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Modelisation Et Simulations En Turbulence Homogene Anisotrope
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Book Synopsis Simulation and Modeling of Turbulent Flows by : Thomas B. Gatski
Download or read book Simulation and Modeling of Turbulent Flows written by Thomas B. Gatski and published by Oxford University Press. This book was released on 1996-07-11 with total page 329 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides students and researchers in fluid engineering with an up-to-date overview of turbulent flow research in the areas of simulation and modeling. A key element of the book is the systematic, rational development of turbulence closure models and related aspects of modern turbulent flow theory and prediction. Starting with a review of the spectral dynamics of homogenous and inhomogeneous turbulent flows, succeeding chapters deal with numerical simulation techniques, renormalization group methods and turbulent closure modeling. Each chapter is authored by recognized leaders in their respective fields, and each provides a thorough and cohesive treatment of the subject.
Book Synopsis Modélisation Du Transport en Turbulence Homogène by : Antoine Briard
Download or read book Modélisation Du Transport en Turbulence Homogène written by Antoine Briard and published by . This book was released on 2017 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Modelling is essential to understand and reproduce the dominant physical mechanisms occurring in natural turbulent flows such as atmospheric and oceanic ones. Indeed, the dynamics of geophysical flows results of multiple complex processes interacting with each others, at various scales, intensities, and on different characteristic times. The fine description of such flows is currently out of reach of direct numerical simulations, notably because of Reynolds numbers limitations. Consequently, we address in this thesis the modelling of homogeneous turbulence, using the spectral formalism of the eddy-damped quasi-normal Markovian (EDQNM) approximation. This first allows us to obtain results rapidly in terms of computational resources at very large Reynolds numbers, and thus to investigate separately some of the fundamental mechanisms at stake in natural turbulent flows, namely shear, mean temperature gradient, stratification, helicity, and combinations of these processes. In this framework, a two-step approach is considered: first, EDQNM is used to close the non-linear terms in the second-order moments equations, and anisotropy is then modelled through spherically-averaged tensors. This methodology is applied to the various configurations mentioned above, permits to propose new theoretical results, and to assess them numerically at large Reynolds numbers. Among the most important findings, we focused on (i) the prediction of the decay and growth laws of crucial one-point statistics such as the kinetic energy, the scalar variance, and helicity; (ii) the determination of spectral scalings; and (iii) the scale by scale distribution of anisotropy.
Book Synopsis Statistical Theory and Modeling for Turbulent Flows by : P. A. Durbin
Download or read book Statistical Theory and Modeling for Turbulent Flows written by P. A. Durbin and published by John Wiley & Sons. This book was released on 2011-06-28 with total page 347 pages. Available in PDF, EPUB and Kindle. Book excerpt: Providing a comprehensive grounding in the subject of turbulence, Statistical Theory and Modeling for Turbulent Flows develops both the physical insight and the mathematical framework needed to understand turbulent flow. Its scope enables the reader to become a knowledgeable user of turbulence models; it develops analytical tools for developers of predictive tools. Thoroughly revised and updated, this second edition includes a new fourth section covering DNS (direct numerical simulation), LES (large eddy simulation), DES (detached eddy simulation) and numerical aspects of eddy resolving simulation. In addition to its role as a guide for students, Statistical Theory and Modeling for Turbulent Flows also is a valuable reference for practicing engineers and scientists in computational and experimental fluid dynamics, who would like to broaden their understanding of fundamental issues in turbulence and how they relate to turbulence model implementation. Provides an excellent foundation to the fundamental theoretical concepts in turbulence. Features new and heavily revised material, including an entire new section on eddy resolving simulation. Includes new material on modeling laminar to turbulent transition. Written for students and practitioners in aeronautical and mechanical engineering, applied mathematics and the physical sciences. Accompanied by a website housing solutions to the problems within the book.
Book Synopsis Homogeneous Turbulence Dynamics by : Pierre Sagaut
Download or read book Homogeneous Turbulence Dynamics written by Pierre Sagaut and published by Springer. This book was released on 2018-03-23 with total page 912 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides state-of-the-art results and theories in homogeneous turbulence, including anisotropy and compressibility effects with extension to quantum turbulence, magneto-hydodynamic turbulence and turbulence in non-newtonian fluids. Each chapter is devoted to a given type of interaction (strain, rotation, shear, etc.), and presents and compares experimental data, numerical results, analysis of the Reynolds stress budget equations and advanced multipoint spectral theories. The role of both linear and non-linear mechanisms is emphasized. The link between the statistical properties and the dynamics of coherent structures is also addressed. Despite its restriction to homogeneous turbulence, the book is of interest to all people working in turbulence, since the basic physical mechanisms which are present in all turbulent flows are explained. The reader will find a unified presentation of the results and a clear presentation of existing controversies. Special attention is given to bridge the results obtained in different research communities. Mathematical tools and advanced physical models are detailed in dedicated chapters.
