Comptes Rendus
Adding streamwise streaks in the plane Poiseuille flow
[Additionner des streaks dans l'écoulement de Poiseuille plan]
Comptes Rendus. Mécanique, Volume 337 (2009) no. 3, pp. 179-183.

Dans des études récentes, des streamwise streaks, engendrés avec des éléments de rugosité, ont été utilisés pour retarder la transition à la turbulence. La hauteur maximale de ces éléments de rugosité est limitée par l'apparition d'instabilité dans leur sillage proche, ce qui limite l'amplitude maximale des streaks qu'ils peuvent produire. Ici nous montrons que des streaks de grande amplitude peuvent être engendrés en « additionnant » des streaks d'amplitude inférieure par l'utilisation de lignes multiples d'éléments de rugosité.

In recent investigations, finite amplitude streamwise streaks, generated with roughness elements, have been used to delay transition to turbulence. The maximum height of these roughness elements is limited by the appearance of instabilities in their near wake, therefore putting a limit on the maximum streak amplitude they can produce. Here we prove that large amplitude streaks can be generated by ‘adding’ lower amplitude streaks with multiple arrays of roughness elements.

Reçu le :
Accepté le :
Publié le :
DOI : 10.1016/j.crme.2009.03.012
Keywords: Fluid mechanics, Streaks, Control
Mot clés : Mécanique des fluides, Streaks, Contrôle d'écoulements

Martin Hollands 1 ; Carlo Cossu 2

1 École polytechnique, 91128 Palaiseau cedex, France
2 Laboratoire d'hydrodynamique (LadHyX), CNRS-École polytechnique, 91128 Palaiseau cedex, France
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Martin Hollands; Carlo Cossu. Adding streamwise streaks in the plane Poiseuille flow. Comptes Rendus. Mécanique, Volume 337 (2009) no. 3, pp. 179-183. doi : 10.1016/j.crme.2009.03.012. https://comptes-rendus.academie-sciences.fr/mecanique/articles/10.1016/j.crme.2009.03.012/

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