The prediction of ship motions and added resistance based on RANS

In this paper, numerical predictions of ship motions and added resistance in regular head waves by solving the unsteady Reynolds average Navier-Stokes (RANS) equations with a shear-stress transport (SST) K-ω turbulence model is presented. Volume of fluid method (VOF) is applied for the treatment of the free surface. The Wigley III ship model has been computed using the unsteady RANS solver Fluent. The simulations have been carried out to measure the heaving and pitching motions in regular head waves which covered seven different wavelengths. The Froude number of the hull are 0.2, 0.3 and 0.4. By comparing the results with the strip theory based results and experimental data, the unsteady RANS method shows better accuracy in predicting ship motions.