자항상태의 모형선에 대한 RANS 수치 시뮬레이션

Abstract

The finite volume based RANS code, WAVIS is extended to analyze the interactions between a ship hull, propeller and rudder. The free surface is captured with the two-phase level-set method and body forces are used to model the effects of a propeller without resolving the detailed blade flow. The propeller forces are obtained using an unsteady lifting surface method based on a potential theory. The overset grid scheme is adopted for easy handling of the rudder grid block. The systematic grid dependency tests are performed to assess the numerical uncertainty. The realizable k- model is used for turbulence closure. Unfortunately, the high fidelity RANS simulation with the huge grid points is still in progress. This is to inform you that the most of the results in this paper are from our previous presentation in the 9th NSH, held in Michigan, USA, on Aug. 5-8, 2007.