Development Of Turbulence Models For Shear Flows By A Double Expansion Technique

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Development of Turbulence Models for Shear Flows by a Double Expansion Technique

Author : National Aeronautics and Space Administration (NASA)
Publisher : Createspace Independent Publishing Platform
ISBN 13 : 9781722168841
Total Pages : 30 pages
Book Rating : 4.1/5 (688 download)

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Book Synopsis Development of Turbulence Models for Shear Flows by a Double Expansion Technique by : National Aeronautics and Space Administration (NASA)

Download or read book Development of Turbulence Models for Shear Flows by a Double Expansion Technique written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-07-02 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt: Turbulence models are developed by supplementing the renormalization group (RNG) approach of Yakhot and Orszag with scale expansions for the Reynolds stress and production of dissipation terms. The additional expansion parameter (eta) is the ratio of the turbulent to mean strain time scale. While low-order expansions appear to provide an adequate description of the Reynolds stress, no finite truncation of the expansion for the production of dissipation term in powers of eta suffices - terms of all orders must be retained. Based on these ideas, a new two-equation model and Reynolds stress transport model are developed for turbulent shear flows. The models are tested for homogeneous shear flow and flow over a backward facing step. Comparisons between the model predictions and experimental data are excellent. Yakhot, V. and Thangam, S. and Gatski, T. B. and Orszag, S. A. and Speziale, C. G. Langley Research Center NAS1-18605; RTOP 505-90-52-01...

Development of Turbulence Models for Shear Flows by a Double Expansion Technique

Author : Institute for Computer Applications in Science and Engineering
Publisher :
ISBN 13 :
Total Pages : 32 pages
Book Rating : 4.:/5 (317 download)

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Book Synopsis Development of Turbulence Models for Shear Flows by a Double Expansion Technique by : Institute for Computer Applications in Science and Engineering

Download or read book Development of Turbulence Models for Shear Flows by a Double Expansion Technique written by Institute for Computer Applications in Science and Engineering and published by . This book was released on 1991 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Turbulent Flows

Author : Jean Piquet
Publisher : Springer Science & Business Media
ISBN 13 : 9783540654117
Total Pages : 778 pages
Book Rating : 4.6/5 (541 download)

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Book Synopsis Turbulent Flows by : Jean Piquet

Download or read book Turbulent Flows written by Jean Piquet and published by Springer Science & Business Media. This book was released on 2001-03-26 with total page 778 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.

Turbulence Modelling Approaches

Author : Konstantin Volkov
Publisher : BoD – Books on Demand
ISBN 13 : 9535133497
Total Pages : 252 pages
Book Rating : 4.5/5 (351 download)

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Book Synopsis Turbulence Modelling Approaches by : Konstantin Volkov

Download or read book Turbulence Modelling Approaches written by Konstantin Volkov and published by BoD – Books on Demand. This book was released on 2017-07-26 with total page 252 pages. Available in PDF, EPUB and Kindle. Book excerpt: Accurate prediction of turbulent flows remains a challenging task despite considerable work in this area and the acceptance of CFD as a design tool. The quality of the CFD calculations of the flows in engineering applications strongly depends on the proper prediction of turbulence phenomena. Investigations of flow instability, heat transfer, skin friction, secondary flows, flow separation, and reattachment effects demand a reliable modelling and simulation of the turbulence, reliable methods, accurate programming, and robust working practices. The current scientific status of simulation of turbulent flows as well as some advances in computational techniques and practical applications of turbulence research is reviewed and considered in the book.

Turbulence Models and Their Application

Author : Tuncer Cebeci
Publisher : Springer Science & Business Media
ISBN 13 : 9783540402886
Total Pages : 140 pages
Book Rating : 4.4/5 (28 download)

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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.

Development and Application of Advanced One-point Turbulence Models

Author :
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (684 download)

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Book Synopsis Development and Application of Advanced One-point Turbulence Models by :

Download or read book Development and Application of Advanced One-point Turbulence Models written by and published by . This book was released on 2006 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Full self-preserving solutions in isotropic decay and homogeneous shear flow turbulence have been examined from a basic theoretical standpoint. These constitute solutions for the two-point double and triple velocity correlations that are self-similar at all scales. Consistent with earlier studies, it was found that both isotropic decay and homogeneous shear flow turbulence have full self-preserving solutions. At high Reynolds numbers - with finite viscosity - the full self-preserving solution for isotropic decay corresponds to a t[sup -1] power-law decay whereas that for homogeneous shear flow corresponds to a production-equals-dissipation equilibrium. An alternative derivation of the isotropic results based on group theory considerations was recently achieved by T. Clark and C. Zemach of Los Alamos. These results suggest that such self-preserving solutions are associated with a singularity in the energy spectrum tensor (i.e., the Fourier transform of the two-point double velocity correlation tensor) at zero wave vector. This can have a profound effect on turbulence models. The ultimate goal is to use these two-point results for the development of improved one-point turbulence models for the solution of practical turbulent flows of scientific and engineering interest.

