Comparison of Different Propeller Models in CFD Simulation of Pure Loss of Stability in Regular Stern Quartering Waves

The International Maritime Organization (IMO) has issued guidelines for direct stability assessment, recognizing pure loss of stability as a failure mode leading to large roll motions or capsizing in large waves. This paper uses the CFD solver STAR-CCM+ to simulate pure loss of stability for ONR Tumblehome in stern-quartering waves. Ship motions with moving rudders were simulated using dynamic grids, with rudder deflection controlled automatically. Two propeller models were used: a fully modelled rotating propeller and a body force model. Simulations at different speeds show consistent trends with experimental data in maximum roll angles. Forces and moments on individual appendages like rudders and propellers were analysed at a specific speed.