Turbulent Flow Simulations In 2d And 3d
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Turbulent Flow Simulations In 2d And 3d
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Author : De Goes Maciel Edisson Savio
language : en
Publisher: LAP Lambert Academic Publishing
Release Date : 2015-11-17
Turbulent Flow Simulations In 2d And 3d written by De Goes Maciel Edisson Savio and has been published by LAP Lambert Academic Publishing this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015-11-17 with categories.
This book was written to students and engineers that like the Computational Fluid Dynamics (CFD) area; in other words, that like of programming algorithms to the resolution of physical problems. Some familiarity with code programming is required. However, through the computation courses teaching at the Universities the engineering student and common areas will have the capacity of programming the codes and turbulence models presented in this book and much more of his/her interest. The engineers are understood with some experience in programming, therefore, the application of the algorithms is right. The applications of this book aim aeronautical and aerospace problems. This book describes nineteen turbulence models to be applied considering the perfect gas formulation. Zero-equation, one-equation, and two-equation models are studied, ranging from the zero-order model of Cebeci and Smith to the k-w non-linear two-equation model of Rumsey, Gatski, Ying and Bertelrud. Two and three-dimensional spaces are considered. The Van Leer and Liou and Steffen Jr. schemes are employed. Good results are obtained in both studies. A finite volume formulation and structured discretization is used.
Coarse Grained Simulation And Turbulent Mixing
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Author : Fernando F. Grinstein
language : en
Publisher: Cambridge University Press
Release Date : 2016-06-30
Coarse Grained Simulation And Turbulent Mixing written by Fernando F. Grinstein and has been published by Cambridge University Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016-06-30 with Technology & Engineering categories.
Small-scale turbulent flow dynamics is traditionally viewed as universal and as enslaved to that of larger scales. In coarse grained simulation (CGS), large energy-containing structures are resolved, smaller structures are spatially filtered out, and unresolved subgrid scale (SGS) effects are modeled. Coarse Grained Simulation and Turbulent Mixing reviews our understanding of CGS. Beginning with an introduction to the fundamental theory the discussion then moves to the crucial challenges of predictability. Next, it addresses verification and validation, the primary means of assessing accuracy and reliability of numerical simulation. The final part reports on the progress made in addressing difficult non-equilibrium applications of timely current interest involving variable density turbulent mixing. The book will be of fundamental interest to graduate students, research scientists, and professionals involved in the design and analysis of complex turbulent flows.
Study For The Validation Of Code Saturne For Turbulent Flow Simulations
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Author : Jordi Amat Foraster
language : en
Publisher:
Release Date : 2017
Study For The Validation Of Code Saturne For Turbulent Flow Simulations written by Jordi Amat Foraster and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017 with categories.
Nowadays, turbulent flows are of great interest in many applications because they mix fluid much more effectively than a comparable laminar flow due to its diffusivity. The conservation of the properties of the Navier-Stokes equations is of extremely importance for an accurate description of turbulent flows. This thesis analyzes the behavior of Code_Saturne, a multipurpose open-source CFD software package that is included in the Partnership for Advanced Computing in Europe (PRACE), in terms of kinetic energy conservation in turbulent flows. In order to do so, Code_Saturne is compared with a selfmade spectro-consistent 2D code and another spectro-consistent 3D code that exactly preserve the symmetries of the underlying differential operators of the Navier-Stokes equations, i.e. the convective operator is approximated by a skew-symmetric matrix and the diffusive operator by a symmetric, positive-definite matrix. The well known benchmark cases of the 2D Taylor vortex and the 3D Taylor-Green vortex are solved. A sensitivity analysis is performed in order to assess the best parameters of Code_Saturne that yield the best performance for both structured and unstructured meshes. The results show that Code_Saturne strictly conserves kinetic energy on regular Cartesian grids if an appropriate fully centered scheme is used together with the deactivation of the Rhie Chow interpolation. On 3D grids, the fully turbulent flow reveals that the presence of three dimensional effects due to vortex stretching causes a numerical dissipation that can be overcomed by refining the mesh size. However, this formulation does not allow to strictly preserve kinetic energy on unstructured grids due to the instabilities generated on the pressure gradient term. Finally, a set of configuration parameters that follow the aforementioned properties for Code_Saturne are provided.
