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Numerical Simulations of Ship Self-Propulsion and Maneuvering Using Dynamic Overset Grids in OpenFOAM

Dynamic overset grids provide a powerful tool for CFD calculations that model relative motion between body components. This paper presents a new overset method utilizing OpenFOAM to simulate the self- propulsion and maneuvering of ships. The method uses one set of overset cells fixed to the Earth, a second set fixed to the hull, a third set rotating with the propellers, and a fourth set rotating with the rudders. Prescribed motions move the propeller and rudder blocks relative to the hull, and the entire hull assemblage moves relative to Earth using 6-DOF motions derived from CFD forces. A digital autopilot controls rudder rotation for course keeping. Overset boundary conditions and hole cutting are updated dynamically at run time for every time step. The method is demonstrated using two ship models for which extensive validation data exists: the Japan Bulk Carrier (JBC); and the Office of Naval Research Tumblehome ship (ONRT). JBC self-propulsion results include cases with and without an Energy Saving Device (ESD). ONRT results include free running maneuvers in regular head seas and quartering waves.

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