Abstract
Laboratory experiments have been performed to study the vortex-excited vibration of a circular cylinder in planar oscillatory flow. The variations of transverse response of the cylinder with the frequency ratio fa/fnw (fa: frequency of oscillatory incident flow, fnw : natural frequency of the test cylinder in still water) and Keulegan-Carpenter number, KC, as the function of Scruton number are obtained in the range of. 3<KC<20. The vortex-excited vibration occurs in the range of 4<KC. The non-linear phenomena caused by the fluid-structure interaction are discussed.
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