The design of high-speed vessels is always a challenging job for naval architects. The semi-empirical and analytic methods widely used today are based on gross hull parameters, limiting their applicability and accuracy. These methods do not provide details of the flow around the hull and therefore cannot be applied to some design concepts like stepped hulls. It becomes more challenging when associated appendages are used in the design, like lifting strakes, spray rails, trim tabs, ventilation pipes, etc. Those designs are usually driven by experience or a trial and error process. In this paper, we present numerical studies on multiple high-speed yachts with different appendage configurations, e.g., different layouts of spray rails and/or lifting strakes, different trim tabs, etc., to illustrate how computational fluid dynamics (CFD) can help to guide the design process. The RANS-based CFD tool, SimericsMP+, is used for all simulations and results are compared to towing tank tests and sea trial data. Significant agreement is shown with experiments, including those effects due to appendages, and results can be achieved with practical turnaround times on a single workstation.

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