Assessment Of An Explicit Algebraic Reynolds Stress Model

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Assessment of an Explicit Algebraic Reynolds Stress Model

Author : National Aeronautics and Space Administration (NASA)
Publisher : Createspace Independent Publishing Platform
ISBN 13 : 9781720386902
Total Pages : 36 pages
Book Rating : 4.3/5 (869 download)

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Book Synopsis Assessment of an Explicit Algebraic Reynolds Stress Model by : National Aeronautics and Space Administration (NASA)

Download or read book Assessment of an Explicit Algebraic Reynolds Stress Model written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-05-29 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt: This study assesses an explicit algebraic Reynolds stress turbulence model in the in the three-dimensional Reynolds averaged Navier-Stokes (RANS) solver, ISAAC (Integrated Solution Algorithm for Arbitrary Con gurations). Additionally, it compares solutions for two select configurations between ISAAC and the RANS solver PAB3D. This study compares with either direct numerical simulation data, experimental data, or empirical models for several different geometries with compressible, separated, and high Reynolds number flows. In general, the turbulence model matched data or followed experimental trends well, and for the selected configurations, the computational results of ISAAC closely matched those of PAB3D using the same turbulence model.Carlson, Jan-ReneeLangley Research CenterCOMPUTATIONAL FLUID DYNAMICS; REYNOLDS STRESS; NAVIER-STOKES EQUATION; REYNOLDS AVERAGING; TURBULENCE MODELS; DIRECT NUMERICAL SIMULATION; MATHEMATICAL MODELS; TRENDS

Assessment of an Explicit Algebraic Reynolds Stress Model

Author : Jan-Reneé Carlson
Publisher :
ISBN 13 :
Total Pages : 31 pages
Book Rating : 4.:/5 (694 download)

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Book Synopsis Assessment of an Explicit Algebraic Reynolds Stress Model by : Jan-Reneé Carlson

Download or read book Assessment of an Explicit Algebraic Reynolds Stress Model written by Jan-Reneé Carlson and published by . This book was released on 2005 with total page 31 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Progress in Propulsion Physics

Author : Luigi T. DeLuca
Publisher :
ISBN 13 : 9782759806744
Total Pages : 570 pages
Book Rating : 4.8/5 (67 download)

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Book Synopsis Progress in Propulsion Physics by : Luigi T. DeLuca

Download or read book Progress in Propulsion Physics written by Luigi T. DeLuca and published by . This book was released on 2012 with total page 570 pages. Available in PDF, EPUB and Kindle. Book excerpt: La péface indique : "EUCASS (European Conference for Aero-Space Sciences) is a scientific association at the service of research scientists, engineers, and decision makers active in aeronautical and space sciences. EUCASS, which is an international nonprofit association under the Belgian law, addresses all topics of interest to aerospace, from research challenges to long-term programmes and prospective. It organizes regular conferences, workshops, and meetings. Its goal is to attract the best specialists from Europe and elsewhere, and to create a commonwealth of interest and challenges where in-formation and ideas circulate freely and swiftly, where the currently scattered European knowledge is exchanged much faster and cross-fertilised. EUCASS is the cradle that nurtures a friendly and lively community spirit among all players. It started its activities in 2005 by organizing the first-ever European conference in Moscow, followed at a biennial rate in Brussels and Versailles. In order to contribute to the dissemination of scientific knowledge, we have launched this EUCASS Book Series, the first and second volumes of which were dedicated to Propulsion Physics and presented a selection of the lectures given in Brussels in July 2007. EUCASS is organized in several permanent Technical Committees (TC). One of them is the Flight Physics TC. Within the broad EUCASS framework, the specificc purpose of the Flight Physics TC is to promote the technology, sciences, and arts of Flight physics and to help those engaged in these pursuits to develop their skills and those of their students. This third volume of the EUCASS Book Series on Advances in Aerospace Sciences is dedicated to Flight Physics. It comprises a selected collection of 43 papers presented at the 3rd European Conference for Aerospace Sciences held in Versailles, France, July 06-10, 2009. The current volume is the result of a long review process. About 1/3 of the total number of papers accepted for presentation at the conference was later selected by the volume editors, then edited by an international body of peer reviewers. The volume includes six chapters covering experimental, theoretical and numerical aspects of the fight physics: Chapter One Aerodynamics, Chapter Two Shock Interaction, Chapter Three High Enthalphy Flows, Chapter Four Heat Transfer, Chapter Five Aeroacoustics, Chapter Six Flow Control. To easily identify the material of interest, the reader is invited to consult the brief paper summaries compiled at the start of each chapter."

