基于SPH方法的降落伞展开过程数值研究  

Numerical Study of Parachute Spreading Process Based on SPH Method

作　　者：孙鹏[1] 陈晨[1] 李凤鸣[1] 程涵[1] 

机构地区：[1]中国民航飞行学院,四川广汉618307

出　　处：《计算机仿真》2017年第8期89-94,共6页Computer Simulation

基　　金：国家自然科学基金(11602293)

摘　　要：在降落伞展开过程的数值模拟中,为解决因流场网格畸变需要流场网格重构,而造成大量计算资源消耗的问题。提出了以SPH粒子代替传统网格来描述流场的计算模型,伞衣结构仍采用有限元网格描述,通过二者之间相互穿插实现最终的模型装配,并采用基于罚函数的接触算法实现耦合计算。获得了开伞过程中伞衣结构和流场的动态变化过程。仿真结果表明,开伞后伞顶塌陷和随后出现的"呼吸"现象与风洞试验结果基本一致。验证了SPH方法可以用于降落伞开伞过程计算,为充气织物的数值研究提供了新的参考。In the numerical study of parachute spreading process, reconstruction of flow field mesh costs a large a- mount of resource consuming due to mesh distortion. To solve this problem, a computational model is proposed to de- scribe the flow field with SPH particles instead of traditional mesh while the canopy structure is still described by the finite element mesh. The final model assembly is achieved by the canopy and flow field, the contact algorithm based on penalty function is used to realize the coupling calculation. The dynamic processes of model structure and flow field are obtained during parachute spreading. Simulation results show that the collapse phenomenon and the ＂breath- ing＂ phenomenon appeared on the top of the parachute are validated by results of wind tunnel test. It is verified that the SPH method can be used to calculate the parachute spreading process and can provide a new reference for the nu- merical study of inflatable fabric.

关 键 词：降落伞 数值模拟 流固耦合 有限元 

分 类 号：V244.21[航空宇航科学与技术—飞行器设计]