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ISSN オンライン: 2642-0554

NUMERICAL INVESTIGATION OF THE STABILITY AND CONTROL OF SEPARATING BOUNDARY-LAYER FLOW

Matthieu Marquillie
Université de Nice-Sophia Antipolis Laboratoire J.-A. Dieudonné Pare Valrose; F-06108 Nice Cedex 2; CNRS, UMR 8107, F-59650 Villeneuve d Ascq; Univ Lille Nord de France, F-59000 Lille, France

Uwe Ehrenstein
Université de Nice-Sophia Antipolis Laboratoire J.-A. Dieudonné Pare Valrose; F-06108 Nice Cedex 2; Aix Marseille Univ, IRPHE UMR 6594, CNRS, F-13384 Marseille 13, France

要約

A boundary-layer flow along a bump is investigated numerically. At the rear of the bump the flow separates and the separation bubble becomes unstable above a critical Reynolds number. The resulting vortex shedding is reproduced numerically. Performing a local linear stability analysis of velocity profiles inside the separation bubble, it is shown that there is a relationship between a local absolute instability and the numerically observed global flow behaviour. First numerical experiments of flow control, reducing the recirculation length using blowing and suction, are performed as well.