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SPATIO-TEMPORAL 3D CORRELATIONS OF FLUCTUATING PRESSURE AND VELOCITY IN A HIGH REYNOLDS NUMBER TURBULENT BOUNDARY LAYER

Yoshitsugu Naka
Department of Mechanical and Aerospace Engineering Tokyo Institute of Technology 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8550, Japan

Sebastien Coudert
Laboratoire de Mécanique de Lille, UMR CNRS 8107 Bv Paul Langevin, Cité Scientifique F-59655 Villeneuve d'Ascq, France

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

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

Abstrakt

In the present study, we developed a new experimental setup for the simultaneous measurements of the fluctuating pressure and the three velocity components in a turbulent boundary layer. A quantitative measure of the extension of the space-time pressure-velocity correlations is given based on their reconstructed 3D distributions. The correlations of the fluctuating pressure and each three velocity components exhibit characteristic behavior: the pressure-streamwise velocity correlations show the inclined elongated shape and have extensions approximately 5-6δ, while the pressure-wall normal velocity correlations are more localized with an extension of 0.3δ and with an inclination of roughly 45° at the pressure reference points close to the wall. The pressure-spanwise velocity correlations show the distribution evoking a representation of the streamwise vortical structures with the size of the order of the boundary layer thickness and the meandering of them.