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Linear dynamics of a boundary layer flow over a cylindrical rugosity

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Over the past years, cylindrical roughnesses immerged within a boundary layer flow have been used as a possible way to delay transition to turbulence. However, for some particular setups, transition can actually occur right downstream the rugosity. The purpose of the present work is to investigate the transition induced by symmetric and anti-symmetric mechanisms by means of direct numerical simulations, global linear stability analysis and eventually linear optimal perturbation.

Author(s):

Jean-Christophe Loiseau    
Laboratoire DynFluid - Arts et Métiers ParisTech
France

Jean-Christophe Robinet    
Laboratoire DynFluid - Arts et Métiers ParisTech
France

Emmanuel Leriche    
Laboratoire de Mécanique de Lille - Université Lille 1
France