Annual Review of Fluid Mechanics最新文献_第2页

Coalescence Dynamics 凝聚动力学

IF 27.7 1区工程技术

Annual Review of Fluid Mechanics Pub Date : 2024-07-26 DOI: 10.1146/annurev-fluid-121021-044919

Jens Eggers, James E. Sprittles, Jacco H. Snoeijer

引用次数: 0

Asymmetries in Nominally Symmetric Flows 名义对称流量中的不对称现象

IF 27.7 1区工程技术

Annual Review of Fluid Mechanics Pub Date : 2024-07-26 DOI: 10.1146/annurev-fluid-030124-045719

Owen J.H. Williams, Alexander J. Smits

{"title":"Asymmetries in Nominally Symmetric Flows","authors":"Owen J.H. Williams, Alexander J. Smits","doi":"10.1146/annurev-fluid-030124-045719","DOIUrl":"https://doi.org/10.1146/annurev-fluid-030124-045719","url":null,"abstract":"Many flows that are expected to be symmetric are actually observed to be asymmetric. The appearance of asymmetry in the face of no particular cause is a widespread although underappreciated occurrence. This rather puzzling and sometimes frustrating phenomenon can occur in wide-angle diffusers, over the forebody of axisymmetric bodies at high angles of attack, in the wake downstream of streamlined as well as bluff bodies, and in the flow over three-dimensional bumps and ramps. We review some notable examples and highlight the extreme sensitivity of many such flows to small disturbances in the body geometry or the incoming flow. Some flows appear to be permanently asymmetric, while others are bistable on timescales that are orders of magnitude longer than any convective timescale. Convective or global instabilities can occur, bistability is common, and mode interactions become important when multiple similar but distinct timescales and length scales are present. Our understanding of these phenomena is still very limited, and further research is urgently required; asymmetries in otherwise symmetric flows can have serious real-world consequences on vehicle control and performance.","PeriodicalId":50754,"journal":{"name":"Annual Review of Fluid Mechanics","volume":"7 1","pages":""},"PeriodicalIF":27.7,"publicationDate":"2024-07-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141768537","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

Thermoacoustic Instability in Combustors 燃烧器中的热声不稳定性

IF 27.7 1区工程技术

Annual Review of Fluid Mechanics Pub Date : 2024-07-26 DOI: 10.1146/annurev-fluid-121021-032828

Aimee S. Morgans, Dong Yang

{"title":"Thermoacoustic Instability in Combustors","authors":"Aimee S. Morgans, Dong Yang","doi":"10.1146/annurev-fluid-121021-032828","DOIUrl":"https://doi.org/10.1146/annurev-fluid-121021-032828","url":null,"abstract":"Thermoacoustic instability is a flow instability that arises due to a two-way coupling between acoustic waves and unsteady heat release rate. It can cause damaging, large-amplitude oscillations in the combustors of gas turbines, aeroengines, rocket engines, etc., and the transition to decarbonized fuels is likely to introduce new thermoacoustic instability problems. With a focus on practical thermoacoustic instability problems, especially in gas turbine combustors, this review presents the common types of combustor and burner geometry used. It discusses the relevant flow physics underpinning their acoustic and unsteady flame behaviors, including how these differ across combustor and burner types. Computational tools for predicting thermoacoustic instability can be categorized into direct computational approaches, in which a single flow simulation resolves all of the most important length scales and timescales, and coupled/hybrid approaches, which couple separate computational treatments for the acoustic waves and flame, exploiting the large disparity in length scales associated with these. Examples of successful computational prediction of thermoacoustic instability in realistic combustors are given, along with outlooks for future research in this area.","PeriodicalId":50754,"journal":{"name":"Annual Review of Fluid Mechanics","volume":"66 1","pages":""},"PeriodicalIF":27.7,"publicationDate":"2024-07-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141768435","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

Naval Engineering Pioneer Raye J. Montague (1935–2018) 海军工程先驱雷伊-蒙塔古（1935-2018）

IF 27.7 1区工程技术

Annual Review of Fluid Mechanics Pub Date : 2024-07-18 DOI: 10.1146/annurev-fluid-040124-112941

Jaye Falls

引用次数: 0

Flow Mechanics in Ablative Thermal Protection Systems 烧蚀热保护系统中的流动力学

IF 27.7 1区工程技术

Annual Review of Fluid Mechanics Pub Date : 2024-01-19 DOI: 10.1146/annurev-fluid-030322-010557

Nagi N. Mansour, Francesco Panerai, Jean Lachaud, Thierry Magin

引用次数: 0

Nonideal Compressible Fluid Dynamics of Dense Vapors and Supercritical Fluids 致密蒸汽和超临界流体的非理想可压缩流体动力学

IF 27.7 1区工程技术

Annual Review of Fluid Mechanics Pub Date : 2024-01-19 DOI: 10.1146/annurev-fluid-120720-033342

