A HYBRID BOUNDARY-ELEMENT METHOD FOR 2ND-ORDER WAVE-BODY INTERACTION

A new hybrid numerical-analytical method is developed for the evaluati on of the second-order velocity potential associated with bichromatic incident waves attacking a floating long horizontal cylinder of arbitr ary cross-section, in water of finite depth. The double sum or differe nce frequency velocity potentials may be obtained. An analytical treat ment of the nonhomogeneous free surface condition makes the numerical solution accurate and efficient. The method is tested through a numeri cal example. Results showing the difference frequency sway force and s way response transfer function are presented for practical parameters of a moored vessel in a multi-buoy anchorage.