Abstract
The active control mechanisms of vortex shedding from a circular cylinder in a uniform flow by rotary cylinder oscillations are investigated by measuring the pressure distributions and by visualizing the flow around the cylinder with sampling the angular velocity of the cylinder simultaneously. Here, the rotary cylinder oscillations are controlled by the reference velocity signal in the wake with some phase lags. A clear reduction in the unsteady lift forces is observed by the active controls. The simultaneous observation of the phase averaged pressure distributions, the visualized flow fields and the cylinder rotations indicates that the rotary cylinder oscillations with the optimum phase control decelerate the accelerated flow on one side of the cylinder and accelerate the decelerated flow on the other side of the cylinder, which results in a reduction in the time-variation of shed circulations and forms the suppressed vortex pattern in the flow visualization pictures.
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