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Abstract
The two-dimensional response to oscillatory flow of an elastically mounted rigid cylinder is studied experimentally and the results are compared with numerical predictions of the response. The tests are conducted in a U-tube with the Keulegan-Carpenter number, Kc, between 2 and 60, and the ratio of the natural frequency in water to the fluid oscillation frequency, $f\sb{n}/f\sb{w}$, between 1 and 8.6. The results of the experimental portion of the study show that the response of the cylinder depends on both Kc and $f\sb{n}/f\sb{w}$.
Three sets of equations of motion are developed to predict the response of cylinders to oscillatory flow. Two of the models use the relative velocity formulation of the Morison equation for the fluid force inline with the flow; however, each uses different models of the transverse force. The third model considers lift and drag force components parallel and perpendicular to the direction of instantaneous relative velocity between the fluid and the cylinder. (Abstract shortened by UMI.)
