非结构动网格在变后掠翼气动问题中的应用

Dynamic Unstructured Grids Methed with Applications to Unsteady Flows Involving Wings Sweeping Back

对非结构动网格生成的弹簧近似方法进行了研究。采用了顶点弹簧方法,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。应用此非结构动网格生成方法并通过耦合求解基于ALE(Arbitrary Lagrangian-Eulerian)描述的Euler方程,模拟了作简谐振动的NACA64A010及M6机翼变后掠状态下的跨音速绕流,计算结果与实验结果吻合良好。

Spring analogy method for dynamic unstructured grids has been studied. The stiffness of the springs in the modified vertex spring analogy has been analyzed. Improvements that considering squashing stiffness and boundary effect has been adopted to the standard method. Applications of the improved spring analogy method to 3- D grids generation show that the new method greatly improves the deforming ability and the quality of the grids. Coupled with 3-D ALE Euler solver this dynamic unstructured grid method has been applied to simulate unsteady transonic flow about 3-D wings sweeping back. Computational results are in good agreement with those of experiment.