半球形伞流固耦合工程算法

Engineering analysis method in fluid-structure interaction problem of hemispherical parachute

降落伞流固耦合模拟非常难以实现,而一些工程设计任务要求迅速高效地完成.为了适应该要求,针对稳定下降阶段的半球形伞,提出了一种流固耦合工程算法.以轴对称伞形为伞衣初始形状,通过流场模拟得到结构模拟所需的伞衣压力系数分布,通过结构模拟得到新的伞衣外形,如此循环,直到伞衣中幅线和伞绳外形趋于稳定为止.结果表明,伞衣外形能迅速收敛,该方法能满足工程设计要求.

To carry out fluid-structure interaction （FSI） parachute simulation is difficult, but some engineering design work demands that the operation completes quickly and efficiently. Therefore, to meet this requirement, an engineering fluid-structure interaction simulation method was established to simulate the stage of hemispherical parachute stable descent. Supposing the initial canopy shape is axis-symmetric, the canopy＇s pressure coefficient needed by structural simulation was computed from flow field simulation, and the new canopy shape was obtained from the structural simulation. This recycle procedure was repeated until the canopy gore centerline shape and parachute line shape were stable. The results show that the canopy shape can be quickly converged, and the method satisfies the engineering demands.