Slow drift damping force acting on a horizontal cylinder |
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Authors: | Changhong Hu Wataru Koterayama |
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Institution: | (1) Interdisciplinary Graduate School of Engineering Sciences, Kyushu University, 816 87 Kasuga, Japan |
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Abstract: | The hydrodynamic forces acting on a circular cylinder and a rectangular cylinder undergoing slow drift oscillation in regular
waves were investigated experimentally and numerically. Forced oscillation tests with low frequency and large amplitude in
regular waves and forced two-harmonic oscillation with combined low and high frequencies were carried out in the experimental
study. In the numerical study a finite-difference method was used to simulate viscous flow around a two-dimensional oscillating
cylinder. The results of experiments showed that a horizontal rectangular cylinder oscillating slowly in waves has much higher
damping coefficients than one oscillating in two-harmonic mode, while the numerical study indicated that such differences
in the damping coefficient arise partly from the different effects of one-direction harmonic flow and rotating flow on the
vortex shedding caused by the slow drift oscillation. |
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Keywords: | slow drift viscous damping wave effect horizontal cylinder model experiment numerical simulation |
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