A Study on Viscous Damping Forces of a Slowly Oscillating Vertical Cylinder in Random Waves

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This paper for the first time presents experimental results of the effect of random waves on the slow drift viscous damping forces acting on a vertical circular cylinder. The experiment was carried out using a forced oscillation apparatus, so a wide range of parameter combinations was easy to obtain. The effect of velocity ratio, reduced velocity and period ratio were investigated. Results from the experiment have revealed some different features between the effect of random waves and that of regular waves on the slow drift viscous damping forces. This problem was also studied by a numerical method, in which the hydrodynamic forces were obtained from simulating the flow field using a finite difference method. Results of slow drift viscous damping force coefficients show generally good agreement between computed and measured values.
社団法人日本船舶海洋工学会の論文