Comptes Rendus
no. 6
Optimal streaks in the wake of a blunt-based axisymmetric bluff body and their influence on vortex shedding
Mathieu Marant1  ; Carlo Cossu1  ; Grégory Pujals2
1 Institut de mécanique des fluides de Toulouse, CNRS–INP–UPS, 2, allée du Professeur-Camille-Soula, 31400 Toulouse, France
2 PSA Peugeot Citroën, Centre technique de Vélizy, 2, route de Gisy, 78943 Vélizy-Villacoublay cedex, France
Comptes Rendus. Mécanique, Volume 345 (2017) no. 6, pp. 378-385.

We compute the optimal perturbations of azimuthal wavenumber m THAT maximize the spatial energy growth in the wake of a blunt-based axisymmetric bluff body. Optimal perturbations with m≠0 lead to the amplification of streamwise streaks in the wake. When forced with finite amplitude m≠1, optimal perturbations have a stabilizing effect on large-scale unsteady vortex shedding in the wake. We show that m≥2 modes, which are forced with zero mass flux, can significantly reduce the amplitude of the unsteady lift force exerted on the body. When combined with low levels of base bleed, these perturbations can completely suppress the unsteadiness in the wake with reduced levels of mass injection in the flow.

Reçu le :
Accepté le :
Publié le :
DOI : 10.1016/j.crme.2017.05.010
Mots clés : Fluid dynamics, Hydrodynamic stability, Flow control
Mathieu Marant 1 ; Carlo Cossu 1 ; Grégory Pujals 2

1 Institut de mécanique des fluides de Toulouse, CNRS–INP–UPS, 2, allée du Professeur-Camille-Soula, 31400 Toulouse, France
2 PSA Peugeot Citroën, Centre technique de Vélizy, 2, route de Gisy, 78943 Vélizy-Villacoublay cedex, France 
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     title = {Optimal streaks in the wake of a blunt-based axisymmetric bluff body and their influence on vortex shedding},
     journal = {Comptes Rendus. M\'ecanique},
     pages = {378--385},
     publisher = {Elsevier},
     volume = {345},
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Mathieu Marant; Carlo Cossu; Grégory Pujals. Optimal streaks in the wake of a blunt-based axisymmetric bluff body and their influence on vortex shedding. Comptes Rendus. Mécanique, Volume 345 (2017) no. 6, pp. 378-385. doi : 10.1016/j.crme.2017.05.010. https://comptes-rendus.academie-sciences.fr/mecanique/articles/10.1016/j.crme.2017.05.010/

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