Implementation of an Explicit Algebraic Reynolds Stress Model to Account for Curvature Effects

Author :
Publisher :
ISBN 13 :
Total Pages : 68 pages
Book Rating : 4.:/5 (924 download)

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Book Synopsis Implementation of an Explicit Algebraic Reynolds Stress Model to Account for Curvature Effects by :

Download or read book Implementation of an Explicit Algebraic Reynolds Stress Model to Account for Curvature Effects written by and published by . This book was released on 1997 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Fully-Explicit and Self-Consistent Algebraic Reynolds Stress Models

Author :
Publisher :
ISBN 13 :
Total Pages : 32 pages
Book Rating : 4.:/5 (317 download)

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Book Synopsis Fully-Explicit and Self-Consistent Algebraic Reynolds Stress Models by :

Download or read book Fully-Explicit and Self-Consistent Algebraic Reynolds Stress Models written by and published by . This book was released on 1995 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt:

On Explicit Algebraic Stress Models for Complex Turbulent Flows

Author : T. B. Gatski
Publisher :
ISBN 13 :
Total Pages : 40 pages
Book Rating : 4.:/5 (317 download)

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Book Synopsis On Explicit Algebraic Stress Models for Complex Turbulent Flows by : T. B. Gatski

Download or read book On Explicit Algebraic Stress Models for Complex Turbulent Flows written by T. B. Gatski and published by . This book was released on 1992 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Explicit Algebraic Subfilter Scale Modeling for DES-like Methods and Extension to Variable Density Flows

Author : Adithya Ramanathan Krishnan
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (115 download)

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Book Synopsis Explicit Algebraic Subfilter Scale Modeling for DES-like Methods and Extension to Variable Density Flows by : Adithya Ramanathan Krishnan

Download or read book Explicit Algebraic Subfilter Scale Modeling for DES-like Methods and Extension to Variable Density Flows written by Adithya Ramanathan Krishnan and published by . This book was released on 2019 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The aim of this work is to improve the predictive capabilities of hybrid RANS/LES methods HRLM through the development of a subfilter scale model which considers an explicit algebraic relation for the non-isotropic turbulent subfilter stress and turbulent scalar fluxes, contributing to the improvement of the safety analysis concerning hydrogen hazards. Firstly, an Explicit Algebraic Reynolds Stress Model EARSM is developed using the direct solution method and calibrated with Menter's BSL model for incompressible flows in a RANS framework. Secondly, the EARSM model is extended to seamless HRLM specifically in the framework of Equivalent-Detached Eddy Simulation, arriving at the Explicit Algebraic Hybrid Stress Model EAHSM. The calibration of the model constant is performed on the decay of isotropic turbulence. The validation is performed against the DNS data available in the literature for the fully developed Channel flow at a moderate friction Reynolds number of 550 and flow in a square pipe at a friction Reynolds number of 600. Finally, assuming the Boussinesq approximation to be valid, the developed EARSM and the EAHSM models are extended to slightly variable density flows. Following the direct solution of the implicit algebraic relationships, the explicit algebraic model for both the Reynolds stresses and the scalar flux is obtained in a RANS framework which leads to the Explicit Algebraic Scalar Flux Model(EASFM). An effective iterative solution method is used to treat the nonlinearity of the coupled expressions for the algebraic relations. The EASFM is extended to the framework of seamless HRLM. The behaviour of the models is assessed for stably stratified flows.

