A higher-order boundary element method (HOBEM) with Rankine source as the kernel function is adopted. Then, a 3D time-domain seakeeping analysis tool has been newly developed. The computational domain is rectangular and travels at ship's speed. An artificial damping beach for satisfying the radiation condition was installed at the outer portion of the free surface. For updating kinematic and dynamic freesurface boundary conditions, an iterative time-marching scheme is employed to achieve numerical accuracy and stability. The problem of a ship advancing forward in incident waves is simulated, and the resultant diffraction forces acting on the hull are evaluated to validate this numerical model. To investigate the hull-form effects on naval hydrodynamics, three modified Wigley models are used for comparative study. Wave exciting forces on these three different Wigley models over a wide range of incident-wave frequencies are calculated and analyzed. Finally, the corresponding unsteady wave patterns around the hulls are illustrated and discussed.

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