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ACTA AERONAUTICAET ASTRONAUTICA SINICA ›› 2020, Vol. 41 ›› Issue (2): 123498-123498.doi: 10.7527/S1000-6893.2019.23498

• Fluid Mechanics and Flight Mechanics • Previous Articles     Next Articles

An improved unsteady shock-fitting algorithm

CHANG Siyuan1, BAI Xiaozheng1, CUI Xiaoqiang2, LIU Jun1   

  1. 1. School of Aeronautics and Astronautics, Dalian University of Technology, Dalian 116024, China;
    2. China PLA 95791 Unit, Jiuquan 735018, China
  • Received:2019-09-16 Revised:2019-10-14 Online:2020-02-15 Published:2019-10-24
  • Supported by:
    National Key Research and Development Program of China (2016YFB0200702);National Natural Science Foundation of China (11872144);National Numerical Wind Tunnel Project (NNW2018-ZT4B09)

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: