Annual Review of Fluid Mechanics最新文献_第5页

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

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

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

A Perspective on the State of Aerospace Computational Fluid Dynamics Technology 航空航天计算流体力学技术发展现状展望

IF 27.7 1区工程技术

Annual Review of Fluid Mechanics Pub Date : 2023-01-19 DOI: 10.1146/annurev-fluid-120720-124800

M. Mani, A. J. Dorgan

引用次数: 12

Elasto-Inertial Turbulence Elasto-Inertial动荡

1区工程技术

Annual Review of Fluid Mechanics Pub Date : 2023-01-19 DOI: 10.1146/annurev-fluid-032822-025933

Yves Dubief, Vincent E. Terrapon, Björn Hof

{"title":"Elasto-Inertial Turbulence","authors":"Yves Dubief, Vincent E. Terrapon, Björn Hof","doi":"10.1146/annurev-fluid-032822-025933","DOIUrl":"https://doi.org/10.1146/annurev-fluid-032822-025933","url":null,"abstract":"The dissolution of minute concentration of polymers in wall-bounded flows is well-known for its unparalleled ability to reduce turbulent friction drag. Another phenomenon, elasto-inertial turbulence (EIT), has been far less studied even though elastic instabilities have already been observed in dilute polymer solutions before the discovery of polymer drag reduction. EIT is a chaotic state driven by polymer dynamics that is observed across many orders of magnitude in Reynolds number. It involves energy transfer from small elastic scales to large flow scales. The investigation of the mechanisms of EIT offers the possibility to better understand other complex phenomena such as elastic turbulence and maximum drag reduction. In this review, we survey recent research efforts that are advancing the understanding of the dynamics of EIT. We highlight the fundamental differences between EIT and Newtonian/inertial turbulence from the perspective of experiments, numerical simulations, instabilities, and coherent structures. Finally, we discuss the possible links between EIT and elastic turbulence and polymer drag reduction, as well as the remaining challenges in unraveling the self-sustaining mechanism of EIT.","PeriodicalId":50754,"journal":{"name":"Annual Review of Fluid Mechanics","volume":"11 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":"135250842","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: 10

Cerebrospinal Fluid Flow. 脑脊液流动

IF 25.4 1区工程技术

Annual Review of Fluid Mechanics Pub Date : 2023-01-01 Epub Date: 2022-09-28 DOI: 10.1146/annurev-fluid-120720-011638

Douglas H Kelley, John H Thomas

引用次数: 0

Sharp Interface Methods for Simulation and Analysis of Free Surface Flows with Singularities: Breakup and Coalescence 具有奇点的自由表面流动模拟与分析的锐界面方法:破裂与聚并

IF 27.7 1区工程技术

Annual Review of Fluid Mechanics Pub Date : 2022-10-21 DOI: 10.1146/annurev-fluid-120720-014714

Christopher R. Anthony, Hansol Wee, Vishrut Garg, Sumeet S. Thete, Pritish M. Kamat, Brayden W. Wagoner, E. Wilkes, P. Notz, Alvin U. Chen, Ronald Suryo, Krishnaraj Sambath, J. Panditaratne, Y. Liao, O. Basaran

{"title":"Sharp Interface Methods for Simulation and Analysis of Free Surface Flows with Singularities: Breakup and Coalescence","authors":"Christopher R. Anthony, Hansol Wee, Vishrut Garg, Sumeet S. Thete, Pritish M. Kamat, Brayden W. Wagoner, E. Wilkes, P. Notz, Alvin U. Chen, Ronald Suryo, Krishnaraj Sambath, J. Panditaratne, Y. Liao, O. Basaran","doi":"10.1146/annurev-fluid-120720-014714","DOIUrl":"https://doi.org/10.1146/annurev-fluid-120720-014714","url":null,"abstract":"A common feature of many free surface flows—drop/bubble breakup or coalescence and film/sheet rupture—is the occurrence of hydrodynamic singularities. Accurately computing such flows with continuum mechanical, multidimensional free surface flow algorithms is a challenging task given these problems’ multiscale nature, which necessitates capturing dynamics occurring over disparate length scales across 5–6 orders of magnitude. In drop breakup, the thinning of fluid threads that form and eventually pinch-off must be simulated until the thread's radius is about 10 nm. When two drops approach one another, the thickness of the fluid film separating them must fall below 10 nm before coalescence is said to have occurred. If the initial drop radii are 1 mm, simulations must remain faithful to the physics as thread radius or film thickness falls from 10−3 m to below 10−8 m. Here we review significant findings in interfacial flows with hydrodynamic singularities spearheaded by sharp interface algorithms. These multidimensional algorithms can achieve resolution that to date has only been possible with the use of simple 1D evolution equations. Expected final online publication date for the Annual Review of Fluid Mechanics, Volume 55 is January 2023. 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":"2022-10-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47469011","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: 6

