This paper describes numerical evaluation of radiation and diffraction forces for a ship travelling in a seaway at moderate forward speed. The method was developed with the objective of providing efficient and robust force predictions in both the frequency and time domains. For evaluation of radiation and diffraction forces, it is assumed that the ship travels with quasi-steady speed and heading. Time domain computations can include nonlinearities in buoyancy and incident wave excitation forces through evaluation of pressures on the instantaneous wetted hull surface. The paper describes various aspects of the numerical implementation, and also describes limitations that have been determined through verification and validation.

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