波と流れの複合作用を受ける半球形浮体に働く流体力およびその応答

抄録

A floating hemisphere in uniform current and regular waves is analysed based on potential flow theory and low current speed approximation. The perturbation theory based on the expansion of the velocity potential in a power series of current speed is formulated to reduce the boundary-value problem to the integral equation, whose kernel functions involve only the Green's function with zero current speed. The solutions are obtained numerically for the first-order and mean second-order wave forces and responses. It is shown that the wave-excited dynamic responses of the floating sphere are significantly influenced by the presence of current.