The present work has been performed in the context of the European H2020 project increased SAfety and Robust certification for ditching of Aircrafts and Helicopters (SARAH) dedicated to improving the safety during aircraft ditching, together with a better understanding of the physics involved during those crucial events. Both numerical and experimental aspects are explored during this project. The present study focuses on the application of the smoothed particle hydrodynamics (SPH) method to the simulation of helicopter ditching, as this method has proved to be particularly adapted to free surface impact cases. Simulations are performed for three different impact configurations, for which the numerical solutions are compared with the experimental results (forces and kinematics) obtained at the wave basin of Ecole Centrale Nantes on a mock-up shape provided by Airbus Helicopters. Elements of sensitivity analysis are also provided when needed, to assess the role of some parameters involved in the helicopter behavior and the fluid pressure forces exerted during the impact.

中文翻译：

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利用平滑粒子流体动力学模拟直升机开沟

目前的工作是在欧洲H2020项目的背景下完成的，该项目针对飞机和直升机的沟渠提高了安全性和鲁棒性（SARAH），致力于改善飞机沟渠的安全性，并且对这些关键事件所涉及的物理原理有了更好的了解。在这个项目中，无论是数值方面还是实验方面。本研究的重点是平滑粒子流体动力学（SPH）方法在直升机排水沟模拟中的应用，因为该方法已被证明特别适用于自由表面撞击情况。针对三种不同的冲击配置执行了模拟，将数值解与空中客车直升机公司提供的模拟形状在南特中央高校波浪盆地获得的实验结果（力和运动学）进行比较。必要时还提供敏感性分析元素，以评估直升机行为中涉及的某些参数的作用以及在撞击过程中施加的流体压力。