To seek a new method to study the Richtmyer-Meshkov(RM)instability
a numerical study was performed for the evolution of the interface between two layers of fluid with different densities using the coupled double distribution function lattice-Boltzmann method(LBM). The research focused on the RM instability and the perturbation growth rates of the interface were presented. The influence of the Mach number upon the perturbation growth rate was explored. The results show that due to the RM instability
the heavy fluid falls to generate a spike and the light fluid rises to form a bubble
and at last the head of the spike changes to mushroom shape. The numerical perturbation growth rate is in agreement with the result by the Zhang-Sohn model. The perturbation growth rises with an increase in the Mach number of shock wave. It can be concluded that the present method is an efficient approach to the simulation for the RM instability and two-phase flow.
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references
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