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Bi-stability of the turbulent wake past parallelepiped bodies with various aspect ratios and ground effect

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Recently, bi-stable properties of the turbulent wake past the Ahmed reference body has been observed [3]. A parametric study is performed to detail the conditions of existence of such bi-stable flow by changing the ground clearance and the aspect ratio of the base (height/width). The preliminary measurements show that the underbody flow is not a necessary condition and the presence of the floor does not necessarily prevent a bi-stable behavior in the vertical direction.

Author(s):

Mathieu Grandemange    
ENSTA ParisTech / PSA Peugeot Citroën
France

Marc Gohlke    
PSA Peugeot Citroën
France

Olivier Cadot    
ENSTA ParisTech
France