Annual Review of Fluid Mechanics最新文献_第3页

Fluid Dynamics of Airtanker Firefighting 空中加油机灭火的流体动力学

IF 27.7 1区工程技术

Annual Review of Fluid Mechanics Pub Date : 2023-10-31 DOI: 10.1146/annurev-fluid-121021-041642

Dominique Legendre

{"title":"Fluid Dynamics of Airtanker Firefighting","authors":"Dominique Legendre","doi":"10.1146/annurev-fluid-121021-041642","DOIUrl":"https://doi.org/10.1146/annurev-fluid-121021-041642","url":null,"abstract":"Airtanker firefighting is the most spectacular tool used to fight wildland fires. However, it employs a rudimentary large-scale spraying technology operating at a high speed and a long distance from the target. This review gives an overview of the fluid dynamics processes that govern this practice, which are characterized by rich and varied physical phenomena. The liquid column penetration in the air, its large-scale fragmentation, and an intense surface atomization give shape to the rainfall produced by the airtanker and the deposition of the final product on the ground. The cloud dynamics is controlled by droplet breakup, evaporation, and wind dispersion. The process of liquid deposition onto the forest canopy is full of open questions of great interest for rainfall retention in vegetation. Of major importance, but still requiring investigation, is the role of the complex non-Newtonian viscoelastic and shear-thinning behavior of the retardant dropped to stop the fire propagation. The review describes the need for future research devoted to the subject.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":"3 7","pages":""},"PeriodicalIF":27.7,"publicationDate":"2023-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71417587","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

The Early Days and Rise of Turbulence Simulation 湍流模拟的早期和兴起

IF 27.7 1区工程技术

Annual Review of Fluid Mechanics Pub Date : 2023-10-10 DOI: 10.1146/annurev-fluid-120821-025116

John Kim, Anthony Leonard

引用次数: 0

Multiscale Velocity Gradients in Turbulence 湍流中的多尺度速度梯度

IF 27.7 1区工程技术

Annual Review of Fluid Mechanics Pub Date : 2023-10-10 DOI: 10.1146/annurev-fluid-121021-031431

Perry L. Johnson, Michael Wilczek

{"title":"Multiscale Velocity Gradients in Turbulence","authors":"Perry L. Johnson, Michael Wilczek","doi":"10.1146/annurev-fluid-121021-031431","DOIUrl":"https://doi.org/10.1146/annurev-fluid-121021-031431","url":null,"abstract":"Understanding and predicting turbulent flow phenomena remain a challenge for both theory and applications. The nonlinear and nonlocal character of small-scale turbulence can be comprehensively described in terms of the velocity gradients, which determine fundamental quantities like dissipation, enstrophy, and the small-scale topology of turbulence. The dynamical equation for the velocity gradient succinctly encapsulates the nonlinear physics of turbulence; it offers an intuitive description of a host of turbulence phenomena and enables establishing connections between turbulent dynamics, statistics, and flow structure. The consideration of filtered velocity gradients enriches this view to express the multiscale aspects of nonlinearity and flow structure in a formulation directly applicable to large-eddy simulations. Driven by theoretical advances together with growing computational and experimental capabilities, recent activities in this area have elucidated key aspects of turbulence physics and advanced modeling capabilities.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":"3 4","pages":""},"PeriodicalIF":27.7,"publicationDate":"2023-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49696788","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

Fluid-Elastic Interactions near Contact at Low Reynolds Number 低雷诺数下近接触流体-弹性相互作用

IF 27.7 1区工程技术

Annual Review of Fluid Mechanics Pub Date : 2023-10-10 DOI: 10.1146/annurev-fluid-120720-024426

Bhargav Rallabandi

引用次数: 1

Large-Scale Eddy-Mean Flow Interaction in the Earth's Extratropical Atmosphere 地球温带大气中大尺度涡旋-平均流相互作用

IF 27.7 1区工程技术

Annual Review of Fluid Mechanics Pub Date : 2023-10-03 DOI: 10.1146/annurev-fluid-121021-035602

Noboru Nakamura

引用次数: 0

The Dynamics of Jupiter's and Saturn's Weather Layers: A Synthesis After Cassini and Juno 木星和土星天气层的动力学:卡西尼号和朱诺号之后的综合

IF 27.7 1区工程技术

Annual Review of Fluid Mechanics Pub Date : 2023-10-03 DOI: 10.1146/annurev-fluid-121021-040058

Peter L. Read

{"title":"The Dynamics of Jupiter's and Saturn's Weather Layers: A Synthesis After Cassini and Juno","authors":"Peter L. Read","doi":"10.1146/annurev-fluid-121021-040058","DOIUrl":"https://doi.org/10.1146/annurev-fluid-121021-040058","url":null,"abstract":"Until recently, observations of the giant planets of our Solar System were confined to sampling relatively shallow regions of their atmospheres, leaving many uncertainties as to the dynamics of deeper layers. The Cassini and Juno missions to Saturn and Jupiter, however, have begun to address these issues, for example, by measuring their gravity and magnetic fields. The results show that the zonally coherent jets and cloud bands extend to levels where the electrical conductivity of the fluid becomes significant, whereas large-scale vortices, such as the Great Red Spot, are relatively shallow but may have deep-seated roots. The polar regions also exhibit intense cyclonic vortices that, on Jupiter, arrange themselves into remarkably regular “vortex crystals.” Numerical models seem able to capture some of this complexity, but many issues remain unresolved, suggesting a need for models that can represent both deep and shallow processes sufficiently realistic ally to compare with observations.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 6","pages":""},"PeriodicalIF":27.7,"publicationDate":"2023-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49697134","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

