The Origin Of Turbulence In Near Wall Flows

Author : A.V. Boiko,Genrih R. Grek,A.V. Dovgal,Victor V. Kozlov
Publisher : Springer Science & Business Media
Page : 273 pages
File Size : 52,9 Mb
Release : 2013-03-09
Category : Technology & Engineering
ISBN : 9783662047651

Get Book

The Origin of Turbulence in Near-Wall Flows by A.V. Boiko,Genrih R. Grek,A.V. Dovgal,Victor V. Kozlov Pdf

The Origin of Species Charles Darwin The origin of turbulence in fluids is a long-standing problem and has been the focus of research for decades due to its great importance in a variety of engineering applications. Furthermore, the study of the origin of turbulence is part of the fundamental physical problem of turbulence description and the philosophical problem of determinism and chaos. At the end of the nineteenth century, Reynolds and Rayleigh conjectured that the reason of the transition of laminar flow to the 'sinuous' state is in stability which results in amplification of wavy disturbances and breakdown of the laminar regime. Heisenberg (1924) was the founder of linear hydrody namic stability theory. The first calculations of boundary layer stability were fulfilled in pioneer works of Tollmien (1929) and Schlichting (1932, 1933). Later Taylor (1936) hypothesized that the transition to turbulence is initi ated by free-stream oscillations inducing local separations near wall. Up to the 1940s, skepticism of the stability theory predominated, in particular due to the experimental results of Dryden (1934, 1936). Only the experiments of Schubauer and Skramstad (1948) revealed the determining role of insta bility waves in the transition. Now it is well established that the transition to turbulence in shear flows at small and moderate levels of environmental disturbances occurs through development of instability waves in the initial laminar flow. In Chapter 1 we start with the fundamentals of stability theory, employing results of the early studies and recent advances.

Author : G. Biswas,V. Eswaran
Publisher : CRC Press
Page : 478 pages
File Size : 55,7 Mb
Release : 2002
Category : Technology & Engineering
ISBN : 0849310148

Get Book

Turbulent Flows by G. Biswas,V. Eswaran Pdf

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.

Author : M. T. Landahl,E. Mollo-Christensen
Publisher : Cambridge University Press
Page : 184 pages
File Size : 47,7 Mb
Release : 1992-09-25
Category : Mathematics
ISBN : 0521422132

Get Book

Turbulence and Random Processes in Fluid Mechanics by M. T. Landahl,E. Mollo-Christensen Pdf

Fluid flow turbulence is a phenomenon of great importance in many fields of engineering and science.

Author : Ronald M. C. So,Charles G. Speziale,Brian Edward Launder
Publisher : Elsevier Publishing Company
Page : 1072 pages
File Size : 50,8 Mb
Release : 1993
Category : Mathematics
ISBN : STANFORD:36105004093758

Get Book

Near-wall Turbulent Flows by Ronald M. C. So,Charles G. Speziale,Brian Edward Launder Pdf

Knowledge of near-wall turbulence from experimental, theoretical and numerical sources is accumulating at an ever increasing rate. An overview of the latest important developments is reported and discussed in depth in this volume with the goal of stimulating closer dialogue between researchers in all areas of near-wall turbulence. The full text of 95 contributed papers cover a broad range of topics in near-wall turbulent flows that includes boundary layers, coherent structures, drag reduction, experimental methods, high speed flows, numerical simulations, transition and turbulent modeling. The innovativeness of the contributions demonstrates that near-wall turbulence remains a vital and dynamically evolving field with important technological consequences for the future.

Author : Hua-Shu Dou
Publisher : Springer Nature
Page : 503 pages
File Size : 51,8 Mb
Release : 2022-03-25
Category : Technology & Engineering
ISBN : 9789811900877

Get Book

Origin of Turbulence by Hua-Shu Dou Pdf

This book presents the new discovery of the origin of turbulence from Navier–Stokes equations. The fully developed turbulence is found to be composed of singularities of flow field. The mechanisms of flow stability and turbulent transition are described using the energy gradient theory, which states all the flow instability and breakdown resulted from the gradient of the total mechanical energy normal to the flow direction. This approach is universal for flow instability in Newtonian flow and non-Newtonian flow. The theory has been used to solve several problems, such as plane and pipe Poiseuille flows, plane Couette flow, Taylor–Couette flow, flows in straight coaxial annulus, flows in curved pipes and ducts, thermal convection flow, viscoelastic flow, and magnet fluid flow, etc. The theory is in agreement with results from numerical simulations and experiments. The analytical method used in this book is novel and is different from the traditional approaches. This book includes the fundamental basics of flow stability and turbulent transition, the essentials of the energy gradient theory, and the applications of the theory to several practical problems. This book is suitable for researchers and graduate students.

