基于有限元法的流体与结构的耦合研究

Coupling Research of Fluid and Structure Based on Finite Element Method

对有限元法离散流固耦合方程进行了简要的介绍,给出了粘性流体与弹性结构的全耦合模型。流体采用k-ε湍流模型进行了有限元计算,采用ALE描述实现固体Lagrangian描述到流体Eulerian描述的过渡,使大变形带来的流体域网格畸变得以避免。对流固耦合方程,采用流固全耦合的迭代算法进行了迭代求解,最后模拟了高雷诺数下湍流流动中冲击致使涡轮结构旋转的过程。计算结果表明,流固耦合的算法是可靠的。

The process of the fluid-solid coupling equation discretized by finite element method is simply introduced. It also gives the full coupled model of viscous fluid and elastic structure. The finite element calculation of the fluid is carried out by using k-εturbulence model. Using ALE description achieves the translation from the lagrangin description of solid to the Eulerian description of the fluid to avoid the mesh distortion of the fluid grid caused by the great deformation. Fluid solid coupling equation iterative solution is carried out by using iterative algorithm fluid-solid coupling. Finally, the rotating process of turbine structure caused by turbulent flow impact in high Reynolds number is simulated. The calculation results show that the fluid solid coupling method is reliable.