This paper presents an application of a panel desingularized method based in time domain for the calculation of wave induced motions for a ship advancing in waves.

The fluid domain has been described using a structured grid from which flat quadrilateral panels are derived. Rankine singularities have been placed at a small distance from every panel center, which represents the point where the boundary element conditions are collocated. The major advantage of this choice consists in reducing the computational effort, especially when non linear effects are considered, provided an adequate desingularizing distance is selected.

The boundary conditions has been applied on the mean body wetted surface and the free-surface is considered at the calm water level.  The velocity potential computed on the free-surface at a certain time-step allows to update the kinematic and dynamic boundary conditions, referring to an Eulerian time-stepping integration scheme. Once the current value of potential is obtained, the pressure on the mean hull surface has been calculated and forces and moments are given by the integration of pressure on the body.

The adequacy of the results has been verified applying the code to different typologies of marine vehicles and comparing the numerical output with corresponding experimental data freely available in literature.

In addition, a comparison with other numerical method based on different theories has been done, in order to analyze the advantages provided by this methodology in particular respect to frequency domain methods.