Annual Review of Fluid Mechanics最新文献_第8页

Fluid Dynamics of Axial Turbomachinery: Blade- and Stage-Level Simulations and Models 轴流式涡轮机械的流体动力学：叶片级和级级的仿真与模型

IF 27.7 1区工程技术

Annual Review of Fluid Mechanics Pub Date : 2021-10-13 DOI: 10.1146/annurev-fluid-031221-105530

R. Sandberg, V. Michelassi

{"title":"Fluid Dynamics of Axial Turbomachinery: Blade- and Stage-Level Simulations and Models","authors":"R. Sandberg, V. Michelassi","doi":"10.1146/annurev-fluid-031221-105530","DOIUrl":"https://doi.org/10.1146/annurev-fluid-031221-105530","url":null,"abstract":"The current generation of axial turbomachines are the culmination of decades of experience, and detailed understanding of the underlying flow physics has been a key factor for achieving high efficiency and reliability. Driven by advances in numerical methods and relentless growth in computing power, computational fluid dynamics has increasingly provided insights into the rich fluid dynamics involved and how it relates to loss generation. This article presents some of the complex flow phenomena occurring in bladed components of gas turbines and illustrates how simulations have contributed to their understanding and the challenges they pose for modeling. The interaction of key aerodynamic features with deterministic unsteadiness, caused by multiple blade rows, and stochastic unsteadiness, i.e., turbulence, is discussed. High-fidelity simulations of increasingly realistic configurations and models improved with help of machine learning promise to further grow turbomachinery performance and reliability and, thus, help fluid mechanics research have a greater industrial impact. Expected final online publication date for the Annual Review of Fluid Mechanics, Volume 54 is January 2022. 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":"2021-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45546780","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: 19

Flood Inundation Prediction 洪水淹没预测

IF 27.7 1区工程技术

Annual Review of Fluid Mechanics Pub Date : 2021-10-13 DOI: 10.1146/annurev-fluid-030121-113138

P. Bates

引用次数: 48

Dynamic Mode Decomposition and Its Variants 动态模态分解及其变体

IF 27.7 1区工程技术

Annual Review of Fluid Mechanics Pub Date : 2021-10-05 DOI: 10.1146/annurev-fluid-030121-015835

P. Schmid

引用次数: 125

Mass Transfer at the Ocean–Atmosphere Interface: The Role of Wave Breaking, Droplets, and Bubbles 海洋-大气界面的传质:波浪破碎、液滴和气泡的作用

IF 27.7 1区工程技术

Annual Review of Fluid Mechanics Pub Date : 2021-09-29 DOI: 10.1146/annurev-fluid-030121-014132

L. Deike

{"title":"Mass Transfer at the Ocean–Atmosphere Interface: The Role of Wave Breaking, Droplets, and Bubbles","authors":"L. Deike","doi":"10.1146/annurev-fluid-030121-014132","DOIUrl":"https://doi.org/10.1146/annurev-fluid-030121-014132","url":null,"abstract":"Breaking waves modulate the transfer of energy, momentum, and mass between the ocean and atmosphere, controlling processes critical to the climate system, from gas exchange of carbon dioxide and oxygen to the generation of sea spray aerosols that can be transported in the atmosphere and serve as cloud condensation nuclei. The smallest components, i.e., drops and bubbles generated by breaking waves, play an outsize role. This fascinating problem is characterized by a wide range of length scales, from wind forcing the wave field at scales of 𝒪(1 km–0.1 m) to the dynamics of wave breaking at 𝒪(10–0.1 m); air bubble entrainment, dynamics, and dissolution in the water column at 𝒪(1 m–10 μm); and bubbles bursting at 𝒪(10 mm–1 μm), generating sea spray droplets at 𝒪(0.5 mm–0.5 μm) that are ejected into atmospheric turbulent boundary layers. I discuss recent progress to bridge these length scales, identifying the controlling processes and proposing a path toward mechanistic parameterizations of air–sea mass exchange that naturally accounts for sea state effects. Expected final online publication date for the Annual Review of Fluid Mechanics, Volume 54 is January 2022. 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":"2021-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47008851","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: 61

