규칙파 중 전진하는 선박 주위의 유체역학적 응답에 대한 비정상 RANS 해석

Abstract

he present paper provides a CFD analysis of the ship forward diffraction problem using an unsteady RANS simulation method, a WAVIS code. The WAVIS viscous solver adopting a finite volume method has the 2nd order accuracy in time and field discretizaions for the RANS equations. A two phase level-set method and a realizable k-ε turbulence model are adopted to compute the free surface and to meet the turbulence closure, respectively. To validate the capability of the present numerical methods to simulate an unsteady progressive regular wave, computations are done for three grids with refinement ratio of . The main simulation is performed for a DTMB5512 model with a forward speed in a regular head sea condition. The validation of the present numerical method is carried out by comparing the present CFD results with available unsteady experimental data published in the 2005 Tokyo CFD Workshop: resistance and heave force and pitch moment, unsteady free surface elevations and velocity fields.