Fluid Flow Phenomena
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Author : Paolo Orlandi
language : en
Publisher: Springer Science & Business Media
Release Date : 2012-12-06
Fluid Flow Phenomena written by Paolo Orlandi and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-12-06 with Science categories.
This book deals with the simulation of the incompressible Navier-Stokes equations for laminar and turbulent flows. The book is limited to explaining and employing the finite difference method. It furnishes a large number of source codes which permit to play with the Navier-Stokes equations and to understand the complex physics related to fluid mechanics. Numerical simulations are useful tools to understand the complexity of the flows, which often is difficult to derive from laboratory experiments. This book, then, can be very useful to scholars doing laboratory experiments, since they often do not have extra time to study the large variety of numerical methods; furthermore they cannot spend more time in transferring one of the methods into a computer language. By means of numerical simulations, for example, insights into the vorticity field can be obtained which are difficult to obtain by measurements. This book can be used by graduate as well as undergraduate students while reading books on theoretical fluid mechanics; it teaches how to simulate the dynamics of flow fields on personal computers. This will provide a better way of understanding the theory. Two chapters on Large Eddy Simulations have been included, since this is a methodology that in the near future will allow more universal turbulence models for practical applications. The direct simulation of the Navier-Stokes equations (DNS) is simple by finite-differences, that are satisfactory to reproduce the dynamics of turbulent flows. A large part of the book is devoted to the study of homogeneous and wall turbulent flows. In the second chapter the elementary concept of finite difference is given to solve parabolic and elliptical partial differential equations. In successive chapters the 1D, 2D, and 3D Navier-Stokes equations are solved in Cartesian and cylindrical coordinates. Finally, Large Eddy Simulations are performed to check the importance of the subgrid scale models. Results for turbulent and laminar flows are discussed, with particular emphasis on vortex dynamics. This volume will be of interest to graduate students and researchers wanting to compare experiments and numerical simulations, and to workers in the mechanical and aeronautic industries.
New Trends In Turbulence Turbulence Nouveaux Aspects
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Author : M. Lesieur
language : en
Publisher: Springer Science & Business Media
Release Date : 2003-07-01
New Trends In Turbulence Turbulence Nouveaux Aspects written by M. Lesieur and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2003-07-01 with Science categories.
Following a longstanding tradition of the Les Houches Summer Schools, this book uses a pedagogically presented and accessible style to treat 2D and 3D turbulence from the experimental, theoretical and computational points of view.
Computational Aerodynamics On Unstructed Meshes
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Author : Yun Zheng
language : en
Publisher:
Release Date : 2004
Computational Aerodynamics On Unstructed Meshes written by Yun Zheng and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2004 with categories.
