Medium-speed catamarans are the latest development in fast marine transportation. Reliable methods to estimate the calm water performance and to predict the powering for the full scale vessel are necessary. For this paper RANSE-based methods were used to predict the total resistance for medium-speed catamarans for various hull forms, speeds and scales using both an open-source and commercial solver. For the Froude numbers of interest (0.3 ＜ Fr ＜ 0.5) an absolute relative error of 10% and below could be achieved compared to model and full scale test results.
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