Abstract
The effects of active flow control, using base mass transpiration as control action, on the stability and dynamics of the cylinder wake at low Reynolds numbers are investigated, using numerical simulation. A spectral element method is used for the simulation. It is found that, in the subcritical Reynolds number regime (Re ‹ 47), slight suction destabilizes the wake, resulting in a vortex shedding pattern. In the supercritical regime, slight blowing stabilizes the flow, whereas high enough suction results in a steady and strongly asymmetric field. Further increase of the suction flow rate makes the flow steady and symmetric. The results are interpreted qualitatively, based on hydrodynamic stability considerations.
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