Abstract
Alternating vortices are generated by an oscillating plate when a plate is abruptly started to oscillate from rest. It is an interesting problem to examine the flow around the plate. We analyze the flow around a flat plate acting in a combination of rotational and translational oscillations in a stationary fluid, using a discrete vortex model with the conformal mapping method. Numerical calculations are performed for various angles in rotational oscillation, amplitudes in translational oscillation, and frequencies and phase angles in both oscillations, Vortex patterns and unsteady forces are obtained. As a result, vortex clusters stay near the plate. The thrust on the plate is generated by these clusters.
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