Turbulent Rotating Rayleigh–Bénard Convection 湍流旋转Rayleigh–Bénard对流

IF 27.7 1区工程技术

Annual Review of Fluid Mechanics Pub Date : 2022-10-20 DOI: 10.1146/annurev-fluid-120720-020446

R. Ecke, O. Shishkina

{"title":"Turbulent Rotating Rayleigh–Bénard Convection","authors":"R. Ecke, O. Shishkina","doi":"10.1146/annurev-fluid-120720-020446","DOIUrl":"https://doi.org/10.1146/annurev-fluid-120720-020446","url":null,"abstract":"Rotation with thermally induced buoyancy governs many astrophysical and geophysical processes in the atmosphere, ocean, sun, and Earth's liquid-metal outer core. Rotating Rayleigh–Bénard convection (RRBC) is an experimental system that has features of rotation and buoyancy, where a container of height H and temperature difference Δ between its bottom and top is rotated about its vertical axis with angular velocity Ω. The strength of buoyancy is reflected in the Rayleigh number (∼ H 3Δ) and that of the Coriolis force in the Ekman and Rossby numbers (∼Ω−1). Rotation suppresses the convective onset, introduces instabilities, changes the velocity boundary layers, modifies the shape of thermal structures from plumes to vortical columns, affects the large-scale circulation, and can decrease or enhance global heat transport depending on buoyant and Coriolis forcing. RRBC is an extremely rich system, with features directly comparable to geophysical and astrophysical phenomena. Here we review RRBC studies, suggest a unifying heat transport scaling approach for the transition between rotation-dominated and buoyancy-dominated regimes in RRBC, and discuss non-Oberbeck–Boussinesq and centrifugal effects. Expected final online publication date for the Annual Review of Fluid Mechanics, Volume 55 is January 2023. 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":"2022-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44425384","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: 23

Transition to Turbulence in Pipe Flow 管道流中向湍流的过渡

IF 27.7 1区工程技术

Annual Review of Fluid Mechanics Pub Date : 2022-10-20 DOI: 10.1007/1-4020-4049-0_12

B. Hof

引用次数: 8

Nonidealities in Rotating Detonation Engines 旋转爆震发动机中的非理想性

IF 27.7 1区工程技术

Annual Review of Fluid Mechanics Pub Date : 2022-10-20 DOI: 10.1146/annurev-fluid-120720-032612

V. Raman, S. Prakash, M. Gamba

{"title":"Nonidealities in Rotating Detonation Engines","authors":"V. Raman, S. Prakash, M. Gamba","doi":"10.1146/annurev-fluid-120720-032612","DOIUrl":"https://doi.org/10.1146/annurev-fluid-120720-032612","url":null,"abstract":"A rotating detonation engine (RDE) is a realization of pressure-gain combustion, wherein a traveling detonation wave confined in a chamber provides shock-based compression along with chemical heat release. Due to the high wave speeds, such devices can process high mass flow rates in small volumes, leading to compact and unconventional designs. RDEs involve unsteady and multiscale physics, and their operational characteristics are determined by an equilibrium between large- and small-scale processes. While RDEs can provide a significant theoretical gain in efficiency, achieving this improvement requires an understanding of the multiscale coupling. Specifically, unavoidable nonidealities, such as unsteady mixing, secondary combustion, and multiple competing waves associated with practical designs, need to be understood and managed. The secondary combustion processes arise from fuel/air injection and unsteady and incomplete mixing, and can create spurious losses. In addition, a combination of multiple detonation and secondary waves compete and define the dynamical behavior of mixing, heat release distribution, and the overall mode of operation of the device. This review discusses the current understanding of such nonidealities and describes the tools and techniques used to gain insight into the extreme unsteady environment in such combustors. Expected final online publication date for the Annual Review of Fluid Mechanics, Volume 55 is January 2023. 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":"2022-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46146277","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: 18