The influence of inertial effects on the mean forces and moments on a ship sailing in oblique waves Part B: Numerical prediction using a RANS code

The present paper shows that a clear distinction between hydrodynamic and inertial contributions to mean wave forces and moments acting on a ship is especially important when using experimental data to validate numerical computations. Time averaged inertial contributions can have a significant influence on these forces and moments. Thus, it is important to either add inertial contributions to the numerical computations when comparing to experiments or to precisely determine the motions during the model tests and subtract these effects from the measurements. This procedure is applied to a twin screw passenger ship, which has been extensively investigated in a recent research project at the Technische Universität Berlin. By comparison with experimental data, it is shown that the used RANS code Neptuno is capable of predicting well the mean wave forces and moments for a ship in oblique incoming regular waves of arbitrary length and that the inertial contributions cannot be neglected for an accurate comparison.