Author : S. W. Kim
Publisher : Unknown
Page : 34 pages
File Size : 50,5 Mb
Release : 1988
Category : Fluid mechanics
ISBN : NASA:31769000584295

Get Book

A Near-wall Turbulence Model and Its Application to Fully Developed Turbulent Channel and Pipe Flows by S. W. Kim Pdf

Author : Paul A. Libby
Publisher : CRC Press
Page : 370 pages
File Size : 41,8 Mb
Release : 1996-10-01
Category : Technology & Engineering
ISBN : 1560321008

Get Book

An Introduction To Turbulence by Paul A. Libby Pdf

Beginning with a description of turbulence, its various manifestations, and a brief history of study, this text also incorporates modern perspectives on turbulence. The text also covers such topics as intermittency and the resultant conditional sampling and averaging of turbulent flows, the role of large scale computation of the fundamental equations of fluid mechanics in providing information on variables, and asymptotic methods which are used to expose important features of turbulent flows. Meaningful exercises are included in every section.

Author : Ronald Lee Panton
Publisher : Computational Mechanics
Page : 448 pages
File Size : 47,8 Mb
Release : 1997
Category : Science
ISBN : UOM:39015040075601

Get Book

Self-sustaining Mechanisms of Wall Turbulence by Ronald Lee Panton Pdf

Why is wall turbulence self-sustaining? In this book well-regarded researchers not only discuss what they know and believe, but also speculate on ideas that still require numerical or experimental testing and verification. An initial brief history of boundary layer structure research is followed by chapters on experimental information and specific topics within the subject. There are then sections on computational aspects.

Author : A. Tsinober
Publisher : Springer Science & Business Media
Page : 328 pages
File Size : 54,7 Mb
Release : 2006-04-11
Category : Science
ISBN : 9780306483844

Get Book

An Informal Introduction to Turbulence by A. Tsinober Pdf

To Turbulence by ARKADY TSINOBER Department of Fluid Mechanics, Faculty of Engineering, Tel Aviv University, Tel Aviv, Israel KLUWER ACADEMIC PUBLISHERS NEW YORK, BOSTON, DORDRECHT, LONDON, MOSCOW eBookISBN: 0-306-48384-X Print ISBN: 1-4020-0110-X ©2004 Kluwer Academic Publishers NewYork, Boston, Dordrecht, London, Moscow Print ©2001 Kluwer Academic Publishers Dordrecht All rights reserved No part of this eBook maybe reproducedor transmitted inanyform or byanymeans, electronic, mechanical, recording, or otherwise, without written consent from the Publisher Created in the United States of America Visit Kluwer Online at: http://kluweronline. com and Kluwer's eBookstoreat: http://ebooks. kluweronline. com TO My WITS TABLE OF CONTENTS 1 INTRODUCTION 1 Brief history 1 1. 1 1. 2 Nature and major qualitative universal features of turbulent flows 2 1. 2. 1 Representative examples of turbulent flows 2 1. 2. 2 In lieu of definition: major qualitative universal f- tures of turbulent flows 15 1. 3 Why turbulence is so impossibly difficult? The three N's 19 On the Navier-Stokes equations 19 1. 3. 1 1. 3. 2 On the nature of the problem 21 1. 3. 3 Nonlinearity 22 1. 3. 4 Noninegrability 22 Nonlocality 1. 3. 5 23 1. 3. 6 On physics of turbulence 24 1. 3. 7 On statistical theories 24 1. 4 Outline of the following material 25 1. 5 In lieu of summary 26 2 ORIGINS OF TURBULENCE 27 2. 1 Instability 27 2. 2 Transition to turbulence versus routes to chaos 29 2.

Author : P. A. Durbin,B. A. Pettersson Reif
Publisher : Wiley-Blackwell
Page : 312 pages
File Size : 41,8 Mb
Release : 2001-03-12
Category : Mathematics
ISBN : UOM:39015049982898

Get Book

Statistical Theory and Modeling for Turbulent Flows by P. A. Durbin,B. A. Pettersson Reif Pdf

Most natural and industrial flows are turbulent. The atmosphere and oceans, automobile and aircraft engines, all provide examples of this ubiquitous phenomenon. In recent years, turbulence has become a very lively area of scientific research and application, and this work offers a grounding in the subject of turbulence, developing both the physical insight and the mathematical framework needed to express the theory. Providing a solid foundation in the key topics in turbulence, this valuable reference resource enables the reader to become a knowledgeable developer of predictive tools. This central and broad ranging topic would be of interest to graduate students in a broad range of subjects, including aeronautical and mechanical engineering, applied mathematics and the physical sciences. The accompanying solutions manual to the text also makes this a valuable teaching tool for lecturers and for practising engineers and scientists in computational and experimental and experimental fluid dynamics.

Author : A. A. R. Townsend
Publisher : Cambridge University Press
Page : 450 pages
File Size : 51,6 Mb
Release : 1976
Category : Mathematics
ISBN : 0521298199

Get Book

The Structure of Turbulent Shear Flow by A. A. R. Townsend Pdf

Develops a physical theory from the mass of experimental results, with revisions to reflect advances of recent years.

