For long time simulation of floating body motions, an artificial damping zone is applied to satisfy radiation condition at the end of numerical wave tank. This artificial damping zone works as an efficient absorber of fully nonlinear waves at the tank end. Combination of this artificial damping zone and wave maker works as an absorbing wave maker. The implementation, the characteristic and the efficiency of this artificial damping zone are reported.
Using the damping zone as a wave absorber and an absorbing wave maker, a moored two dimensional body motions in regular waves are simulated by the fully nonlinear simulation method based on the velocity and acceleration potential theories. The simulated body motions, wave periodic motions and slow drift motion, are presented in comparison with measured motions in wave basin. The simulated motions show good correspondence with the measured motions in overall.
For the simulation of wave periodic motions of body, a numerical technique to accelerate convergence of the simulation is also given.