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Prediction Of Transonic Vortex Flows Using Linear And Nonlinear Turbulent Eddy Viscosity Models
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Book Synopsis Prediction of Transonic Vortex Flows Using Linear and Nonlinear Turbulent Eddy Viscosity Models by : Robert E. Bartels
Download or read book Prediction of Transonic Vortex Flows Using Linear and Nonlinear Turbulent Eddy Viscosity Models written by Robert E. Bartels and published by . This book was released on 2000 with total page 38 pages. Available in PDF, EPUB and Kindle. Book excerpt: Threee-dimensional transonic flow over a delta wing is investigated with a focus on the effect of transition and influence of turbulence stress anisotropies. The performance of linear eddy viscosity models and an explicit algebraic stress model is assessed at the start of the vortex flow, and the results compared with experimental data. To assess the effect of transition location, computations that either fix transition or are fully turbulent are performed. To assess the effect of the turbulent stress ansiotropy, comparisons are made between predictions from the algebraic stress model and the linear eddy viscosity models. Both transition location and turbulent stress anisotropy significantly affect the 3D flow field. The most significant effect is found to be the modeling of transition location. At a Mach number of 0.90, the computed solution changes character from steady to unsteady depending on transition onset. Accounting for the anisotropies in the turbulent stresses also considerably impacts the flow, most notably in the outboard region of flow separation.
Author :National Aeronautics and Space Adm Nasa Publisher :Independently Published ISBN 13 :9781723748134 Total Pages :36 pages Book Rating :4.7/5 (481 download)
Book Synopsis Prediction of Transonic Vortex Flows Using Linear and Nonlinear Turbulent Eddy Viscosity Models by : National Aeronautics and Space Adm Nasa
Download or read book Prediction of Transonic Vortex Flows Using Linear and Nonlinear Turbulent Eddy Viscosity Models written by National Aeronautics and Space Adm Nasa and published by Independently Published. This book was released on 2018-09-16 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt: Three-dimensional transonic flow over a delta wing is investigated with a focus on the effect of transition and influence of turbulence stress anisotropies. The performance of linear eddy viscosity models and an explicit algebraic stress model is assessed at the start of vortex flow, and the results compared with experimental data. To assess the effect of transition location, computations that either fix transition or are fully turbulent are performed. To assess the effect of the turbulent stress anisotropy, comparisons are made between predictions from the algebraic stress model and the linear eddy viscosity models. Both transition location and turbulent stress anisotropy significantly affect the 3D flow field. The most significant effect is found to be the modeling of transition location. At a Mach number of 0.90, the computed solution changes character from steady to unsteady depending on transition onset. Accounting for the anisotropies in the turbulent stresses also considerably impacts the flow, most notably in the outboard region of flow separation.Bartels, Robert E. and Gatski, Thomas B.Langley Research CenterTRANSONIC FLOW; VORTICES; NONLINEARITY; EDDY VISCOSITY; THREE DIMENSIONAL FLOW; MATHEMATICAL MODELS; TURBULENCE EFFECTS; SEPARATED FLOW; POSITION (LOCATION); MACH NUMBER; FLOW DISTRIBUTION; DELTA WINGS; BOUNDARY LAYER SEPARATION; ANISOTROPY
Book Synopsis Turbulent Flow by : Peter S. Bernard
Download or read book Turbulent Flow written by Peter S. Bernard and published by John Wiley & Sons. This book was released on 2002-08-19 with total page 516 pages. Available in PDF, EPUB and Kindle. Book excerpt: Provides unique coverage of the prediction and experimentation necessary for making predictions. * Covers computational fluid dynamics and its relationship to direct numerical simulation used throughout the industry. * Covers vortex methods developed to calculate and evaluate turbulent flows. * Includes chapters on the state-of-the-art applications of research such as control of turbulence.
Book Synopsis Transonic Turbulent Flow Predictions With Two-Equation Turbulence Models by :
Download or read book Transonic Turbulent Flow Predictions With Two-Equation Turbulence Models written by and published by . This book was released on 1996 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Transonic Turbulent Flow Predictions with New Two-equation Turbulence Models by : William W.-W. Liou
Download or read book Transonic Turbulent Flow Predictions with New Two-equation Turbulence Models written by William W.-W. Liou and published by . This book was released on 1996 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Prediction Methods for Turbulent Flows by : Wolfgang Kollmann (mechanika)
Download or read book Prediction Methods for Turbulent Flows written by Wolfgang Kollmann (mechanika) and published by Hemisphere Pub. This book was released on 1980 with total page 482 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Status and Prospects of Computational Fluid Dynamics for Unsteady Transonic Viscous Flows by :
Download or read book Status and Prospects of Computational Fluid Dynamics for Unsteady Transonic Viscous Flows written by and published by . This book was released on 1984 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt: Applications of computational aerodynamics to aeronautical research, design, and analysis have increased rapidly over the past decade, and these applications offer significant benefits to aeroelasticians. This paper traces the past developments by means of a number of specific examples, and projects the trends over the next several years. The crucial factors that limit the present capabilities for unsteady analyses are identified; they include computer speed and memory, algorithm and solution methods, grid generation, turbulence modeling, vortex modeling, data processing, and coupling of the aerodynamic and structural dynamic analyses. The prospects for overcoming these limitations are presented, and many improvements appear to be readily attainable. If so, a complete and reliable numerical simulation of the unsteady, transonic viscous flow around a realistic fighter aircraft configuration could become possible within the next decade. The possibilities of using artificial intelligence concepts to hasten the achievement of this goal are also discussed. Key words include: Flutter predictions; Oscillating wings; and Unsteady computational aerodynamics.
