Ship design and operational planning require methods for predicting ship maneuvering including wave-induced motions. Rapid evaluation of ship motions is presented here by extending a potential flow seakeeping model to include hull maneuvering force coefficients, which include viscous effects. The present method includes incident wave excitation terms arising from hull maneuvering force coefficients. These predicted forces are then used to determine ship motions using two different methods. The first method uses time stepping of forces acting on the ship to determine resulting motions. The second method uses motion response amplitude operators (RAOs) computed in the frequency domain to determine wave-induced motions when the ship is travelling with a specified nominal trajectory in a given seaway. Both methods compute motions much faster than real-time; however, it appears that accurate evaluation of wave-induced motions using RAOs is likely limited to trajectories with limited variation of nominal speed and heading. Validation with experimental data is encouraging for motions predicted using time stepping of forces.
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