The impact of ion mixing and viscosity on the evolution of Richtmyer-Meshkov instability

Hybrid fluid-PIC (particle-in-cell) simulations aimed at a better understanding of the effect of ion diffusion and viscosity on the evolution of Richtmyer-Meshkov instability (RMI) under high temperature and high density conditions are described. The use of the hybrid fluid-PIC method, which treats ions as the traditional particle-in-cell method and electrons as a massless fluid, is motivated by the difficulty of handling material mixing in the context of commonly used fluid simulations. The superdiffusive behavior observed at the plasma interface is primarily attributed to the kinetic effect, which exerts a considerable influence on the evolution of the RMI. Applying time-varying viscosity and diffusion corrections to the analytical model of Carl & egrave;s and Popinet results in a high degree of alignment between the simulation outcomes and the theoretical predictions. These discussions contribute to a more detailed understanding of the physics of ion mixing and its effect on the evolution of RMI in the inertial confinement fusion implosion.