During maneuvers, propellers’ operation differs from their design due to strong modification of the wake field with respect to the straight-ahead motion. The consequent modification of the loads overstresses the mechanical components of the shaftline, exacerbates propeller side effects and worsens overall efficiency. Therefore, the analysis of these situations in the early design phase is pivotal to increase the operation capabilities and safety at sea. This task relies on novel tools capable to accurately predict the complex flow field that develops past the hull and the propeller loads. Since the solution of the fully coupled problem with the rotating propeller by viscous flow solver is impractical for routine applications, hybrid approaches are a viable alternative. In this paper, an interactive RANSE/BEM methodology is presented, where the propeller is replaced by rotating body forces that map the actual loading state of the blades, allowing a fully unsteady analysis of hull–propeller interaction. The methodology is applied to the straight ahead and $8.4°$ pure drift motions of a twin screw propulsive configuration. Last, but not least, the study presents a validation study with accurate experimental data of the nominal wake field and single blade loads.

中文翻译：

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用于非设计条件下船体-螺旋桨相互作用分析的广义混合RANSE / BEM方法

在操纵过程中，螺旋桨的操作与设计不同，这是因为尾流场相对于直行运动有很大的变化。随之而来的负载变化会加重轴的机械组件，加剧螺旋桨的副作用，并降低整体效率。因此，在早期设计阶段对这些情况进行分析对于提高海上作战能力和海上安全至关重要。该任务依赖于能够准确预测经过船体和螺旋桨载荷而形成的复杂流场的新颖工具。由于使用粘性流求解器解决旋转螺旋桨的完全耦合问题在常规应用中是不切实际的，因此混合方法是一种可行的选择。本文提出了一种交互式RANSE / BEM方法，螺旋桨被旋转的车身力所取代，后者根据叶片的实际负载状态进行映射，从而可以对船体与螺旋桨的相互作用进行完全不稳定的分析。该方法适用于直截了当和$8.4°$双螺杆推进配置的纯漂移运动。最后但并非最不重要的是，该研究提出了一项验证研究，其中包含标称尾流场和单叶片载荷的准确实验数据。