Numerical analysis of added resistance in regular waves using dynamic overset grid scheme

Abstract

In this study, the analysis of 2DOF (2 Degree Of Freedom) motion and added resistance of a ship in regular head waves is carried out using RANS (Reynolds Averaged Navier-Stokes) approach. In order to improve the accuracy for large amplitude motions, the dynamic overset scheme is adopted. SUGGAR++ which is the dynamic overset scheme library is applied to WAVIS2, the in-house RANS code of KRISO (Korea Research Institute of Ships and Ocean Engineering). The grid convergence test is carried out using the present scheme before the analysis. The target hull form is KRISO VLCC tanker (KVLCC2) and 13 wave length conditions are applied. The added resistance coefficients, heave and pitch motion RAO computed by using Suggar++ are compared with those from the experiment. The present scheme shows the improved results comparing with the non-inertial reference frame based solver. It is confirmed that the dynamic overset scheme has the advantage for the large amplitude motion cases.