A 3D Rankine source method is developed to solve the initial-boundary value problem of two ships advancing in waves. Linear wave effects are considered. The two ships are assumed advancing parallel with identical forward speed, with or without stagger, and the Neumann-Kelvin flow is chosen as the steady basis flow. An artificial numerical beach is applied to satisfy the radiation condition. A fourth order Runge-Kutta method is used for the 12 degree of freedom dynamic solver of the two ships. The present solver is validated through studying linear radiation and diffraction problem of one or two ships by comparing with analytical or model test results. The coupled motion solver is applied to a single S-175 ship advancing in waves and two parallel advancing ships which were tested in the MARINTEK towing tank (Ronæss, 2002) and promising agreements are obtained.

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