Modeling Complex Turbulent Flows

Author : Manuel D. Salas
Publisher : Springer Science & Business Media
ISBN 13 : 9780792355908
Total Pages : 402 pages
Book Rating : 4.3/5 (559 download)

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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 1999-04-30 with total page 402 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.

A Critical Evaluation of Various Turbulence Models as Applied to Internal Fluid Flows

Author : M. Nallasamy
Publisher :
ISBN 13 :
Total Pages : 80 pages
Book Rating : 4.:/5 (31 download)

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Book Synopsis A Critical Evaluation of Various Turbulence Models as Applied to Internal Fluid Flows by : M. Nallasamy

Download or read book A Critical Evaluation of Various Turbulence Models as Applied to Internal Fluid Flows written by M. Nallasamy and published by . This book was released on 1985 with total page 80 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Modeling of Turbulent Free Shear Flows

Author : National Aeronautics and Space Adm Nasa
Publisher : Independently Published
ISBN 13 : 9781793976789
Total Pages : 40 pages
Book Rating : 4.9/5 (767 download)

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Book Synopsis Modeling of Turbulent Free Shear Flows by : National Aeronautics and Space Adm Nasa

Download or read book Modeling of Turbulent Free Shear Flows written by National Aeronautics and Space Adm Nasa and published by Independently Published. This book was released on 2019-01-13 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt: The modeling of turbulent free shear flows is crucial to the simulation of many aerospace applications, yet often receives less attention than the modeling of wall boundary layers. Thus, while turbulence model development in general has proceeded very slowly in the past twenty years, progress for free shear flows has been even more so. This paper highlights some of the fundamental issues in modeling free shear flows for propulsion applications, presents a review of past modeling efforts, and identifies areas where further research is needed. Among the topics discussed are differences between planar and axisymmetric flows, development versus self-similar regions, the effect of compressibility and the evolution of compressibility corrections, the effect of temperature on jets, and the significance of turbulent Prandtl and Schmidt numbers for reacting shear flows. Large eddy simulation greatly reduces the amount of empiricism in the physical modeling, but is sensitive to a number of numerical issues. This paper includes an overview of the importance of numerical scheme, mesh resolution, boundary treatment, sub-grid modeling, and filtering in conducting a successful simulation. Yoder, Dennis A. and DeBonis, James R. and Georgiadis, Nicolas J. Glenn Research Center NASA/TM-2013-218072, AIAA Paper 2013-2721, E-18747

Calculation of Reattaching Shear Layers in Divergent Channel with a Multiple-time-scale Turbulence Model

Author : S.-W. Kim
Publisher :
ISBN 13 :
Total Pages : 30 pages
Book Rating : 4.:/5 (31 download)

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Book Synopsis Calculation of Reattaching Shear Layers in Divergent Channel with a Multiple-time-scale Turbulence Model by : S.-W. Kim

Download or read book Calculation of Reattaching Shear Layers in Divergent Channel with a Multiple-time-scale Turbulence Model written by S.-W. Kim and published by . This book was released on 1989 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt:

A Rapid-distortion-theory Turbulence Model for Developed Unsteady Wall-bounded Flow

Author :
Publisher :
ISBN 13 :
Total Pages : 22 pages
Book Rating : 4.:/5 (317 download)

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Book Synopsis A Rapid-distortion-theory Turbulence Model for Developed Unsteady Wall-bounded Flow by :

Download or read book A Rapid-distortion-theory Turbulence Model for Developed Unsteady Wall-bounded Flow written by and published by . This book was released on 1993 with total page 22 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Turbulent Shear Flows 3

Author : Leslie John Stanley Bradbury
Publisher : Springer
ISBN 13 :
Total Pages : 344 pages
Book Rating : 4.:/5 (318 download)

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Book Synopsis Turbulent Shear Flows 3 by : Leslie John Stanley Bradbury

