流体—固体瞬态动力耦合有限元分析研究

Transient dynamic analysis of fluid-structure coupling problem by FEM

本文应用有限元法探讨了流体与固体的瞬态动力耦合分析 .利用拉氏乘子法 ,给出了流体与固体接触面上一种接触约束单元 ,将流体与固体动力耦合内力作为基本未知量 ,使流体域与固体域有机地联系成一整体 ,从而实现了流体—固体动力耦合系统的统一分析 .文中还推导了流固动力耦合系统的有限元控制方程 ,编制了计算程序 .数值计算结果验证了耦合模型的正确性及其较高的计算精度 ,并表明固体的变形效应对于流体—固体系统的动力响应是显著的 .

Transient dynamic analysis of fluid\|structure coupling problem is studied by using FEM. The Lagrangian multiplier method is applied to establish the contact constraint element at the interface between fluid and rigid body. The fluid and structure are considered as integrity in the analysis. Further more, the dynamic governing equation used in FEM analysis is deduced. The transient dynamic response of fluid\|structure is obtained by solving the dynamic governing equation. The validity and accuracy of the model are verified by the computational results of FEM. It is found that the deformation effect of the structure is important to the dynamic response of the fluid\|structure coupling system.