Non-Linear Vibration of a Vortex-Excited Cylinder in Planner Oscillatory Flow

Abstract

Laboratory experiments have been performed to study non-linear vortex-excited vibratidn of a circular cylinder in planar oscillatory flow. The relationship between the transverse response of the test cylinder and the frequency ratio fnw/fd (fnw: natural frequency of cylinder in water, fd: frequency of oscillatory incident flow) are obtained for four values of Keulegan-Carpen ter number (KC KC=10, 17, 25, 50). The non-linear phenomena caused by the fluid-structure interaction in this vortex-excited vibration are discussed.