Free access article

ESAIM: Proc., 1999, Vol. 7, pp. 104-119
DOI: 10.1051/proc:1999010

Active control of cylinder wakes: use of base suction and blowing

Y. Delaunay and L. Kaiktsis

Institute of Energy Technology Department of Mechanical and Process Engineering ETH Zentrum, Zurich, CH-8092, Switzerland

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.

© EDP Sciences, ESAIM 1999

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