In order to study the influence of rainstorm on parachute dropping, the smoothed particle hydrodynamics/arbitrary Lagrangian–Eulerian coupling method is proposed. Finite elements are used to describe the continuous material such as fabric and air flow field, and the smoothed particle hydrodynamics particles are used to describe the discrete raindrops. The coupling between different fluid and structure is realized by penalty function. In order to distinguish the most influential factor of rainstorm environment on parachute, the effects of raindrop field and wind field in rainstorm are studied, respectively. It could be found that the raindrop fields with different droplet sizes have little effect on the parachute’s shape, opening shock, and performance according to the comparative analysis, while the vertical wind field has a great influence on parachute’s deceleration performance. The wind field, not the raindrop field, is the most important factor affecting the parachute’s deceleration performance. The method and conclusions in this article could provide some references for parachute design.

中文翻译：

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基于光滑粒子流体动力学/任意拉格朗日-欧拉耦合方法的暴雨对降落伞空投影响的数值研究

为了研究暴雨对降落伞降落的影响，提出了平滑粒子流体动力学/任意拉格朗日-欧拉耦合方法。有限元用于描述连续材料，如织物和空气流场，平滑粒子流体动力学粒子用于描述离散雨滴。不同流体和结构之间的耦合是通过惩罚函数实现的。为了区分暴雨环境对降落伞影响最大的因素，分别研究了雨滴场和风场对降落伞的影响。通过对比分析可以发现，不同液滴尺寸的雨滴场对降落伞的形状、打开冲击和性能影响不大，而垂直风场对降落伞的减速性能影响很大。风场，而不是雨滴场，是影响降落伞减速性能的最重要因素。本文的方法和结论可为降落伞设计提供一些参考。