Time Dependent Turbulence Modeling and Analytical Theories of Turbulence
Author : R. Rubinstein
Publisher :
Page : 32 pages
File Size : 31,80 MB
Release : 1993
Category : Turbulence
ISBN :
Author : R. Rubinstein
Publisher :
Page : 32 pages
File Size : 31,80 MB
Release : 1993
Category : Turbulence
ISBN :
Author : National Aeronautics and Space Adm Nasa
Publisher : Independently Published
Page : 32 pages
File Size : 16,49 MB
Release : 2018-10-18
Category : Science
ISBN : 9781728901312
By simplifying the direct interaction approximation (DIA) for turbulent shear flow, time dependent formulas are derived for the Reynolds stresses which can be included in two equation models. The Green's function is treated phenomenologically, however, following Smith and Yakhot, we insist on the short and long time limits required by DIA. For small strain rates, perturbative evaluation of the correlation function yields a time dependent theory which includes normal stress effects in simple shear flows. From this standpoint, the phenomenological Launder-Reece-Rodi model is obtained by replacing the Green's function by its long time limit. Eddy damping corrections to short time behavior initiate too quickly in this model; in contrast, the present theory exhibits strong suppression of eddy damping at short times. A time dependent theory for large strain rates is proposed in which large scales are governed by rapid distortion theory while small scales are governed by Kolmogorov inertial range dynamics. At short times and large strain rates, the theory closely matches rapid distortion theory, but at long times it relaxes to an eddy damping model. Rubinstein, R. Glenn Research Center NCC3-233; RTOP 505-90-5K
Author :
Publisher :
Page : 28 pages
File Size : 41,73 MB
Release : 1993
Category :
ISBN :
Author : Martin Oberlack
Publisher : Springer
Page : 377 pages
File Size : 35,83 MB
Release : 2014-05-04
Category : Science
ISBN : 3709125642
The term "turbulence” is used for a large variety of dynamical phenomena of fluids in motion whenever the details of the flow appear to be random and average properties are of primary interest. Just as wide ranging are the theoretical methods that have been applied towards a better understanding of fluid turbulence. In this book a number of these methods are described and applied to a broad range of problems from the transition to turbulence to asymptotic turbulence when the inertial part of the spectrum is fully developed. Statistical as well as nonstatistical treatments are presented, but a complete coverage of the subject is not attempted. The book will be of interest to scientists and engineers who wish to familiarize themselves with modern developments in theories of turbulence. The fact that the properties of turbulent fluid flow are addressed from very different points of view makes this volume rather unique among presently available books on turbulence.
Author : C. Foias
Publisher : Cambridge University Press
Page : 363 pages
File Size : 11,42 MB
Release : 2001-08-27
Category : Science
ISBN : 1139428993
This book presents the mathematical theory of turbulence to engineers and physicists, and the physical theory of turbulence to mathematicians. The mathematical technicalities are kept to a minimum within the book, enabling the language to be at a level understood by a broad audience.
Author :
Publisher :
Page : 488 pages
File Size : 29,87 MB
Release : 1995
Category : Aeronautics
ISBN :
Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
Author : Sal Rodriguez
Publisher : Springer Nature
Page : 316 pages
File Size : 46,16 MB
Release : 2019-12-06
Category : Computers
ISBN : 3030286916
This unique text provides engineering students and practicing professionals with a comprehensive set of practical, hands-on guidelines and dozens of step-by-step examples for performing state-of-the-art, reliable computational fluid dynamics (CFD) and turbulence modeling. Key CFD and turbulence programs are included as well. The text first reviews basic CFD theory, and then details advanced applied theories for estimating turbulence, including new algorithms created by the author. The book gives practical advice on selecting appropriate turbulence models and presents best CFD practices for modeling and generating reliable simulations. The author gathered and developed the book’s hundreds of tips, tricks, and examples over three decades of research and development at three national laboratories and at the University of New Mexico—many in print for the first time in this book. The book also places a strong emphasis on recent CFD and turbulence advancements found in the literature over the past five to 10 years. Readers can apply the author’s advice and insights whether using commercial or national laboratory software such as ANSYS Fluent, STAR-CCM, COMSOL, Flownex, SimScale, OpenFOAM, Fuego, KIVA, BIGHORN, or their own computational tools. Applied Computational Fluid Dynamics and Turbulence Modeling is a practical, complementary companion for academic CFD textbooks and senior project courses in mechanical, civil, chemical, and nuclear engineering; senior undergraduate and graduate CFD and turbulence modeling courses; and for professionals developing commercial and research applications.
Author : Tuncer Cebeci
Publisher : Springer Science & Business Media
Page : 140 pages
File Size : 46,35 MB
Release : 2003-12-04
Category : Science
ISBN : 9783540402886
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.
Author : Pierre Sagaut
Publisher : World Scientific
Page : 446 pages
File Size : 19,75 MB
Release : 2013
Category : Science
ISBN : 1848169876
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.
Author :
Publisher :
Page : pages
File Size : 22,36 MB
Release : 1994
Category : Government publications
ISBN :