A previously developed method which solves for the diffraction potential on the hull subject to the presence of a single propeller (HULLFPP) is coupled with a Vortex Lattice Method (MPUF3A) which solves for the unsteady sheet cavitation on the propeller blades. Systematic studies on grid dependence of cavity solution, propeller forces and hull pressure fluctuations are performed in the case of single propellers. The effects of the presence of tunnel wall or free surface on the predicted pressure fluctuations on the hull are also investigated. The method is then extended to the case of twin propellers. Comparisons between the numerical results and those measured in existing experiments are presented.

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