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Volume 49 Issue 6
Jun.  2023
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Journal of Beijing University of Aeronautics and Astronautics  > 2023  >  49(6): 1311-1318.
ZHANG P H，TANG Y，TANG J，et al. Simulation of cavity flow at high Mach number based on adaptive unstructured hybrid mesh[J]. Journal of Beijing University of Aeronautics and Astronautics，2023，49（6）：1311-1318 （in Chinese） doi: 10.13700/j.bh.1001-5965.2021.0424
Citation: ZHANG P H，TANG Y，TANG J，et al. Simulation of cavity flow at high Mach number based on adaptive unstructured hybrid mesh[J]. Journal of Beijing University of Aeronautics and Astronautics，2023，49（6）：1311-1318 （in Chinese） doi: 10.13700/j.bh.1001-5965.2021.0424
shu

Simulation of cavity flow at high Mach number based on adaptive unstructured hybrid mesh

doi: 10.13700/j.bh.1001-5965.2021.0424

  • Computational Aerodynamic Institute of China Aerodynamic Research and Development Center，Mianyang 621000，China

Funds:

National Numerical Windtunnel Project 

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  • Corresponding author: E-mail：zph2s@sina.com
  • Received Date: 27 Jul 2021
  • Accepted Date: 30 Sep 2021
  • Publish Date: 02 Nov 2021
    Abstract

  • The cavity flow, especially at high Mach numbers (Ma>2), is complicated due to strong shock waves and shear, separation vortices, and their mutual interference. The mesh distribution and the quality of mesh generation thus significantly affect simulation results. The adaptive detector based on unstructured hybrid mesh established by our project team is applied to the numerical simulation of cavity flow at high Mach numbers. The evaluation of standard cavity model verifies that the high Mach number cavity flow with large separation and strong shear can be better simulated by mesh adaptive technique. The effect of flow parameters such as Mach number and Reynolds number on cavity flow characteristics are examined. With the increase of Mach numbers, the dynamic pressure in the cavity increases sharply, the shock effect of free flow and shear layer on the back wall increases obviously, the unevenness of pressure distribution increases, and the pressure peak on the back wall increases gradually. Increasing the Reynolds number leads to an increase in pressure peak at the back wall, and the effect of Reynolds numbers on the pressure distribution of the cavity becomes more significant at high Mach numbers than low Mach numbers.

     

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