Resistance and self-propulsion simulations are conducted numerically to investigate the impact of the skeg inclination angle and propeller rotation direction on the powering performance for a twin-skeg ship,Two types of model-scale ships are cal-culated.OpenFOAM is used as the simulation tool.The self-propulsion calculations performed for both inward and outward ro-tation conditions.Compared with the model test results,the numerical calculation results showed a deviation of less than 3％,indicating a high accuracy.The study indicates that inclining the skeg from the vertical position can improve the flow at the stern,reduce the area of low-speed zones and flow separation,and thus decreased the hull resistance.The impact of skeg form and rotation direction on efficiency is primarily reflected in the hull efficiency,where wake uniformity is one of the main factors affecting efficiency.This performance analysis method based on OpenFOAM can be a rapid tool for ship type optimization de-sign.
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