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The present paper presents the CFD result for a beam wave test case. An ONR tumblehome ship model with bilge keels is used. The beam wave test is for zero forward speed and roll and heave 2DOF with wave slope a k =0.156 and wavelength λ =1. 12 L PP , with L PP the ship length. The problems is solved numerically with an unsteady Reynolds averaged Navier-Stokes approach. The free surface flow is computed using a single-phase level-set method and the motions in each time step are integrated using a predictor-corrector iteration approach which uses dynamic overs et grids moving with relative ship motion. The predicted CFD results for motions and forces are compared with experimental data, showing a reasonable agreement. ※Keywords: Roll motion(), Heave motion(), Beam sea(), CFD(), URANS approach ( RANS), Overset grid(), Level-set method() 1.          (linear theory)  : 2007 9 18, : 20082 21 g, irpark@moeri.re.kr, 042-868-7267

Numerical Analysis of Ship Motions in Beam Sea Using Unsteady RANS and Overset Grid Methods