Book Synopsis Numerical Prediction of Confined Turbulent Vortex Flows by : F. Boysan
Download or read book Numerical Prediction of Confined Turbulent Vortex Flows written by F. Boysan and published by . This book was released on 1981* with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Turbulent Flows written by G. Biswas and published by CRC Press. This book was released on 2002 with total page 478 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Book Synopsis Turbulence Structure and Vortex Dynamics by : J. C. Vassilicos
Download or read book Turbulence Structure and Vortex Dynamics written by J. C. Vassilicos and published by Cambridge University Press. This book was released on 2000 with total page 326 pages. Available in PDF, EPUB and Kindle. Book excerpt: Edited volume on turbulence, first published in 2000.
Book Synopsis Eddy Viscosity Model Selection for Transonic Turbulent Flows Using Shrinkage Regression by :
Download or read book Eddy Viscosity Model Selection for Transonic Turbulent Flows Using Shrinkage Regression written by and published by . This book was released on 2015 with total page 23 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Development of a One-equation Eddy Viscosity Turbulence Model for Application to Complex Turbulent Flows by : Timothy J. Wray
Download or read book Development of a One-equation Eddy Viscosity Turbulence Model for Application to Complex Turbulent Flows written by Timothy J. Wray and published by . This book was released on 2016 with total page 139 pages. Available in PDF, EPUB and Kindle. Book excerpt: Computational fluid dynamics (CFD) is routinely used in performance prediction and design of aircraft, turbomachinery, automobiles, and in many other industrial applications. Despite its wide range of use, deficiencies in its prediction accuracy still exist. One critical weakness is the accurate simulation of complex turbulent flows using the Reynolds-Averaged Navier-Stokes equations in conjunction with a turbulence model. The goal of this research has been to develop an eddy viscosity type turbulence model to increase the accuracy of flow simulations for mildly separated flows, flows with rotation and curvature effects, and flows with surface roughness. It is accomplished by developing a new zonal one-equation turbulence model which relies heavily on the flow physics; it is now known in the literature as the Wray-Agarwal one-equation turbulence model. The effectiveness of the new model is demonstrated by comparing its results with those obtained by the industry standard one-equation Spalart-Allmaras model and two-equation Shear-Stress-Transport k -- [omega] model and experimental data. Results for subsonic, transonic, and supersonic flows in and about complex geometries are presented. It is demonstrated that the Wray-Agarwal model can provide the industry and CFD researchers an accurate, efficient, and reliable turbulence model for the computation of a large class of complex turbulent flows.
Book Synopsis Transonic Viscous Flow Calculations for a Turbine Cascade with a Two Equation Turbulence Model by :
Download or read book Transonic Viscous Flow Calculations for a Turbine Cascade with a Two Equation Turbulence Model written by and published by . This book was released on 1989 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Applied Mechanics Reviews written by and published by . This book was released on 1978 with total page 540 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Turbulence Models and Their Application by : Tuncer Cebeci
Download or read book Turbulence Models and Their Application written by Tuncer Cebeci and published by Springer Science & Business Media. This book was released on 2003-12-04 with total page 140 pages. Available in PDF, EPUB and Kindle. Book excerpt: After a brief review of the more popular turbulence models, the author presents and discusses accurate and efficient numerical methods for solving the boundary-layer equations with turbulence models based on algebraic formulas (mixing length, eddy viscosity) or partial-differential transport equations. A computer program employing the Cebeci-Smith model and the k-e model for obtaining the solution of two-dimensional incompressible turbulent flows without separation is discussed in detail and is presented in the accompanying CD.
Book Synopsis Multiscale And Multiresolution Approaches In Turbulence by : Pierre Sagaut
Download or read book Multiscale And Multiresolution Approaches In Turbulence written by Pierre Sagaut and published by World Scientific. This book was released on 2006-06-19 with total page 356 pages. Available in PDF, EPUB and Kindle. Book excerpt: This unique book gives a general unified presentation of the use of the multiscale/multiresolution approaches in the field of turbulence. The coverage ranges from statistical models developed for engineering purposes to multiresolution algorithms for the direct computation of turbulence. It provides the only available up-to-date reviews dealing with the latest and most advanced turbulence models (including LES, VLES, hybrid RANS/LES, DES) and numerical strategies.The book aims at providing the reader with a comprehensive description of modern strategies for turbulent flow simulation, ranging from turbulence modeling to the most advanced multilevel numerical methods./a
Author :European Computational Aerodynamics Research Project Publisher :Friedr Vieweg & Sohn Verlagsgesellschaft ISBN 13 : Total Pages :616 pages Book Rating :4.F/5 ( download)
Book Synopsis ECARP by : European Computational Aerodynamics Research Project
Download or read book ECARP written by European Computational Aerodynamics Research Project and published by Friedr Vieweg & Sohn Verlagsgesellschaft. This book was released on 1997 with total page 616 pages. Available in PDF, EPUB and Kindle. Book excerpt:
