Accurate estimation of the added resistance and added power of a ship in waves is essential to ensure efficient and safe operations at sea. The objectives of this work are to (1) present an efficient means of predicting the added resistance and added power of the KRISO Container Ship (KCS) in regular head waves and (2) investigate the change in added resistance and added power with different wave conditions and model sizes. The predictions are obtained using a high-order boundary element method (BEM) called Aegir and a commercial computational fluid dynamics (CFD) solver, STAR-CCM+. Good comparison is observed between the predictions from Aegir, STAR-CCM+, and published experimental results for calm water resistance. The required CPU time for Aegir is found to be three orders of magnitude less than that of STAR-CCM+. Good agreement is also observed between the body motions and added resistance predicted using Aegir and published experimental results. STAR-CCM+ is used to find the calm water self-propulsion point for the KCS using a propeller body force actuator disk model. The results from Aegir’s added resistance and STAR-CCM+’s calm water power simulations are used together to determine the added power of the KCS in regular, non-breaking head waves using the Resistance and Thrust Identity Method (RTIM). The added power prediction falls along the same trend line with variation in model length scale ratio.

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