Abstract
I. Background T HE wake of a bluff body such as a cylinder is characterizedby the formation of vortices at a wide range of ow conditions. The upstream feedback of the vortices induces an oscillatory force on the body, leading to problems such as ow-induced oscillation. The near- eld wake of the cylinder can be viewed as consisting of two free shear layers with opposing senses of vorticity. When the development of the shear layers is altered, the characteristicsof the wake may be controlled.
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