Particle-Laden Turbulence: Progress and Perspectives 粒子负载湍流:进展与展望

IF 27.7 1区工程技术

Annual Review of Fluid Mechanics Pub Date : 2021-09-28 DOI: 10.1146/annurev-fluid-030121-021103

L. Brandt, F. Coletti

{"title":"Particle-Laden Turbulence: Progress and Perspectives","authors":"L. Brandt, F. Coletti","doi":"10.1146/annurev-fluid-030121-021103","DOIUrl":"https://doi.org/10.1146/annurev-fluid-030121-021103","url":null,"abstract":"This review is motivated by the fast progress in our understanding of the physics of particle-laden turbulence in the last decade, partly due to the tremendous advances of measurement and simulation capabilities. The focus is on spherical particles in homogeneous and canonical wall-bounded flows. The analysis of recent data indicates that conclusions drawn in zero gravity should not be extrapolated outside of this condition, and that the particle response time alone cannot completely define the dynamics of finite-size particles. Several breakthroughs have been reported, mostly separately, on the dynamics and turbulence modifications of small inertial particles in dilute conditions and of large weakly buoyant spheres. Measurements at higher concentrations, simulations fully resolving smaller particles, and theoretical tools accounting for both phases are needed to bridge this gap and allow for the exploration of the fluid dynamics of suspensions, from laminar rheology and granular media to particulate turbulence. Expected final online publication date for the Annual Review of Fluid Mechanics, Volume 54 is January 2022. 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":"2021-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46518813","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: 105

Rotating Horizontal Convection 旋转水平对流

IF 27.7 1区工程技术

Annual Review of Fluid Mechanics Pub Date : 2021-09-23 DOI: 10.1146/annurev-fluid-030121-115729

B. Gayen, R. W. Griffiths

{"title":"Rotating Horizontal Convection","authors":"B. Gayen, R. W. Griffiths","doi":"10.1146/annurev-fluid-030121-115729","DOIUrl":"https://doi.org/10.1146/annurev-fluid-030121-115729","url":null,"abstract":"Global differences of temperature and buoyancy flux at the ocean surface are responsible for small-scale convection at high latitudes, global overturning, and the top-to-bottom density difference in the oceans. With planetary rotation the convection also contributes to the large-scale horizontal, geostrophic circulation, and it crucially involves a 3D linkage between the geostrophic circulation and vertical overturning. The governing dynamics of such a surface-forced convective flow are fundamentally different from Rayleigh–Bénard convection, and the role of buoyancy forcing in the oceans is poorly understood. Geostrophic balance adds to the constraints on transport in horizontal convection, as illustrated by experiments, theoretical scaling, and turbulence-resolving simulations for closed (mid-latitude) basins and an annulus or reentrant zonal (circumpolar) channel. In these geometries, buoyancy drives either horizontal mid-latitude gyre recirculations or a strong Antarctic Circumpolar Current, respectively, in addition to overturning. At large Rayleigh numbers the release of available potential energy by convection leads to turbulent mixing with a mixing efficiency approaching unity. Turbulence-resolving models are also revealing the relative roles of wind stress and buoyancy when there is mixed forcing, and in future work they need to include the effects of turbulent mixing due to energy input from tides. Expected final online publication date for the Annual Review of Fluid Mechanics, Volume 54 is January 2022. 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":"2021-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46893529","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

Drop Impact Dynamics: Impact Force and Stress Distributions 跌落冲击动力学：冲击力和应力分布

IF 27.7 1区工程技术

Annual Review of Fluid Mechanics Pub Date : 2021-09-23 DOI: 10.1146/annurev-fluid-030321-103941

