New Aspects of Vortex Dynamics Relevant to Coherent Structures in Turbulent Flows
Vortex dynamics offers a tractable avenue for explaining the dynamics of coherent structures, which appear to be the dominant features of turbulent shear flows and are the key to predicting and controlling turbulence phenomena such as mixing, entrainment,
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Series Editors: The Rectors oi CISM Sandor Kaliszky - Budapest Mahir Sayir - Zurich Wilhelm Schneider - Wien The Secretary General oi CISM Giovanni Bianchi - Milan Executive Editor Carlo Tasso - Udine
The series presents lecture notes, monographs, edited works and proceedings in the field of Mechanics, Engineering, Computer Science and Applied Mathematics. Purpose of the series is to make known in the international scientific and technical community results obtained in some of the activities organized by CISM, the International Centre for Mechanical Sciences.
INTERNATIONAL CENTRE FOR MECHANICAL SCIENCES COURSES AND LECTURES - No. 353
EDDY STRUCTURE IDENTIFICATION
EDITEDBY
J.P. BaNNET UNIVERSITY OF POITIERS
SPRINGER-VERLAG WIEN GMBH
Lc spese di stampa di questo volume sono in parte copcrtc da
contributi deI Consiglio Nazionale delle Ricerche.
This volume contains 139 illustrations
This work is subject to copyright. All rights are reserved, whether the whole or part of the material is concemed specifically those of translation, reprinting, re-use of illustrations, broadcasting, reproduction by photocopying machine or similar means, and storage in data banks. © 1996 by Springer-Verlag Wien Originally published by Springer-Verlag Wien New York in 1996
In order to make this volume available as economically and as rapidly as possible the authors' typeseripts have been reproduced in their original forms. This method unfortunately has its typographical limitations but it is hoped that they in no way distract the reader.
ISBN 978-3-211-82802-1 DOI 10.1007/978-3-7091-2676-9
ISBN 978-3-7091-2676-9 (eBook)
PREFACE
This book presents the talks given du ring the joint CISMIERCOFTAC advanced course on "Eddy Structure Identification Techniques in Free Turbulent Shear Flows" held in Udine (Italy), May 23-26, 1994. This course was a unique opportunity to bring together information that is needed for both experimentalists, theoreticians and computationalists for the analysis of eddy structures in turbulent shear flows. It is now widely recognized that Large Scale Structures or Eddies in turbulent flows are essential for a physical understanding of these flows, for developing new prediction codes, for analyzing experimental and computational data and for developing new research areas such as flow control. With the exception of some particular situations, like transitional or artificially excited flows, these structures are embedded inside the overall chaotic behavior of the turbulent field. The researcher or the engineer is often faced with the problem of capturing, defining and analyzing the statistics and dynamics of these structures. Several approaches are now available for such identification, due to improvement of theoretical approaches as weil as of experimental and numerical techniques. Identification techniques should be chosen after analysis of the geometrical flow properties, and closely depend upon the nature of the available information from experiments or calculations. The present course mainly focused o
