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Response of a spatially developing turbulent boundary layer to active control strategies in the framework of opposition control

type de publication      article dans une revue internationale avec comité de lecture
date de publication 2007
auteur(s) Pamies Mathieu; Garnier Eric; Merlen Alain; Sagaut Pierre
journal (abréviation) Physics of Fluids (Phys Fluid)
volume (numéro) 19
numéro de papier 108102
résumé Opposition control is a simple feedback control method which can be used to attenuate near-wall turbulence and reduce drag in wall-bounded turbulent flows [H. Choi, P. Moin, and J. Kim, J. Fluid Mech. 262, 75 (1994)]. The idea is to impose blowing and suction at the wall to counteract near-wall quasistreamwise vortical structures. Unfortunately, the effectiveness of this method decreases as the Reynolds number increases [Y. Chang, S. Scott Collis, and S. Ramakrishnan, Phys. Fluids 14, 4069 (2002)]. The present study proposes using a simple modification of opposition control (OC) to increase its performance at high Reynolds numbers. We demonstrate a significant improvement on drag reduction when performing a blowing-only opposition control, where the suction part of OC has been removed, on a spatially developing turbulent boundary layer at Retau,delta=960, based on the boundary layer thickness and the friction velocity.
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