Abstract
This paper describes the vortex structure around a flat plate of finite width placed on a ground plane. The experiment was carried out in a circuit-type wind tunnel having a 100 mm × 100 mm working section of 1500 mm length at the Reynolds number of 3.64 × 10^3. Instantaneous velocity vectors in the flow field around a flat plate were measured by use of a particle image velocimetry(PIV). Consequently, it is found that the horseshoe vortex moves close to the flat plate with increase in the width-to-height ratio W/H, and this motion of the horseshoe vortex gives rise to unsteady behavior of the vortices shedding from the top edge of the flat plate. It is suggested that this unstable behavior disturbs the shedding vortex structure along the span-wise direction, and leads to a disappearance of shedding arch vortices.
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