再冲击过程中密度比对具有非平衡效应的里氏-梅什科夫不稳定性的影响

IF 2.1 Q2 ENGINEERING, MULTIDISCIPLINARY Inventions Pub Date : 2023-12-13 DOI:10.3390/inventions8060157
Tao Yang, Chuandong Lin, Demei Li, Huilin Lai
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引用次数: 0

摘要

通过离散玻尔兹曼法研究了在不同密度比的重震过程中,双组分系统中的里氏-梅斯科夫不稳定性。对流体力学和热力学非平衡行为进行了详细研究。具体来说,分析的重点是密度梯度、粘性应力张量、热通量强度、热力学非平衡强度和热力学非平衡面积。值得注意的是,非平衡量随着冲击波前沿、稀释波、横波和材料界面的变化而发生复杂变化。从物理角度看,冲击波或二次撞击过后,随着扰动材料界面的扩大,非平衡区域也随之扩大。此外,当传播的冲击波前沿和横波离开或反射的稀释波减弱时,全局非平衡表现也会减弱。此外,随着物理梯度或非平衡区域的增加,全局热力学非平衡效应也会增强。最后,当流体结构在耗散/扩散作用下逐渐消失时,局部非平衡效应会减弱。
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Influence of Density Ratios on Richtmyer–Meshkov Instability with Non-Equilibrium Effects in the Reshock Process
The Richtmyer–Meshkov instability in a two-component system during the reshock process for various density ratios is studied through the discrete Boltzmann method. Detailed investigations are conducted on both hydrodynamic and thermodynamic non-equilibrium behaviors. Specifically, the analysis focuses on the density gradient, viscous stress tensor, heat flux strength, thermodynamic non-equilibrium intensity, and thermodynamic non-equilibrium area. It is interesting to observe the complex variations to non-equilibrium quantities with the changing shock front, rarefaction wave, transverse wave, and material interface. Physically, the non-equilibrium area is extended as the perturbed material interface grows after the passing of the shock wave or secondary impact. Moreover, the global non-equilibrium manifestation decreases when the transmitted shock front and transverse waves leave or when the reflected rarefaction wave weakens. Additionally, the global thermodynamic non-equilibrium effect is enhanced as the physical gradients or non-equilibrium area increase. Finally, the local non-equilibrium effect decreases when the fluid structure gradually disappears under the action of dissipation/diffusion.
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来源期刊
Inventions
Inventions Engineering-Engineering (all)
CiteScore
4.80
自引率
11.80%
发文量
91
审稿时长
12 weeks
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