Sammendrag
A vessel traveling across the sea experiences waves. The waves produce forces on the vessel resulting in added resistance. The forces are caused by the combination of wave and vessel motion. A variety of methods for prediction of added resistance in waves exists. The complexity and accuracy varies significantly. This paper focuses on numerical solution of the problem when the waves are high compared to the vessel size. The commercial software Star-CCM+ is used to solve the Navier-Stokes equations by use of Reynolds averaging and a VOF model. This implies that all kind of nonlinearities are accounted for. Accurate numerical propagation of a 5th order Stokes wave is achieved. A study on the mesh and time step sensitivity of the added resistance is presented. The numerical results are validated by custom made model test. A numerical comparison of two alternative surge restrictions (constant speed or constant force) shows insignificant differences in results.