Numerical study of non-uniformity effect on Richtmyer-Meshkov instability induced by non-planar shock wave

WANG Zhen; WANG Tao; BAI Jingsong; XIAO Jiaxin

doi:10.11883/bzycj-2018-0342

Volume 39 Issue 4

Mar. 2019

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WANG Zhen, WANG Tao, BAI Jingsong, XIAO Jiaxin. Numerical study of non-uniformity effect on Richtmyer-Meshkov instability induced by non-planar shock wave[J]. Explosion And Shock Waves, 2019, 39(4): 041407. doi: 10.11883/bzycj-2018-0342

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WANG Zhen, WANG Tao, BAI Jingsong, XIAO Jiaxin. Numerical study of non-uniformity effect on Richtmyer-Meshkov instability induced by non-planar shock wave[J]. Explosion And Shock Waves, 2019, 39(4): 041407. doi: 10.11883/bzycj-2018-0342

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Numerical study of non-uniformity effect on Richtmyer-Meshkov instability induced by non-planar shock wave

doi: 10.11883/bzycj-2018-0342

WANG Zhen^1
,,
WANG Tao¹,
BAI Jingsong^{1, 2
,
,},
XIAO Jiaxin³

1.
Institute of Fluid Physics, China Academy of Engineeing Physics, Mianyang 621999, Sichuan, China
2.
National Key Laboratory of Shock Wave and Detonation Physics, Institute of Fluid Physics, China Academy of Engineeing Physics, Mianyang 621999, Sichuan, China
3.
Science and Technology on Space Physics Laboratory, Beijing 100076, China

Received Date: 2018-09-11
Rev Recd Date: 2019-01-18

Available Online: 2019-04-25

Publish Date: 2019-04-01

Abstract

Abstract

Based on the Navier-Stokes equations, the large-eddy simulation code MVFT (multi-viscous-flow and turbulence) was applied to numerically study the Richtmyer-Meshkov instability (i.e. RMI) for a perturbed interface, which is driven by a non-planar shock wave with Ma=1.25 in uniform and non-uniform flows with Gaussian distribution of the initial density. The simulation results show that the interface evolution of the RMI induced by non-planar shock wave is affected by the non-uniformity of the initial flows. Before reshock, the growth of the disturbed interface increases with the increasing of the non-uniformity flow field for either φ=0 or φ=π. However, these discrepancies are reduced as the flow enters the turbulent mixing. Further quantitative analysis of the circulations and high-order fluctuating velocity correlation in the flow field reveal the mechanisms for the aforementioned regulations. In addition, it is found that the interface evolution of the RMI induced by non-planar shock wave is different from that driven by planar shock wave. The mechanism for the difference is the influence of the initial vorticity of non-planar shock wave and the vorticity generated by the shock-interface.
- Richtmyer-Meshkov instability,
- non-uniform flow,
- non-planar shock wave,
- larger-eddy simulation

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References(20)

References

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