A higher-order BEM (boundary element method) for seakeeping problems in the frame of linear potential theory is newly developed to predict radiation forces of a modified Wigley hull with forward speed. In this 3-D time domain approach, a rectangular computational domain moving with the same forward speed as a ship is introduced. For time-saving, only half computational domain is adopted due to the geometric symmetry of a ship. An artificial damping beach is installed at an outer portion of the free surface except the downstream side for satisfying the radiation condition. The velocity potential on the ship hull and the normal velocity on the free surface are obtained directly by solving the boundary integral equation, with the Rankine source used as the kernel function. The unsteady waves generated by a modified Wigley hull with forward speed are calculated. The forced oscillation tests in heave and pitch motions in a towing tank are also carried out. Then numerical results are compared with corresponding experimental data and other numerical solutions. Finally, the results are analyzed and discussed.

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