Download or read book Turbulent Shear Flows 3 written by Leslie John Stanley Bradbury and published by Springer. This book was released on 1982 with total page 344 pages. Available in PDF, EPUB and Kindle. Book excerpt: In spite of intensive efforts over many decades, the problem of turbulence remains as challenging as ever and the number of papers, books and conferences on this topic con- tinues to grow. As experimental techniques and computing power have developed, the breadth of investigations into the structure and development of turbulent flows has in- creased to encompass many diverse fields of application in engineering, physics, biolo- gy and so on. As a consequence, it is now very difficult for a single research worker to keep in touch with the many developments that are taking place in turbulence. One of the few opportunities for obtaining some overall view of the subject arises from large international symposia on turbulence and, although they have some drawbacks, it is this opportunity that is one of their main merits. The International Symposium on Turbulent Shear Flows has now been held on three occasions and they seem to be established as a major opportunity for papers on a very diverse range of topics to be presented at a single meeting. This volume is a collec- tion of papers from the third symposium that was held at the University of California, Davis from 9-11 September 1981. The papers are divided into four sections entitled Wall Flows, Scalar Transport, Recirculating Flows and Fundamentals. This collection represents about a third of the total number of papers presented.

Workshop on Engineering Turbulence Modeling

Author :
Publisher :
ISBN 13 :
Total Pages : 536 pages
Book Rating : 4.:/5 (317 download)

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Book Synopsis Workshop on Engineering Turbulence Modeling by :

Download or read book Workshop on Engineering Turbulence Modeling written by and published by . This book was released on 1992 with total page 536 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Turbulent Shear Flows 8

Author : F. Durst
Publisher : Springer
ISBN 13 :
Total Pages : 448 pages
Book Rating : 4.3/5 (91 download)

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Book Synopsis Turbulent Shear Flows 8 by : F. Durst

Download or read book Turbulent Shear Flows 8 written by F. Durst and published by Springer. This book was released on 1993 with total page 448 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume contains a selection of the papers presented at the Eighth Symposium on Turbulent Shear Flows held at the Technical University of Munich, 9-11 September 1991. The first of these biennial international symposia was held at the Pennsylvania State Uni versity, USA, in 1977; subsequent symposia have been held at Imperial College, London, England; the University of California, Davis, USA; the University of Karlsruhe, Ger many; Cornell University, Ithaca, USA; the Paul Sabatier University, Toulouse, France; and Stanford University, California, USA. The purpose of this series of symposia is to provide a forum for the presentation and discussion of new developments in the field of turbulence, especially as related to shear flows of importance in engineering and geo physics. From the 330 extended abstracts submitted for this symposium, 145 papers were presented orally and 60 as posters. Out of these, we have selected twenty-four papers for inclusion in this volume, each of which has been revised and extended in accordance with the editors' recommendations. The following four theme areas were selected after consideration of the quality of the contributions, the importance of the area, and the selection made in earlier volumes: - wall flows, - separated flows, - compressibility effects, - buoyancy, rotation, and curvature effects. As in the past, each section corresponding to the above areas begins with an introduction by an authority in the field that places the individual contributions in context with one another and with related research.

Multiscale and Multiresolution Approaches in Turbulence

Author : Pierre Sagaut
Publisher : World Scientific
ISBN 13 : 1848169876
Total Pages : 446 pages
Book Rating : 4.8/5 (481 download)

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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 2013 with total page 446 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book aims to provide the reader with an updated general presentation of multiscale/multiresolution approaches in turbulent flow simulations. All modern approaches (LES, hybrid RANS/LES, DES, SAS) are discussed and recast in a global comprehensive framework. Both theoretical features and practical implementation details are addressed. Some full scale applications are described, to provide the reader with relevant guidelines to facilitate a future use of these methods.

Developments in Computational Modeling of Turbulent Flows

Author : Tsan-Hsing Shih
Publisher :
ISBN 13 :
Total Pages : 34 pages
Book Rating : 4.:/5 (317 download)

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Book Synopsis Developments in Computational Modeling of Turbulent Flows by : Tsan-Hsing Shih

Download or read book Developments in Computational Modeling of Turbulent Flows written by Tsan-Hsing Shih and published by . This book was released on 1996 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt:

The Slipcover for The John Zink Hamworthy Combustion Handbook

Author : Charles E. Baukal Jr.
Publisher : CRC Press
ISBN 13 : 1439863105
Total Pages : 1184 pages
Book Rating : 4.4/5 (398 download)

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Book Synopsis The Slipcover for The John Zink Hamworthy Combustion Handbook by : Charles E. Baukal Jr.

Download or read book The Slipcover for The John Zink Hamworthy Combustion Handbook written by Charles E. Baukal Jr. and published by CRC Press. This book was released on 2018-10-03 with total page 1184 pages. Available in PDF, EPUB and Kindle. Book excerpt: Despite the length of time it has been around, its importance, and vast amounts of research, combustion is still far from being completely understood. Issues regarding the environment, cost, and fuel consumption add further complexity, particularly in the process and power generation industries. Dedicated to advancing the art and science of industr