Suction force and multiple frequencies subjected to oscillating cylinder on water surface

Jiang, Zhaobing, Tan, Mingyi and Ma, Shan (2017) Suction force and multiple frequencies subjected to oscillating cylinder on water surface. In Proceedings of the Twenty-seventh (2017) International Ocean and Polar Engineering Conference. pp. 133-137 .

Abstract

The flow field characteristics of modulation instability were widely investigated by many researchers. In marine and offshore engineering involved hydrodynamics, engineers generally care about the forces and then the motions of the structures. In this paper, numerical simulation is presented to investigate the modulation instability due to the forced oscillating cylinder on the water surface and then the force characteristics is focused on and analyzed. The numerical results show that the lift coefficients would be negative with minimum values, which mean that the suction forces would be presented, when the nondimensional parameter is ac >1. However, the lift coefficients would be always positive with ac <1. A constant which is the multiplication of various ac and reciprocal of the averaged lift coefficients is obtained in all cases regardless of the value ac. The motion of the cylinder is monochrome, but the lift force coefficient is not monochrome but with multiple frequencies, which is analyzed using Fast Fourier Transform (FFT).

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