Alberto Guardone, Piero Colonna, Matteo Pini, Andrea Spinelli

{"title":"Nonideal Compressible Fluid Dynamics of Dense Vapors and Supercritical Fluids","authors":"Alberto Guardone, Piero Colonna, Matteo Pini, Andrea Spinelli","doi":"10.1146/annurev-fluid-120720-033342","DOIUrl":"https://doi.org/10.1146/annurev-fluid-120720-033342","url":null,"abstract":"The gas dynamics of single-phase nonreacting fluids whose thermodynamic states are close to vapor-liquid saturation, close to the vapor-liquid critical point, or in supercritical conditions differs quantitatively and qualitatively from the textbook gas dynamics of dilute, ideal gases. Due to nonideal fluid thermodynamic properties, unconventional gas dynamic effects are possible, including nonclassical rarefaction shock waves and the nonmonotonic variation of the Mach number along steady isentropic expansions. This review provides a comprehensive theoretical framework of the fundamentals of nonideal compressible fluid dynamics (NICFD). The relation between nonideal gas dynamics and the complexity of the fluid molecules is clarified. The theoretical, numerical, and experimental tools currently employed to investigate NICFD flows and related applications are reviewed, followed by an overview of industrial processes involving NICFD, ranging from organic Rankine and supercritical CO2 cycle power systems to supercritical processes. The future challenges facing researchers in the field are briefly outlined.","PeriodicalId":50754,"journal":{"name":"Annual Review of Fluid Mechanics","volume":"17 1","pages":""},"PeriodicalIF":27.7,"publicationDate":"2024-01-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139504958","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

Molecular Mechanics of Liquid and Gas Slip Flow 液体和气体滑动流动的分子力学

IF 27.7 1区工程技术

Annual Review of Fluid Mechanics Pub Date : 2024-01-19 DOI: 10.1146/annurev-fluid-121021-014808

Nicolas G. Hadjiconstantinou

引用次数: 0

Advances in Modeling Dense Granular Media 致密颗粒介质建模的进展

IF 27.7 1区工程技术

Annual Review of Fluid Mechanics Pub Date : 2024-01-19 DOI: 10.1146/annurev-fluid-121021-022045

Ken Kamrin, Kimberly M. Hill, Daniel I. Goldman, Jose E. Andrade

引用次数: 0

Deformation and Breakup of Bubbles and Drops in Turbulence 湍流中气泡和液滴的变形和破裂

IF 27.7 1区工程技术

Annual Review of Fluid Mechanics Pub Date : 2023-11-28 DOI: 10.1146/annurev-fluid-121021-034541

Rui Ni

{"title":"Deformation and Breakup of Bubbles and Drops in Turbulence","authors":"Rui Ni","doi":"10.1146/annurev-fluid-121021-034541","DOIUrl":"https://doi.org/10.1146/annurev-fluid-121021-034541","url":null,"abstract":"Fragmentation of bubbles and droplets in turbulence produces a dispersed phase spanning a broad range of scales, encompassing everything from droplets in nanoemulsions to centimeter-sized bubbles entrained in breaking waves. Along with deformation, fragmentation plays a crucial role in enhancing interfacial area, with far-reaching implications across various industries, including food, pharmaceuticals, and ocean engineering. However, understanding and modeling these processes are challenging due to the complexity of anisotropic and inhomogeneous turbulence typically involved, the unknown residence time in regions with different turbulence intensities, and difficulties arising from the density and viscosity ratios. Despite these challenges, recent advances have provided new insights into the underlying physics of deformation and fragmentation in turbulence. This review summarizes existing works in various fields, highlighting key results and uncertainties, and examining the impact on turbulence modulation, drag reduction, and heat and mass transfer.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":"76 1","pages":""},"PeriodicalIF":27.7,"publicationDate":"2023-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138449706","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

Learning Nonlinear Reduced Models from Data with Operator Inference 利用算子推理从数据中学习非线性约简模型

IF 27.7 1区工程技术

Annual Review of Fluid Mechanics Pub Date : 2023-11-02 DOI: 10.1146/annurev-fluid-121021-025220

Boris Kramer, Benjamin Peherstorfer, Karen E. Willcox

{"title":"Learning Nonlinear Reduced Models from Data with Operator Inference","authors":"Boris Kramer, Benjamin Peherstorfer, Karen E. Willcox","doi":"10.1146/annurev-fluid-121021-025220","DOIUrl":"https://doi.org/10.1146/annurev-fluid-121021-025220","url":null,"abstract":"This review discusses Operator Inference, a nonintrusive reduced modeling approach that incorporates physical governing equations by defining a structured polynomial form for the reduced model, and then learns the corresponding reduced operators from simulated training data. The polynomial model form of Operator Inference is sufficiently expressive to cover a wide range of nonlinear dynamics found in fluid mechanics and other fields of science and engineering, while still providing efficient reduced model computations. The learning steps of Operator Inference are rooted in classical projection-based model reduction; thus, some of the rich theory of model reduction can be applied to models learned with Operator Inference. This connection to projection-based model reduction theory offers a pathway toward deriving error estimates and gaining insights to improve predictions. Furthermore, through formulations of Operator Inference that preserve Hamiltonian and other structures, important physical properties such as energy conservation can be guaranteed in the predictions of the reduced model beyond the training horizon. This review illustrates key computational steps of Operator Inference through a large-scale combustion example.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":"6 16","pages":""},"PeriodicalIF":27.7,"publicationDate":"2023-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71418005","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