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EXPERIMENTAL STUDY OF COHERENT STRUCTURES IN A TURBULENT BOUNDARY LAYER USING PIV

Michel Stanislas
Laboratoire de Mécanique de Lille, UMR CNRS 8107 Bv Paul Langevin, Cité Scientifique F-59655 Villeneuve d'Ascq, France; Laboratory for Turbulence Research in Aerospace and Combustion (LTRAC) Monash University, VIC 3800 Australia

Jean-Marc Foucaut
Laboratoire de Mécanique de Lille, UMR CNRS 8107 Bv Paul Langevin, Cité Scientifique F-59655 Villeneuve d'Ascq, France; Laboratory for Turbulence Research in Aerospace and Combustion (LTRAC) Monash University, VIC 3800 Australia

Jean-Philippe Laval
CNRS, UMR8107, F-59650 Villeneuve d'Ascq, France, Univ Lille Nord de France, F-59000 Lille, France

Lin Jie
LML UMR CNRS 8107 Bvd. Paul Langevin, Cité Scientifique 59655 Villeneuve d'Ascq

Johan Carlier
Irstea, University Europeenne de Bretagne, F-35044 Rennes, France

Abstract

Particle Image Velocimetry experiments have been performed in a turbulent boundary layer wind tunnel in order to study the coherent structures taking part in the generation and preservation of wall turbulence. The particular wind tunnel used is well suited for high resolution experiments (δ > 0.3 m) at high Reynolds numbers (up to Rϑ = 19 000 in the present results). The Particle Image Velocimetry experiments were carried out with different light sheet configurations including those similar to the visualization study by Head & Bandyopadhyay (1981). Eddy structures and near wall streaks were identified in instantaneous velocity maps in order to determine their mean characteristics.