1137 On fluttering of a flexible sheet in uniform water flow : Visualization of the flow-field around it
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Fluttering is a self-excited oscillation which happens with a slender object in flow. We have investigated fluttering characteristics of a flexible sheet in uniform water flow using a silicone rubber sheet and a vinyl sheet. The cross-sectional shape of the sheet in flow was visualized by a laser sheet method and its behavior during fluttering was photographed by using a high speed video camera. The frequency, wavelength and amplitude of traveling-wave on the sheet during flutter were analyzed from the visualized images. Additionally, flow-fields around the sheet during fluttering were visualized.
