Abstract
The flow around a circular cylinder in a uniform flow under the injection of oscillatory slit flow is measured by particle image velocimetry and the mechanism of flow control is studied. The measurement has shown that the flow properties change considerably with the forcing Strouhal number. The analysis of power spectrum indicates that the magnitude of fluctuating velocites at the natural frequency is surpressed by the control and corresponding area is reduced. The visualization study indicates that the roll-up vortices generated by the oscillatory slit flow develops along the shear layer and interacts with the vortices from the other side of the shear layer, which results in a weakening of the vortex shedding downstream.
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