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EXPERIMENTAL INVESTIGATION OF KELVIN-HELMHOLTZ INSTABILITY IN A CONFINED RECTANGULAR GEOMETRY, WITH TURBULENCE

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We have experimentally investigated the development of Kelvin-Helmholtz vortices on each side of a tape moving at high speed at the free surface of a rectangular pool of water. Depending on the boundary conditions, a recirculation of the flow can occur at the bottom of the tank or along the tape lateral sides, with formation of vortices and turbulence. Depending on the geometry of the tank, a transition from a 3D to a 2D flow is observed that can lead to relatively well organized Bénard Von Karman streets without the classical forcing of the wake behind an obstacle. The selection of vortex spacing is in agreement with a theory developed by Rosenhead for point street vortices in the complex plane.

Author(s):

Paul Boniface    
Laboratoire MSC
France

Luc Lebon    
Laboratoire MSC
France

Laurent Limat    
Laboratoire MSC
France

Mathieu Receveur    
Laboratoire MSC
France

Fabien Bouillet    
Saint-Gobain Recherche
France