非结构动网格在可动边界问题中的应用研究

Applications of Dynamic Unstructured Grids Method Unsteady Flows Involving Moving Boundaries

本文对用于非结构动网格生成的弹簧近似方法进行了研究。通过采用顶点弹簧方法,分析研究了弹簧倔强系数的取值,同时通过引入挤压倔强系数和边界修正,对标准弹簧近似方法进行了改进。改进后的方法可以大大提高网格变形能力和网格质量。应用本文发展的非结构动网格生成方法并通过耦合求解基于(ArbitraryLagrangian-Eulerian ALE)描述的Euler方程,模拟了谐和振动NACA0012翼型及M6机翼的跨音速绕流,计算结果与参考文献提供的结果及实验结果吻合良好。

A spring analogy method for dynamic unstructured grids was studied. The stiffness of the springs in the modified vertex spring analogy was analyzed. The improvements that considering squash stiffness and boundary effect was adopted to the standard method. The applications of the improved spring analogy, method to 3D grids generation show that the new method largely improves the deforming ability and the quality of grids. Coupled with 3-D ALE Euler solver, this dynamic unstructured grid method was applied to simulate unsteady transonic flow about NACA 0012 airfoil and M6 wing. The computational results are in good agreement with those of other literatures.