Feasibility Study on Numerical Predictions of Resistance and Self-propulsion Performances for a Full Scale Ship

Abstract

RANS (Reynolds-Averaged Navier-Stokes) equation based simulations are performed to predict the performances of resistance and self-propulsion characteristics for a full scale ship. The numerical results are obtained using a RANS based general ship hydrodynamic code, WAVIS that uses a cell-centered finite volume method for the discretization of the governing equations. The free surface is captured using a two-phase level-set method and the EARSM model is used for turbulence closure. The propeller effect is considered as a body force obtained from unsteady lifting surface method for the simulation of self-propulsion condition. The numerical simulations of the resistance and the self-propulsion performances for the target ship are performed in model scale as well as full scale. The experiments for resistance and self-propulsion performances of the target ship, 37K DWT class Bulk carrier, were also carried out at towing tank in KRISO. The numerical results in model scale are compared with the model test results, and the direct calculations in full scale are compared with the full scale prediction by ITTC procedures from the model test data. The differences in numerical results betweenmodel scale and full scale are investigated for resistance and self-propulsion performances, such as nominal wake distributions at propeller plane, total resistance coefficients, thrust deduction factors, wake fractions, hull efficiencies,