Building Ventilation: The Consequences for Personal Exposure 建筑物通风:个人暴露的后果

IF 27.7 1区工程技术

Annual Review of Fluid Mechanics Pub Date : 2023-10-03 DOI: 10.1146/annurev-fluid-120720-015857

Rajesh K. Bhagat, Stuart B. Dalziel, M.S. Davies Wykes, P.F. Linden

{"title":"Building Ventilation: The Consequences for Personal Exposure","authors":"Rajesh K. Bhagat, Stuart B. Dalziel, M.S. Davies Wykes, P.F. Linden","doi":"10.1146/annurev-fluid-120720-015857","DOIUrl":"https://doi.org/10.1146/annurev-fluid-120720-015857","url":null,"abstract":"Ventilation is central to human civilization. Without it, the indoor environment rapidly becomes uncomfortable or dangerous, but too much ventilation can be expensive. We spend much of our time indoors, where we are exposed to pollutants and can be infected by airborne diseases. Ventilation removes pollution and bioaerosols from indoor sources but also brings in pollution from outdoors. To determine an appropriate level of ventilation and an appropriate way of providing it, one must understand that the needs for ventilation extend beyond simple thermal comfort; the quality of indoor air is at least as important. An effective ventilation system will remove unwanted contaminants, whether generated within the space by activities or by the simple act of breathing, and ensure that the ventilation system does not itself introduce or spread contaminants from elsewhere. This review explores how ventilation flow in buildings influences personal exposure to indoor pollutants and the spread of airborne diseases.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 10","pages":""},"PeriodicalIF":27.7,"publicationDate":"2023-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49697131","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

Bubble Plumes in Nature 自然界中的气泡羽流

IF 27.7 1区工程技术

Annual Review of Fluid Mechanics Pub Date : 2023-10-03 DOI: 10.1146/annurev-fluid-120720-011833

Silvana S.S. Cardoso, Julyan H.E. Cartwright

引用次数: 0

The Fluid Mechanics of Female Reproduction: A Review of the Biofluid Mechanics of Pregnancy and Delivery 女性生殖的流体力学:妊娠和分娩的生物流体力学综述

IF 27.7 1区工程技术

Annual Review of Fluid Mechanics Pub Date : 2023-09-27 DOI: 10.1146/annurev-fluid-121021-033738

Megan C. Leftwich, Alexa C. Baumer

{"title":"The Fluid Mechanics of Female Reproduction: A Review of the Biofluid Mechanics of Pregnancy and Delivery","authors":"Megan C. Leftwich, Alexa C. Baumer","doi":"10.1146/annurev-fluid-121021-033738","DOIUrl":"https://doi.org/10.1146/annurev-fluid-121021-033738","url":null,"abstract":"Reproductive biomechanics, a broad and developing field, contains fluid mechanics problems at every stage. In particular, the human female reproductive system is a complex and dynamic fluid-structure system. Until recently, the majority of this research focused on the early moments of reproduction—namely, the transport phenomena that dominate fertilization and implantation. However, in the past two decades, fluid mechanics has begun to be used in investigations of all aspects surrounding pregnancy, labor, and delivery. In this review, we discuss human reproduction starting with the nonpregnant uterus through implantation, delivery, and lactation and breastfeeding. We cover physiologic changes from the transformation of the uterus and the cervical remodeling process to the development of the placenta and the beginning of lactation. We examine the role of reproductive fluids such as amniotic fluid and vernix caseosa, and how force is transferred during labor.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":"2 10","pages":""},"PeriodicalIF":27.7,"publicationDate":"2023-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49697176","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

Vortices and Forces in Biological Flight: Insects, Birds, and Bats 生物飞行中的涡旋和力:昆虫、鸟类和蝙蝠

IF 27.7 1区工程技术

Annual Review of Fluid Mechanics Pub Date : 2023-09-22 DOI: 10.1146/annurev-fluid-120821-032304

Hao Liu, Shizhao Wang, Tianshu Liu

{"title":"Vortices and Forces in Biological Flight: Insects, Birds, and Bats","authors":"Hao Liu, Shizhao Wang, Tianshu Liu","doi":"10.1146/annurev-fluid-120821-032304","DOIUrl":"https://doi.org/10.1146/annurev-fluid-120821-032304","url":null,"abstract":"Insects, birds, and bats that power and control flight by flapping their wings perform excellent flight stability and maneuverability by rapidly and continuously varying their wing motions. This article provides an overview of the state of the art of vortex-dominated, unsteady flapping aerodynamics from the viewpoint of diversity and uniformity associated with dominant vortices, particularly of the relevant physical aspects of the flight of insects and vertebrates in the low- and intermediate-Reynolds-number ( Re) regime of 100 to 106. After briefly describing wing morphology and kinematics, we discuss the main vortices generated by flapping wings and the aerodynamic forces associated with these structures, focusing on leading-edge vortices (LEVs), wake vortices, and vortices generated by wing motions over a broad Re range. The LEVs are intensified by dynamic wing morphing in bird and bat flight, producing a significantly elevated vortex lift. The complex wake vortices are the footprints of lift generation; thus, the time-averaged vortex lift can be estimated from wake velocity data. Computational fluid dynamics modeling, quasi-steady models, and vortex lift models are useful tools to elucidate the intrinsic relationships between the lift and the dominant vortices in the near- and far-fields in flapping flight.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":"7 12","pages":""},"PeriodicalIF":27.7,"publicationDate":"2023-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49697551","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