Book Synopsis Fundamentals of Turbulence for Turbulence Modeling and Simulation by : W. C. Reynolds
Download or read book Fundamentals of Turbulence for Turbulence Modeling and Simulation written by W. C. Reynolds and published by . This book was released on 1987 with total page 66 pages. Available in PDF, EPUB and Kindle. Book excerpt: Topics include: Fundamentals of fluid motion -- Kinematics of motion, Constitutive equations, and Vorticity dynamics; Turbulence equations; Statistical descriptions of homogeneous turbulence; Rapid distortion of homogeneous turbulence; Modeling scale evolution in homogeneous turbulence; Modeling anisotropy in homogeneous turbulence; and Numerical simulations of turbulence.
Book Synopsis Direct and Large Eddy Simulation of Turbulence by : NA Schumann
Download or read book Direct and Large Eddy Simulation of Turbulence written by NA Schumann and published by Springer Science & Business Media. This book was released on 2013-04-17 with total page 350 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume contains papers presented to a EUROMECH-Colloquium held in Munich, September 30 to October 2, 1985. The Colloquium is number 199 in a series of colloquia inaugurated by the European Mechanics Committee. The meeting was jointly organized by the 'Lehrstuhl fur Stromungsmechanik' at the 'Technische Universitat Munchen' and the 'Institut fur Physik der Atmosphare' of the 'Deutsche Forschungs- und Versuchsanstalt fur Luft- und Raumfahrt' (DFVLR) in Oberpfaffenhofen. 'Direct' and 'large eddy simulation' are terms which denote two closely con nected methods of turbulence research. In a 'direct simulation' (DS), turbu lent motion is simulated by numerically integrating the Navier-Stokes equations in three-dimensional space and as a function of time. Besides ini tial and boundary conditions no physical simplifications are involved. Com puter resources limit the resolution in time and space, though simulations with an order of one million discrete points in space are feasible. The simu lated flow fields can be considered as true realizations of turbulent flow fields and analysed to answer questions on the basic behaviour of turbulence. Direct simulations are valid as long as all the excited scales remain within the band of resolved scales. This means that viscosity must be strong enough to damp out the not resolved scales or the simulation is restricted to a lim ited integration-time interval only. In summary, DS provides a tool to investigate turbulent motions from first principles at least for a finite band of scales.
Book Synopsis Modeling Complex Turbulent Flows by : Manuel D. Salas
Download or read book Modeling Complex Turbulent Flows written by Manuel D. Salas and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 385 pages. Available in PDF, EPUB and Kindle. Book excerpt: Turbulence modeling both addresses a fundamental problem in physics, 'the last great unsolved problem of classical physics,' and has far-reaching importance in the solution of difficult practical problems from aeronautical engineering to dynamic meteorology. However, the growth of supercom puter facilities has recently caused an apparent shift in the focus of tur bulence research from modeling to direct numerical simulation (DNS) and large eddy simulation (LES). This shift in emphasis comes at a time when claims are being made in the world around us that scientific analysis itself will shortly be transformed or replaced by a more powerful 'paradigm' based on massive computations and sophisticated visualization. Although this viewpoint has not lacked ar ticulate and influential advocates, these claims can at best only be judged premature. After all, as one computational researcher lamented, 'the com puter only does what I tell it to do, and not what I want it to do. ' In turbulence research, the initial speculation that computational meth ods would replace not only model-based computations but even experimen tal measurements, have not come close to fulfillment. It is becoming clear that computational methods and model development are equal partners in turbulence research: DNS and LES remain valuable tools for suggesting and validating models, while turbulence models continue to be the preferred tool for practical computations. We believed that a symposium which would reaffirm the practical and scientific importance of turbulence modeling was both necessary and timely.
