Vorticity evolution on a separated wavy wall flow

This paper is concerned by the study of 2D incompressible and unstready flow over a wavy wall. The numerical procedure is based on the full Random Vortex Method algorithm. The use of a conformal mapping make it gridless. Separation and reattacheemnt mechanisms are tackled through the Lighthill mechanism relating the streamwise pressure gradient with the injected flux of vorticity at the wall. Different post-processing for the pressure and the wall shear stress allow the caracterization of unsteadiness sources in the shear layer and the recirculation. Finally drag reduction by considering the competition between the pressure drag and the viscous drag is adressed