降落伞流固耦合问题的数值模拟和流场分析

Numerical simulation of parachute fluid-solid coupling problem and flow analysis

提出了基于压力耦合的半隐式算法,即SIMPLE(Semi-Implicit Method for Pressure-Linked Equations)算法和生成阶梯网格方法的对稳定下降阶段的降落伞进行数值模拟的新方法.此方法在降落伞流固耦合计算中具有较好的稳定性和较高的效率.对降落伞稳定下降阶段的流固耦合问题进行了数值模拟.降落伞模型分别采用了圆形伞和锥形伞稳定下降时的结构数据,并对锥形伞模型进行了不同来流攻角情形下的模拟.与平行有限元方法相比,采用SIMPLE算法的新方法得到了更准确和更合理的结果.此新方法可以作为传统数值模拟方法的一个可靠替代和重要补充.

A new numerical simulation method for predicting parachute fluid-solid coupling problem using semi-implicit method for pressure-linked equations （SIMPLE） algorithm is proposed. The both coupling computation and flow field analysis during terminal descent stage are proved efficient through sample analyses using this new simulation method. The simulations of a flat circle parachute and a cone-shaped parachute suggest a fine efficiency and good stability of the new method. The test problems for the new method are about the terminal descent stage, since the ordinary numerical simulation method（the parallel finite element method） is general used in this field. Comparing with the result gained by the parallel finite element method. The results of the new method are also proved accurate and reasonable. Flow field characteristics at various angles of attack are further simulated for the cone-shaped parachute model. The new method is an alternative and a complement to the ordinary numerical simulation method.