An investigation of the multi-mode Richtmyer-Meshkov instability at a gas/HE interface using Pagosa

Ren, Jiaojiao; Culp, David B.; Smith, Brandon; Ma, Xia

doi:10.1016/j.camwa.2022.03.046

Cited by 1 publication

(1 citation statement)

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“…In 2021, Tang et al [51] adopted the Euler equations to study the single-mode RM instability induced by the convergent shock wave and observed that the amplitude perturbation grows more rapidly and the nonlinearity becomes more pronounced as the Atwood number increases. In 2022, Ren et al [52] used the hydrocode Pagosa to explore the multimode RM instability with a variety of initial conditions, including differing the number of modes, Atwood number, and perturbation type. Up to now, the study of the Atwood number or density ratio has mainly involved the macroscopic aspect.…”

Section: Introductionmentioning

confidence: 99%

Influence of Density Ratios on Richtmyer–Meshkov Instability with Non-Equilibrium Effects in the Reshock Process

Yang,

Lin,

et al. 2023

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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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Section: Introductionmentioning

confidence: 99%