A numerical model is being developed to solve for six-degree-of-freedom forces experienced by a cavitating, stepped planing hull. An approach to solving the cavitation or ventilation problem is described. Next a method for solving for spray roots on the hull is detailed and a method for approximating the transom wake for a 3 dimensional planing hull is discussed. Results of the cavity solver for a three-dimensional linear solution are presented. Finally results in the context of three-dimensional planing hull steady resistance simulations are presented and compared to RANS CFD and tow tank experiments.

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