A Realizable Reynolds Stress Algebraic Equation Model

Author : Tsan-Hsing Shih
Publisher :
ISBN 13 :
Total Pages : 42 pages
Book Rating : 4.F/5 ( download)

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Book Synopsis A Realizable Reynolds Stress Algebraic Equation Model by : Tsan-Hsing Shih

Download or read book A Realizable Reynolds Stress Algebraic Equation Model written by Tsan-Hsing Shih and published by . This book was released on 1993 with total page 42 pages. Available in PDF, EPUB and Kindle. Book excerpt: The invariance theory in continuum mechanics is applied to analyze Reynolds stresses in high Reynolds number turbulent flows. The analysis leads to a turbulent constitutive relation that relates the Reynolds stresses to the mean velocity gradients in a more general form in which the classical isotropic eddy viscosity model is just the linear approximation of the general form. On the basis of realizability analysis, a set of model coefficients are obtained which are functions of the time scale ratios of the turbulence to the mean strain rate and the mean rotation rate. The coefficients will ensure the positivity of each component of the mean rotation rate. These coefficients will ensure the positivity of each component of the turbulent kinetic energy - realizability that most existing turbulence models fail to satisfy. Separated flows over backward-facing step configurations are taken as applications. The calculations are performed with a conservative finite-volume method. Grid-independent and numerical diffusion-free solutions are obtained by using differencing schemes of second-order accuracy on sufficiently fine grids. The calculated results are compared in detail with the experimental data for both mean and turbulent quantities. The comparison shows that the present proposal significantly improves the predictive capability of K-epsilon based two equation models. In addition, the proposed model is able to simulate rotational homogeneous shear flows with large rotation rates which all conventional eddy viscosity models fail to simulate.

Engineering Turbulence Modelling and Experiments - 4

Author : D. Laurence
Publisher : Elsevier
ISBN 13 : 0080530982
Total Pages : 975 pages
Book Rating : 4.0/5 (85 download)

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Book Synopsis Engineering Turbulence Modelling and Experiments - 4 by : D. Laurence

Download or read book Engineering Turbulence Modelling and Experiments - 4 written by D. Laurence and published by Elsevier. This book was released on 1999-04-14 with total page 975 pages. Available in PDF, EPUB and Kindle. Book excerpt: These proceedings contain the papers presented at the 4th International Symposium on Engineering Turbulence Modelling and Measurements held at Ajaccio, Corsica, France from 24-26 May 1999. It follows three previous conferences on the topic of engineering turbulence modelling and measurements. The purpose of this series of symposia is to provide a forum for presenting and discussing new developments in the area of turbulence modelling and measurements, with particular emphasis on engineering-related problems. Turbulence is still 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 more and more on the performance of the turbulence models. Successful simulation of turbulence requires the understanding of the complex physical phenomena involved and suitable models for describing the turbulent momentum, heat and mass transfer. For the understanding of turbulence phenomena, experiments are indispensable, but they are equally important for providing data for the development and testing of turbulence models and hence for CFD software validation.

Fully-explicit and Self-consistent Algebraic Reynolds Stress Model

Author : S. S. Girimaji
Publisher :
ISBN 13 :
Total Pages : 22 pages
Book Rating : 4.:/5 (897 download)

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Book Synopsis Fully-explicit and Self-consistent Algebraic Reynolds Stress Model by : S. S. Girimaji

Download or read book Fully-explicit and Self-consistent Algebraic Reynolds Stress Model written by S. S. Girimaji and published by . This book was released on 1995 with total page 22 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Critical Assessment of Reynolds Stress Turbulence Models Using Homogeneous Flows

Author : Aamir Shabbir
Publisher :
ISBN 13 :
Total Pages : 34 pages
Book Rating : 4.:/5 (31 download)

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Book Synopsis Critical Assessment of Reynolds Stress Turbulence Models Using Homogeneous Flows by : Aamir Shabbir

Download or read book Critical Assessment of Reynolds Stress Turbulence Models Using Homogeneous Flows written by Aamir Shabbir and published by . This book was released on 1992 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt:

On Explicit Algebraic Stress Models for Complex Turbulent Flows

Author : National Aeronautics and Space Administration (NASA)
Publisher : Createspace Independent Publishing Platform
ISBN 13 : 9781722451066
Total Pages : 38 pages
Book Rating : 4.4/5 (51 download)

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Book Synopsis On Explicit Algebraic Stress Models for Complex Turbulent Flows by : National Aeronautics and Space Administration (NASA)

