The aim of this work is to control the flow around obstacles by a passive strategy. The idea is to modify the boundary flow in order to delay the instabilities and reduce the drag forces and the vorticity production.The target is achieved using a porous interface between the solid body and the fluid. This is easily handled by means of a penalization method that allows to modelize different media by changing the penalization parameter. The results for low and high transitional flows around a 2D square show that the porous interface is an efficient tool to control the flow dynamics. In addition, a drag reduction up to 28% is observed.
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