CHINESE JOURNAL OF COMPUTATIONAL PHYSICS ›› 2020, Vol. 37 ›› Issue (5): 505-513.DOI: 10.19596/j.cnki.1001-246x.8121

Special Issue: 第十届全国青年计算物理会议优秀论文

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Investigation of Normal Shock Structure by Using Navier-Stokes Equations with the Second Viscosity

LI Xindong1, ZHAO Yingkui1, HU Zongmin2, JIANG Zonglin2   

  1. 1. Institute of Applied Physics and Computational Mathematics, Beijing 100094, China;
    2. Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, China
  • Received:2019-08-21 Revised:2019-10-30 Online:2020-09-25 Published:2020-09-25

Abstract: To investigate influence mechanism of the second viscosity on internal flow of a normal shock wave, one-dimensional Navier-Stokes equations are numerically solved. It indicates that the second viscosity has a smoothing effect on density, heat flow and energy distribution in the shock wave, which results in a decrease of peak value of heat and entropy flows, and an increase of shock thickness. Due to the production of normal viscous dissipation, some lost mechanical energy is converted into internal energy. As considering the second viscosity, density distribution and shock thickness are greatly improved. They are in good agreement with experimental data. In addition, Knudsen number is obtained 0.12≤Kn≤0.4 within Mach number range from 1.2 to 10. It indicates that Navier-Stokes equations with the second viscosity simulate normal shock structure more accurately.

Key words: Navier-Stokes equations, Stokes assumption, the second viscosity, bulk viscosity, shock wave structure

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