Xiang Cheng, Ting-Pi Sun, L. Gordillo

{"title":"Drop Impact Dynamics: Impact Force and Stress Distributions","authors":"Xiang Cheng, Ting-Pi Sun, L. Gordillo","doi":"10.1146/annurev-fluid-030321-103941","DOIUrl":"https://doi.org/10.1146/annurev-fluid-030321-103941","url":null,"abstract":"Dynamic variables of drop impact such as force, drag, pressure, and stress distributions are key to understanding a wide range of natural and industrial processes. While the study of drop impact kinematics has been in constant progress for decades thanks to high-speed photography and computational fluid dynamics, research on drop impact dynamics has only peaked in the last 10 years. Here, we review how recent coordinated efforts of experiments, simulations, and theories have led to new insights on drop impact dynamics. Particularly, we consider the temporal evolution of the impact force in the early- and late-impact regimes, as well as spatiotemporal features of the pressure and shear-stress distributions on solid surfaces. We also discuss other factors, including the presence of water layers, air cushioning, and nonspherical drop geometry, and briefly review granular impact cratering by liquid drops as an example demonstrating the distinct consequences of the stress distributions of drop impact. Expected final online publication date for the Annual Review of Fluid Mechanics, Volume 54 is January 2022. 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":"2021-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43762275","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: 42

Spontaneous Aggregation of Convective Storms 对流风暴的自发聚集

IF 27.7 1区工程技术

Annual Review of Fluid Mechanics Pub Date : 2021-09-23 DOI: 10.1146/annurev-fluid-022421-011319

C. Muller, D. Yang, G. Craig, T. Cronin, B. Fildier, J. Haerter, C. Hohenegger, B. Mapes, D. Randall, S. Shamekh, S. Sherwood

引用次数: 21

Flow and Drop Transport Along Liquid-Infused Surfaces 沿液体填充表面的流动和液滴传输

IF 27.7 1区工程技术

Annual Review of Fluid Mechanics Pub Date : 2021-09-21 DOI: 10.1146/annurev-fluid-030121-113156

S. Hardt, G. McHale

{"title":"Flow and Drop Transport Along Liquid-Infused Surfaces","authors":"S. Hardt, G. McHale","doi":"10.1146/annurev-fluid-030121-113156","DOIUrl":"https://doi.org/10.1146/annurev-fluid-030121-113156","url":null,"abstract":"Liquid-infused surfaces (LISs) are composite solid–liquid surfaces with remarkable features such as liquid repellency, self-healing, and the suppression of fouling. This review focuses on the fluid mechanics on LISs, that is, the interaction of surfaces with a flow field and the behavior of drops on such surfaces. LISs can be characterized by an effective slip length that is closely related to their drag reduction property, which makes them suitable for several applications, especially for turbulent flows. Drag reduction, however, is compromised by failure mechanisms such as the drainage of lubricant from surface textures. The flow field can also sculpt the lubricant layer in a coupled self-organization process. For drops, the lubricant reduces drop pinning and increases drop mobility, but also results in a wetting ridge and the associated concept of an apparent contact angle. Design of LIS wettability and topography can induce low-friction drop motion, and drops can dynamically shape the lubricant ridges and film thickness. Expected final online publication date for the Annual Review of Fluid Mechanics, Volume 54 is January 2022. 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":"2021-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47737538","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: 33

Experiments in Surface Gravity–Capillary Wave Turbulence 表面重力-毛细管波湍流实验

IF 27.7 1区工程技术

Annual Review of Fluid Mechanics Pub Date : 2021-07-07 DOI: 10.1146/annurev-fluid-021021-102043

E. Falcon, N. Mordant

{"title":"Experiments in Surface Gravity–Capillary Wave Turbulence","authors":"E. Falcon, N. Mordant","doi":"10.1146/annurev-fluid-021021-102043","DOIUrl":"https://doi.org/10.1146/annurev-fluid-021021-102043","url":null,"abstract":"The last decade has seen a significant increase in the number of studies devoted to wave turbulence. Many deal with water waves, as modeling of ocean waves has historically motivated the development of weak turbulence theory, which addresses the dynamics of a random ensemble of weakly nonlinear waves in interaction. Recent advances in experiments have shown that this theoretical picture is too idealized to capture experimental observations. While gravity dominates much of the oceanic spectrum, waves observed in the laboratory are in fact gravity–capillary waves, due to the restricted size of wave basins. This richer physics induces many interleaved physical effects far beyond the theoretical framework, notably in the vicinity of the gravity–capillary crossover. These include dissipation, finite–system size effects, and finite nonlinearity effects. Simultaneous space-and-time-resolved techniques, now available, open the way for a much more advanced analysis of these effects. Expected final online publication date for the Annual Review of Fluid Mechanics, Volume 54 is January 2022. 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":"2021-07-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46164465","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: 41