outstanding open points, applications to flows of complex fluids, and similarities with other wall-bounded flows are discussed.","PeriodicalId":50754,"journal":{"name":"Annual Review of Fluid Mechanics","volume":"257 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135250841","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 12
Particle Rafts and Armored Droplets 粒子筏和装甲液滴
IF 27.7 1区 工程技术
Annual Review of Fluid Mechanics Pub Date : 2023-01-19 DOI: 10.1146/annurev-fluid-030322-015150
S. Protière
{"title":"Particle Rafts and Armored Droplets","authors":"S. Protière","doi":"10.1146/annurev-fluid-030322-015150","DOIUrl":"https://doi.org/10.1146/annurev-fluid-030322-015150","url":null,"abstract":"Particles floating at interfaces are commonly observed in nature, as well as in industrial processes. When the particles are non-Brownian particles, large deformations of the interface are created that induce long-ranged capillary interactions and lead to the formation of particle rafts with unique characteristics. In this review we discuss recent efforts in investigating particle raft formation and the role of the rafts’ own weight during dynamic clustering. Under specific conditions, these rafts can ultimately collapse and sink. When subjected to external or internal forces, the raft undergoes large deformations that test the mechanical characteristics of this interfacial composite material. It can behave as a continuous elastic sheet under compression, although its discrete nature can also trigger its fragmentation via interparticle interactions. Finally, armored droplets, drops covered by a protective shell of particles, can lose their integrity when submitted to dynamic deformations, resulting in the ejection of particles or the fracturing of the armor. Open questions to understand the properties of this material are highlighted and future research to understand the fundamental physics of particle rafts, the customization of the cluster formation, or the disassembly of this collective material is suggested.","PeriodicalId":50754,"journal":{"name":"Annual Review of Fluid Mechanics","volume":"1079 ","pages":""},"PeriodicalIF":27.7,"publicationDate":"2023-01-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41271597","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 5
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