Book Synopsis Modélisation et simulations en turbulence homogène anisotrope by : Benjamin Favier
Download or read book Modélisation et simulations en turbulence homogène anisotrope written by Benjamin Favier and published by . This book was released on 2010 with total page 186 pages. Available in PDF, EPUB and Kindle. Book excerpt: Cette thèse s’intéresse à la turbulence incompressible homogène et anisotrope, et plus particulièrement à l’effet d’une rotation solide et d’un champ magnétique uniforme et stationnaire. En plus des simulations numériques directes (DNS), nous présentons également un modèle synthétique de turbulence (Kinematic Simulation ou KS) construit à partir d’une superposition de modes de Fourier, et au sein duquel la dynamique linéaire (basée sur la Rapid Distorsion Theory) peut être incluse. Dans un premier temps, l’effet de la rotation solide est étudié avec un effort particulier porté sur les corrélations en deux-temps. Une comparaison entre DNS et KS est proposée dans le cas isotrope comme dans le cas en rotation. Dans le contexte aéroacoustique, on montre dans quelle mesure la rotation modifie l’émission acoustique d’une turbulence homogène. L’effet d’un champ magnétique est ensuite considéré et l’anisotropie de l’écoulement est étudiée en fonction du nombre de Reynolds magnétique. Il est montré dans quelle mesure la turbulence magnétohydrodynamique quasi-statique est similaire à la turbulence “deux-dimensions trois-composantes” du fait de la dissipation Joule anisotrope et comment l’écoulement restaure son isotropie lorsque le nombre de Reynolds magnétique croît. Enfin, l’effet couplé d’une rotation et d’un champ magnétique est considéré. Les propriétés énergétiques ainsi que l’anisotropie sont étudiés et une étude paramétrique en fonction du nombre d’Elsasser est proposée.
Book Synopsis Numerical Experiments in Homogeneous Turbulence by : Robert Sugden Rogallo
Download or read book Numerical Experiments in Homogeneous Turbulence written by Robert Sugden Rogallo and published by . This book was released on 1981 with total page 98 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Turbulence and Transition Modelling by : M. Hallbäck
Download or read book Turbulence and Transition Modelling written by M. Hallbäck and published by Springer Science & Business Media. This book was released on 2013-03-09 with total page 379 pages. Available in PDF, EPUB and Kindle. Book excerpt: The aim of this book is to give, within a single volume, an introduction to the fields of turbulence modelling and transition-to-turbulence prediction, and to provide the physical background for today's modelling approaches in these problem areas as well as giving a flavour of advanced use of prediction methods. Turbulence modelling approaches, ranging from single-point models based on the eddy-viscosity concept and the Reynolds stress transport equations (Chapters 3,4,5), to large-eddy simulation (LES) techniques (Ch. 7), are covered. The foundations of hydrodynamical stability and transition are presented (Ch. 2) along with transition prediction methods based on single-point closures (Ch. 6), LES techniques (Ch. 7) and the parabolized stability equations (Ch. 8). The book addresses engineers and researchers, in industry or academia, who are entering into the fields of turbulence or transition modelling research or need to apply turbulence or transition prediction methods in their work.
Book Synopsis Improved Turbulence Models Based on Large Eddy Simulation of Homogeneous, Incompressible, Turbulent Flows by : Stanford University. Thermosciences Division. Thermosciences Division
Download or read book Improved Turbulence Models Based on Large Eddy Simulation of Homogeneous, Incompressible, Turbulent Flows written by Stanford University. Thermosciences Division. Thermosciences Division and published by . This book was released on 1983 with total page 200 pages. Available in PDF, EPUB and Kindle. Book excerpt: The physical bases of large eddy simulation and the subgrid scale modeling it employs are studied in some detail. This investigation leads to a new scale-similarity model for the subgrid-scale turbulent Reynolds stresses.
Download or read book Turbulent Flows written by Jean Piquet and published by Springer Science & Business Media. This book was released on 2013-04-17 with total page 767 pages. Available in PDF, EPUB and Kindle. Book excerpt: obtained are still severely limited to low Reynolds numbers (about only one decade better than direct numerical simulations), and the interpretation of such calculations for complex, curved geometries is still unclear. It is evident that a lot of work (and a very significant increase in available computing power) is required before such methods can be adopted in daily's engineering practice. I hope to l"Cport on all these topics in a near future. The book is divided into six chapters, each· chapter in subchapters, sections and subsections. The first part is introduced by Chapter 1 which summarizes the equations of fluid mechanies, it is developed in C~apters 2 to 4 devoted to the construction of turbulence models. What has been called "engineering methods" is considered in Chapter 2 where the Reynolds averaged equations al"C established and the closure problem studied (§1-3). A first detailed study of homogeneous turbulent flows follows (§4). It includes a review of available experimental data and their modeling. The eddy viscosity concept is analyzed in §5 with the l"Csulting ~alar-transport equation models such as the famous K-e model. Reynolds stl"Css models (Chapter 4) require a preliminary consideration of two-point turbulence concepts which are developed in Chapter 3 devoted to homogeneous turbulence. We review the two-point moments of velocity fields and their spectral transforms (§ 1), their general dynamics (§2) with the particular case of homogeneous, isotropie turbulence (§3) whel"C the so-called Kolmogorov's assumptions are discussed at length.