New 2D and 3D unstructured-grid based flow solvers have been developed for simulating steady compressible flows for aerodynamic applications. The codes employ the full compressible Euler/Navier-Stokes equations. The Spalart-Al Imaras one equation turbulence model is used to model turbulence effects of flows. The spatial discretisation has been obtained using a cell-centred finite volume scheme on unstructured-grids, consisting of triangles in 2D and of tetrahedral and prismatic elements in 3D. The temporal discretisation has been obtained with an explicit multistage Runge-Kutta scheme. An "inflation" mesh generation technique is introduced to effectively reduce the difficulty in generating highly stretched 2D/3D viscous grids in regions near solid surfaces. The explicit flow method is accelerated by the use of a multigrid method with consideration of the high grid aspect ratio in viscous flow simulations. A solution mesh adaptation technique is incorporated to improve the overall accuracy of the 2D inviscid and viscous flow solutions. The 3D flow solvers are parallelised in a MIMD fashion aimed at a PC cluster system to reduce the computing time for aerodynamic applications. The numerical methods are first applied to several 2D inviscid flow cases, including subsonic flow in a bump channel, transonic flow around a NACA0012 airfoil and transonic flow around the RAE 2822 airfoil to validate the numerical algorithms. The rest of the 2D case studies concentrate on viscous flow simulations including laminar/turbulent flow over a flat plate, transonic turbulent flow over the RAE 2822 airfoil, and low speed turbulent flows in a turbine cascade with massive separations. The results are compared to experimental data to assess the accuracy of the method. The over resolved problem with mesh adaptation on viscous flow simulations is addressed with a two phase mesh reconstruction procedure. The solution convergence rate with the aspect ratio adaptive multigrid method and the direct connectivity based multigrid is assessed in several viscous turbulent flow simulations. Several 3D test cases are presented to validate the numerical algorithms for solving Euler/Navier-Stokes equations. Inviscid flow around the M6 wing airfoil is simulated on the tetrahedron based 3D flow solver with an upwind scheme and spatial second order finite volume method. The efficiency of the multigrid for inviscid flow simulations is examined. The efficiency of the parallelised 3D flow solver and the PC cluster system is assessed with simulations of the same case with different partitioning schemes. The present parallelised 3D flow solvers on the PC cluster system show satisfactory parallel computing performance. Turbulent flows over a flat plate are simulated with the tetrahedron based and prismatic based flow solver to validate the viscous term treatment. Next, simulation of turbulent flow over the M6 wing is carried out with the parallelised 3D flow solvers to demonstrate the overall accuracy of the algorithms and the efficiency of the multigrid method. The results show very good agreement with experimental data. A highly stretched and well-formed computational grid near the solid wall and wake regions is generated with the "inflation" method. The aspect ratio adaptive multigrid displayed a good acceleration rate. Finally, low speed flow around the NREL Phase 11 Wind turbine is simulated and the results are compared to the experimental data.
Turbulent Flows
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Author : G. Biswas
language : en
Publisher: CRC Press
Release Date : 2002
Turbulent Flows written by G. Biswas and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2002 with Technology & Engineering categories.
This book allows readers to tackle the challenges of turbulent flow problems with confidence. It covers the fundamentals of turbulence, various modeling approaches, and experimental studies. The fundamentals section includes isotropic turbulence and anistropic turbulence, turbulent flow dynamics, free shear layers, turbulent boundary layers and plumes. The modeling section focuses on topics such as eddy viscosity models, standard K-E Models, Direct Numerical Stimulation, Large Eddy Simulation, and their applications. The measurement of turbulent fluctuations experiments in isothermal and stratified turbulent flows are explored in the experimental methods section. Special topics include modeling of near wall turbulent flows, compressible turbulent flows, and more.
Simulation And Modeling Of Turbulent Flows
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Author : Thomas B. Gatski
language : en
Publisher: Oxford University Press
Release Date : 1996-07-11
Simulation And Modeling Of Turbulent Flows written by Thomas B. Gatski and has been published by Oxford University Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 1996-07-11 with Science categories.
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.
Two Dimensional Turbulent Flow Simulation
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Author : Bruce E. Larock
language : en
Publisher:
Release Date : 1982
Two Dimensional Turbulent Flow Simulation written by Bruce E. Larock and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1982 with categories.
Nearly all practical hydrologic flow problems are turbulent and, strictly speaking, three-dimensional. However, it is often an acceptable approximation for any of a variety of reasons (preliminary investigation; limits on expense, time or computing ability; prior knowledge; etc.) to reduce the dimensionality and/or the complexity of the flow representation. This article addresses the question of representing hydrologic flows as two-dimensional flows involving significant turbulent flow processes.
Numerical Simulations Of Laminar And Turbulent Mixing Layers Behind A Thin Airfoil
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Author : Saeed Rahbarimanesh
language : en
Publisher:
Release Date : 2015
Numerical Simulations Of Laminar And Turbulent Mixing Layers Behind A Thin Airfoil written by Saeed Rahbarimanesh and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015 with categories.