Unsteady Vortex Structures in the Wake behind Bluff Bodies

Unsteady Vortex Structures in the Wake behind Bluff Bodies

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Unsteady vortex structure in the wake behind bluff body was experimentally investigated by wind tunnel experiment.A flexible rectangular plate, which was made of a grandpas best soft polyurethane block, shows the sway motion and flow-induced vibration caused by fluid force.Phase-averaged vortex structures behind the flexible plate were educed p1006-1420eg by Particle Image Velocimetry (PIV) using light sensors.

The size of recirculation region and upwash flow in the wake were influenced by unsteady motion of the plate vibration.