Abstract
Hydrodynamic forces acting on vertical circular cylinders forced to surge in low frequencies in regular short waves are measured. Hydrodynamic forces acting on the cylinder forced to surge in combined two harmonic motions in low and high frequencies are also measured. Hydrodynamic coefficients for the slow and fast motions are obtained respectively. These experimental investigations have been done in order to study on the viscous damping force acting on a moored ocean structure in the slow drifting oscillation in irregular waves. Experiments show that the drag coefficients of the cylinder oscillating in low frequencies in waves are quite different from those of the cylinder oscillating in low frequencies in a still water.
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