URANS assessment of ship extreme roll event in irregular stern quartering sea

Abstract In this study, the extreme roll events of a free-running ONR Tumblehome model in stern quartering seas are predicted by an unsteady Reynolds-averaged Navier–Stokes (URANS) solver coupled with dynamic overset grid approach. The validation study is first performed for prediction ship amplitude regular waves, indicating satisfactory agreement average difference less than 3% between simulation and experimental results. URANS approach then applied to assessment as sailing irregular seas. free 6 degrees freedom (DOF) motions course-keeping control. It concluded that ship’s yaw motion plays important role occurrence sea. A rapid increase angle observed roll, even leading capsizing.