Numerical Study on Mechanism for Vortex Shedding Suppression by Porous Material

Abstract

Vortex shedding behind bluff bodies slackens off when they are covered with porous materials. To clarify this mechanism we simulate a flow around a circular cylinder covered with a porous material. To solve the fluid flow with a porous interface, we impose a permeable boundary condition in which the transpiration is assumed to be proportional to the local pressure fluctuation. The simulated flow fields are compared with experimental ones and good agreements are obtained. The computation reveals blowing flows at the porous interface play a vital role in the vortex shedding suppression.