Comptes Rendus
Control of three-dimensional wakes using evolution strategies
Comptes Rendus. Mécanique, Volume 333 (2005) no. 1, pp. 65-77.

We investigate three-dimensional cylinder wakes of incompressible fully developed flows at Re=300, resulting from control induced by tangential motions of the cylinder surface. The motion of the cylinder surface, in two dimensions, is optimized using evolution strategies, resulting in significant drag reduction and drastic modification of the wake as compared to the uncontrolled flow. The quasi-optimal velocity profile obtained in 2D is modified by spanwise harmonics and applied to 3D flows. The results indicate important differences in the flow physics induced by two and three dimensional control strategies.

On s'intéresse aux sillages de cylindres incompressibles dont la tridimensionnalité est totalement développée à Re=300, obtenus suite à un contrôle exercé par des mouvements tangentiels à la surface du corps. Les mouvements de surface sont optimisées par des stratégies évolutionnaires, et ont pour conséquence une réduction subtantielle du coefficient de traînée et une modification importante du sillage par rapport à l'écoulement non contrôlé. Le profil de vitesse quasi-optimal obtenu en 2D est modifié par des harmoniques dans la direction axiale, et appliqué à un écoulement 3D. Les résultats indiquent d'importantes différences dans la physique de l'écoulement selon la nature 2D ou 3D du contrôle.

Published online:
DOI: 10.1016/j.crme.2004.10.007
Keywords: Computational fluid mechanics, Evolution strategy, Three-dimensional wake
Mot clés : Mécanique des fluides numérique, Stratégie évolutionnaire, Sillage tridimensionnel

Philippe Poncet 1; Georges-Henri Cottet 2; Petros Koumoutsakos 3

1 Laboratoire MIP, département GMM, INSA, complexe scientifique de Rangueil, 31077 Toulouse cedex 4, France
2 Laboratoire LMC-IMAG, BP 53, 38041 Grenoble cedex 9, France
3 Institute of Computational Science, Swiss Federal Institute of Technology, 8092 Zürich, Switzerland
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Philippe Poncet; Georges-Henri Cottet; Petros Koumoutsakos. Control of three-dimensional wakes using evolution strategies. Comptes Rendus. Mécanique, Volume 333 (2005) no. 1, pp. 65-77. doi : 10.1016/j.crme.2004.10.007. https://comptes-rendus.academie-sciences.fr/mecanique/articles/10.1016/j.crme.2004.10.007/

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