一种改进的非定常激波装配算法

doi:10.7527/S1000-6893.2019.23498

Abstract

Abstract: Based on the unstructured dynamic grids technique and the cell-centered finite volume method, an improved unsteady shock-fitting algorithm is proposed to deal with unsteady flow containing moving shock waves. First, for the problem of shock wave propagating along the straight/curved wall, the motion models of wall discontinuity nodes are built respectively. Second, automatically distributing the discontinuity nodes on the basic of Bézier curve fitting method is realized to ensure fitted shock wave fronts move in a wide range without distortion. Then, by embedding the local module with automatic re-meshing, the efficiency and automation of the algorithm are significantly improved. Finally, for the motion of shock wave intersection point, a method of calculating velocity vector using displacement is designed to yield a fitting solution. Several simulation results show that the proposed algorithm can effectively deal with shock wave propagation problem. Compared with the shock-capturing method, the proposed method can extract much more flow field information and obtain a more straightforward and clearer map of flow field discontinuity.

Key words: shock-fitting, unsteady, unstructured dynamic girds, finite volume method, computational fluid dynamics

CLC Number:

V211
O354.5

CHANG Siyuan, BAI Xiaozheng, CUI Xiaoqiang, LIU Jun. An improved unsteady shock-fitting algorithm[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2020, 41(2): 123498-123498.

References 27

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An improved unsteady shock-fitting algorithm

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