The hydrodynamic investigation of a hull’s performance is a key aspect when designing a new prototype, especially when it comes to a competitive/racing environment. This paper purports to perform a fully nonlinear unsteady Reynolds Averaged Navier-Stokes (RANS) simulation to predict the motion and hydrodynamic resistance of a sailboat, thus creating a reliable tool for designing a new hull or refining the design of an existing one. A comprehensive range of speeds is explored, and results are validated with hydrodynamic full-scale tests, conducted in the towing tank facility at University of Naples Federico II, Italy. In particular, this work deals with numerical ventilation, which is a typical issue occurring when modeling a hull; a simple and effective solution is here proposed and investigated, based on the phase-interaction substitution procedure. Results of the computational fluid dynamic (CFD) campaign agree with the experimental fluid dynamic (EFD) within a 2% margin.

中文翻译：

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帆船船体的非稳态RANS CFD模拟及与全尺寸试验的比较

在设计新原型时，尤其是在竞争/竞赛环境中，对船体性能进行水动力研究是一个关键方面。本文旨在执行完全非线性的非稳态雷诺平均航海斯托克斯（RANS）模拟，以预测帆船的运动和流体动力阻力，从而为设计新船体或改进现有船体提供了可靠的工具。探索了广泛的速度范围，并通过在意大利那不勒斯费德里科二世大学的拖船设施中进行的水动力全尺寸试验验证了结果。尤其是，这项工作涉及数值通风，这是在对船体建模时发生的典型问题。本文提出并研究了一种简单有效的解决方案，基于相交互作用替换过程。计算流体动力学（CFD）活动的结果与实验流体动力学（EFD）一致，误差在2％以内。