Book Synopsis Fluid Mechanics of Planets and Stars by : Michael Le Bars
Download or read book Fluid Mechanics of Planets and Stars written by Michael Le Bars and published by Springer. This book was released on 2019-06-29 with total page 241 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book explores the dynamics of planetary and stellar fluid layers, including atmospheres, oceans, iron cores, and convective and radiative zones in stars, describing the different theoretical, computational and experimental methods used to study these problems in fluid mechanics, including the advantages and limitations of each method for different problems. This scientific domain is by nature interdisciplinary and multi-method, but while much effort has been devoted to solving open questions within the various fields of mechanics, applied mathematics, physics, earth sciences and astrophysics, and while much progress has been made within each domain using theoretical, numerical and experimental approaches, cross-fertilizations have remained marginal. Going beyond the state of the art, the book provides readers with a global introduction and an up-to-date overview of relevant studies, fully addressing the wide range of disciplines and methods involved. The content builds on the CISM course “Fluid mechanics of planets and stars”, held in April 2018, which was part of the research project FLUDYCO, supported by the European Research Council (ERC) under the European Union's Horizon 2020 research and innovation program.
Book Synopsis Transition, Turbulence and Combustion Modelling by : A. Hanifi
Download or read book Transition, Turbulence and Combustion Modelling written by A. Hanifi and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 540 pages. Available in PDF, EPUB and Kindle. Book excerpt: This single-volume work gives an introduction to the fields of transition, turbulence, and combustion modeling of compressible flows and provides the physical background for today’s modeling approaches in these fields. It presents basic equations and discusses fundamental aspects of hydrodynamical instability.
Book Synopsis Engineering Turbulence Modelling and Experiments 5 by : W. Rodi
Download or read book Engineering Turbulence Modelling and Experiments 5 written by W. Rodi and published by Elsevier. This book was released on 2002-08-21 with total page 1029 pages. Available in PDF, EPUB and Kindle. Book excerpt: Turbulence is one of the key issues in tackling engineering flow problems. As powerful computers and accurate numerical methods are now available for solving the flow equations, and since engineering applications nearly always involve turbulence effects, the reliability of CFD analysis depends increasingly on the performance of the turbulence models. This series of symposia provides a forum for presenting and discussing new developments in the area of turbulence modelling and measurements, with particular emphasis on engineering-related problems. The papers in this set of proceedings were presented at the 5th International Symposium on Engineering Turbulence Modelling and Measurements in September 2002. They look at a variety of areas, including: Turbulence modelling; Direct and large-eddy simulations; Applications of turbulence models; Experimental studies; Transition; Turbulence control; Aerodynamic flow; Aero-acoustics; Turbomachinery flows; Heat transfer; Combustion systems; Two-phase flows. These papers are preceded by a section containing 6 invited papers covering various aspects of turbulence modelling and simulation as well as their practical application, combustion modelling and particle-image velocimetry.
Book Synopsis Large Eddy Simulation for Incompressible Flows by : P. Sagaut
Download or read book Large Eddy Simulation for Incompressible Flows written by P. Sagaut and published by Springer Science & Business Media. This book was released on 2006 with total page 600 pages. Available in PDF, EPUB and Kindle. Book excerpt: First concise textbook on Large-Eddy Simulation, a very important method in scientific computing and engineering From the foreword to the third edition written by Charles Meneveau: "... this meticulously assembled and significantly enlarged description of the many aspects of LES will be a most welcome addition to the bookshelves of scientists and engineers in fluid mechanics, LES practitioners, and students of turbulence in general."
Book Synopsis Simulation and Modeling of the Decay of Anisotropic Turbulence by : Christopher J. Zusi
Download or read book Simulation and Modeling of the Decay of Anisotropic Turbulence written by Christopher J. Zusi and published by . This book was released on 2014 with total page 141 pages. Available in PDF, EPUB and Kindle. Book excerpt: The influence of turbulence structure, parameterized by two point correlations, on the return-to-isotropy process is examined under controlled conditions. In order to determine the influence of structure, direct numerical simulations (DNS) of return-to-isotropy in homogeneous, anisotropic turbulence is performed on meshes of 5123 and 512x512x1024. Isotropic turbulence is generated by mechanical stirring (as in a wind tunnel). Anisotropy is then generated by one of four fundamentally different mean strains, axisymmetric expansion and contraction, plane strain, and pure rotation. Each strain produces very different structure within the turbulence. The influence on the return-to-isotropy process of the initial structure (parameterized by the two-point correlations) as well as Reynolds number and initial length scale, is characterized and used to calibrate the Oriented-Eddy Collision (OEC) turbulence model developed by Martell and Perot [1]. In addition, this data provides critical information for other turbulence models which incorporate turbulence structure.