Author : Yurii N. Grigoryev,Igor V. Ershov
Publisher : Springer
Page : 201 pages
File Size : 51,8 Mb
Release : 2017-04-08
Category : Science
ISBN : 9783319553603

Get Book

Stability and Suppression of Turbulence in Relaxing Molecular Gas Flows by Yurii N. Grigoryev,Igor V. Ershov Pdf

This book presents an in-depth systematic investigation of a dissipative effect which manifests itself as the growth of hydrodynamic stability and suppression of turbulence in relaxing molecular gas flows. The work describes the theoretical foundations of a new way to control stability and laminar turbulent transitions in aerodynamic flows. It develops hydrodynamic models for describing thermal nonequilibrium gas flows which allow the consideration of suppression of inviscid acoustic waves in 2D shear flows. Then, nonlinear evolution of large-scale vortices and Kelvin-Helmholtz waves in relaxing shear flows are studied. Critical Reynolds numbers in supersonic Couette flows are calculated analytically and numerically within the framework of both linear and nonlinear classical energy hydrodynamic stability theories. The calculations clearly show that the relaxation process can appreciably delay the laminar-turbulent transition. The aim of the book is to show the new dissipative effect, which can be used for flow control and laminarization. This volume will be of interest and useful to mechanical engineers, physicists, and mathematicians who specialize in hydrodynamic stability theory, turbulence, and laminarization of flows.

Author : B Mutlu Sumer,David R Fuhrman
Publisher : World Scientific
Page : 758 pages
File Size : 54,5 Mb
Release : 2020-03-23
Category : Technology & Engineering
ISBN : 9789813234321

Get Book

Turbulence In Coastal And Civil Engineering by B Mutlu Sumer,David R Fuhrman Pdf

This book discusses the subject of turbulence encountered in coastal and civil engineering.The primary aim of the book is to describe turbulence processes including transition to turbulence; mean and fluctuating flows in channels/pipes, and in currents; wave boundary layers (including boundary layers under solitary waves); streaming processes in wave boundary layers; turbulence processes in breaking waves including breaking solitary waves; turbulence processes such as bursting process and their implications for sediment transport; flow resistance in steady and wave boundary layers; and turbulent diffusion and dispersion processes in the coastal and river environment, including sediment transport due to diffusion/dispersion.Both phenomenological and statistical theories are described in great detail. Turbulence modelling is also described, and several examples for modelling of turbulence in steady flow and wave boundary layers are presented.The book ends with a chapter containing hands-on exercises on a wide variety of turbulent flows including experimental study of turbulence in an open-channel flow, using Laser Doppler Anemometry; Statistical, correlation and spectral analysis of turbulent air jet flow; Turbulence modelling of wave boundary layer flows; and numerical modelling of dispersion in a turbulent boundary layer, a set of exercises used by the authors in their Masters classes over many years.Although the book is essentially intended for professionals and researchers in the area of Coastal and Civil Engineering, and as a text book for graduate/post graduate students, the contents of the book will, however, additionally provide sufficient background in the study of turbulent flows relevant to many other disciplines, such as Wind Engineering, Mechanical Engineering, and Environmental Engineering.

Author : P. Bradshaw
Publisher : Springer Science & Business Media
Page : 345 pages
File Size : 42,7 Mb
Release : 2013-06-29
Category : Science
ISBN : 9783662225684

Get Book

Turbulence by P. Bradshaw Pdf

Turbulent transport of momentum, heat and matter dominates many of the fluid flows found in physics, engineering and the environmental sciences. Complicated unsteady motions which mayor may not count as turbulence are found in interstellar dust clouds and in the larger blood vessels. The fascination of this nonlinear, irreversible stochastic process for pure scientists is demonstrated by the contributions made to its understanding by several of the most distinguished mathematical physicists of this century, and its importance to engineers is evident from the wide variety of industries which have contributed to, or benefit from, our current knowledge. Several books on turbulence have appeared in recent years. Taken collectively, they illustrate the depth of the subject, from basic principles accessible to undergraduates to elaborate mathematical solutions representing many years of work, but there is no one account which emphasizes its breadth. For this, a multi-author work is necessary. This book is an introduction to our state of knowledge of turbulence in most of the branches of science which have contributed to that knowledge. It is not a Markovian sequence of unrelated essays, and we have not simply assembled specialized accounts of turbulence problems in each branch; this book is a unified treatment, with the material classified according to phenomena rather than application, and freed as far as possible from discipline-oriented detail. The approach is "applied" rather than "pure" with the aim of helping people who need to under stand or predict turbulence in real life.

Author : Sedat Tardu
Publisher : John Wiley & Sons
Page : 500 pages
File Size : 41,5 Mb
Release : 2014-10-06
Category : Technology & Engineering
ISBN : 9781848213951

Get Book

Transport and Coherent Structures in Wall Turbulence by Sedat Tardu Pdf

Wall bounded turbulent flows are of major importance in industrial and environmental fluid mechanics. The structure of the wall turbulence is intrinsically related to the coherent structures that play a fundamental role in the transport process. The comprehension of their regeneration mechanism is indispensable for the development of efficient strategies in terms of drag control and near wall turbulence management. This book provides an up-to-date overview on the progress made in this specific area in recent years.