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.
Drag Reduction and Transition Delay of Bluff Body Flows by Passive Boundary Layer Control
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Bruneau, C, & Mortazavi, I. "Drag Reduction and Transition Delay of Bluff Body Flows by Passive Boundary Layer Control." Proceedings of the ASME 2002 Joint U.S.-European Fluids Engineering Division Conference. Volume 1: Fora, Parts A and B. Montreal, Quebec, Canada. July 14–18, 2002. pp. 1319-1324. ASME. https://doi.org/10.1115/FEDSM2002-31037
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