79 / 2023-04-13 09:16:52

A three-dimensional physical configuration model for the rapid transition to turbulent flows in Richtmyer-Meshkov instability with reshock

turbulent mixing

辐射和流体力学 > 流体力学不稳定性

The rapid transition in Richtmyer-Meshkov instability (RMI) with reshock has been confirmed both in numerical simulations and experiments in the past few years. However, there still lack a clear physical understanding and a detailed configuration model. In this letter, we propose an alternative three-dimensional physical configuration model for the rapid transition in RMI with reshock. The coexistence of the corotating and counter-rotating vortices is hypothesized to induce large-scale strain fields. It provides a successive source for the apparent iterative cascade, together with the amplification of inertial-scale strain fields and viscous dissipation of small scale. The unified frame of the all-scale strain fields describe the development process of RMI with reshock, e.g. vorticity deposited by the reshock, formation of the coexistence of the corotating and counterrotating vortices, iterative cascade under the amplification of the strain fields and viscous dissipation to internal energy. This configuration model would provide theoretical suggestions for the design of practical applications, such as the mixing inhibition in inertial confinement fusion and mixing enhancement in scramjet engines.