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对于超大展弦比构型的低速临近空间飞行器而言,由于其在飞行过程中结构变形非常显著,因此基于计算流体力学的分析方法对于动网格提出了非常高的要求。为此,提出了一种适用于边界大变形的动网格策略,该种动网格基于映射的思想,将边界网格的位置变化以某种权重反映到流场网格,并更新网格节点位置。选取距离倒数的n次方作为权重,研究不同的权重指数n对网格变形的影响规律,然后开展了二维与三维动网格实例分析。结果表明,这种动网格方法能够很好地适用于大变形的情形,并能很好地保证变形后的网格质量。
For low-speed adjacent spacecraft with large aspect ratio configuration, computational fluid dynamics (CFD) -based analytical methods place very high demands on moving grids because of their significant structural deformation during flight. For this reason, a dynamic grid strategy suitable for large deformation of boundary is proposed. Based on the idea of mapping, this kind of moving grid reflects the position change of boundary grid with some weight to the flow field grid and updates the grid Node location. The n-th power of the inverse of the distance is selected as the weight to study the influence of different weight index n on the deformation of the grid, and then the two-dimensional and three-dimensional moving grid examples are analyzed. The results show that this kind of moving grid method can be well applied to large deformation and can well guarantee the quality of the deformed grid.