NUMERICAL-SIMULATION OF MOTIONS OF 2-DIMENSIONAL FLOATING BODIES

A bodies subjected to an oncoming wave train. The model is fully nonli near in that no assumptions of smallness either in wave steepness or i n body motions are made. The basic algorithm is based on a boundary in tegral formulation and time-stepping of the nonlinear free-surface con straints in an Eulerian frame of reference. Simple techniques are devi sed to overcome numerical instability problems that are encountered in the proposed method. The simulation time can be extended over several periods of steady-state oscillations depending on the size of the com putational domain. Several illustrative results simulating large heave and roll motions as well as drifting of a rectangular body are presen ted and discussed. The numerical predictions are also evaluated agains t model tests which include several nonnegligible nonlinear phenomena, and the agreement is encouraging.