text: This paper presents simulation results of the structural response of a surface vessel advancing in head seas. In this particular fluid-structure interaction problem, the discretized geometry in the fluid domain is significantly different than that of the structuralmodel. It is therefore necessary to use interpolation to transfer information between the two domains. In this paper we discuss a numerical procedure to obtain the dynamic response of a marine vessel based on fluid-structure interaction as applied to the test case of the S175 container ship. The vessel is advancing in head seas, and the sea conditions result in bow-flare and bottom impact slamming. The fluid and structure interact in a one-way coupled scheme where the fluid stresses are applied to the structural modal model. The simulation results are compared to previously published experimental data.