Download or read book On Explicit Algebraic Stress Models for Complex Turbulent Flows written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-07-09 with total page 38 pages. Available in PDF, EPUB and Kindle. Book excerpt: Explicit algebraic stress models that are valid for three-dimensional turbulent flows in noninertial frames are systematically derived from a hierarchy of second-order closure models. This represents a generalization of the model derived by Pope who based his analysis on the Launder, Reece, and Rodi model restricted to two-dimensional turbulent flows in an inertial frame. The relationship between the new models and traditional algebraic stress models -- as well as anistropic eddy visosity models -- is theoretically established. The need for regularization is demonstrated in an effort to explain why traditional algebraic stress models have failed in complex flows. It is also shown that these explicit algebraic stress models can shed new light on what second-order closure models predict for the equilibrium states of homogeneous turbulent flows and can serve as a useful alternative in practical computations. Gatski, T. B. and Speziale, C. G. Langley Research Center NAS1-18605; NAS1-19480; RTOP 505-90-52-01...

Engineering Turbulence Modelling and Experiments 5

Author : W. Rodi
Publisher : Elsevier
ISBN 13 : 008053094X
Total Pages : 1029 pages
Book Rating : 4.0/5 (85 download)

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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.

Prediction of Transonic Vortex Flows Using Linear and Nonlinear Turbulent Eddy Viscosity Models

Author : Robert E. Bartels
Publisher :
ISBN 13 :
Total Pages : 38 pages
Book Rating : 4.:/5 (317 download)

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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.

Engineering Turbulence Modelling and Experiments 6

Author : Wolfgang Rodi
Publisher : Elsevier
ISBN 13 : 0080530958
Total Pages : 1011 pages
Book Rating : 4.0/5 (85 download)

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Book Synopsis Engineering Turbulence Modelling and Experiments 6 by : Wolfgang Rodi

Download or read book Engineering Turbulence Modelling and Experiments 6 written by Wolfgang Rodi and published by Elsevier. This book was released on 2005-05-05 with total page 1011 pages. Available in PDF, EPUB and Kindle. Book excerpt: Proceedings of the world renowned ERCOFTAC (International Symposium on Engineering Turbulence Modelling and Measurements). The proceedings include papers dealing with the following areas of turbulence: · Eddy-viscosity and second-order RANS models · Direct and large-eddy simulations and deductions for conventional modelling · Measurement and visualization techniques, experimental studies · Turbulence control · Transition and effects of curvature, rotation and buoyancy on turbulence · Aero-acoustics · Heat and mass transfer and chemically reacting flows · Compressible flows, shock phenomena · Two-phase flows · Applications in aerospace engineering, turbomachinery and reciprocating engines, industrial aerodynamics and wind engineering, and selected chemical engineering problems Turbulence remains one of the key issues in tackling engineering flow problems. These problems are solved more and more by CFD analysis, the reliability of which depends strongly on the performance of the turbulence models employed. Successful simulation of turbulence requires the understanding of the complex physical phenomena involved and suitable models for describing the turbulent momentum, heat and mass transfer. For the understanding of turbulence phenomena, experiments are indispensable, but they are equally important for providing data for the development and testing of turbulence models and hence for CFD software validation. As in other fields of Science, in the rapidly developing discipline of turbulence, swift progress can be achieved only by keeping up to date with recent advances all over the world and by exchanging ideas with colleagues active in related fields.

NASA Technical Paper

Author :
Publisher :
ISBN 13 :
Total Pages : 124 pages
Book Rating : 4.F/5 ( download)

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Book Synopsis NASA Technical Paper by :

Download or read book NASA Technical Paper written by and published by . This book was released on 1996 with total page 124 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Differential Reynolds Stress Modeling for Separating Flows in Industrial Aerodynamics

Author : Bernhard Eisfeld
Publisher : Springer
ISBN 13 : 331915639X
Total Pages : 106 pages
Book Rating : 4.3/5 (191 download)

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Book Synopsis Differential Reynolds Stress Modeling for Separating Flows in Industrial Aerodynamics by : Bernhard Eisfeld

Download or read book Differential Reynolds Stress Modeling for Separating Flows in Industrial Aerodynamics written by Bernhard Eisfeld and published by Springer. This book was released on 2015-03-24 with total page 106 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents recent progress in the application of RANS turbulence models based on the Reynolds stress transport equations. A variety of models has been implemented by different groups into different flow solvers and applied to external as well as to turbo machinery flows. Comparisons between the models allow an assessment of their performance in different flow conditions. The results demonstrate the general applicability of differential Reynolds stress models to separating flows in industrial aerodynamics.