一种适用于临近空间飞行器大变形的动网格策略*(专题约稿)

对于超大展弦比构型的低速临近空间飞行器而言,在飞行过程中结构变形非常显著,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。本文提出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。文章选取距离倒数的n次方作为权重,首先研究了不同的权重指数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的适用于大变形的情形,并能很好的保证变形后的网格质量。

A Moving Mesh Strategy for Large Deformation of Near-Space Aircrafts

For the high-aspect-ratio near-space aircrafts, they would undergo very large deformation during flight, so it is a highly demand to develop a robust moving mesh method which is capable for large deformation of the boundary. This paper presents a strategy of moving mesh for large deformation. The strategy bases on the mapping interpolation method in which the displacement of node is regarded as the results of the boundaries. In this paper, (1/d)^n is chosen as the interpolation factor. The influence on the mesh quality of the index n was studied, and some 2D/3D moving mesh cases were presented as well. The results suggest that this method is capable to hand the moving mesh cases in which the large deformation is involved.