Advances in interfacial instability induced by reshock

Abstract

The interactions of a moving shock wave with fluid interface lead to complex flow phenomena, including shock reflection and refraction, interface evolution, and even turbulent mixing at its late stage. These phenomena are of great significance in nature and engineering applications. When an incident shock wave sweeps over the interface, the interface morphology varies, making the interface perturbations grow from linear to nonlinear stages due to the baroclinic and pressure disturbance mechanisms. When a reshock wave passes the already distorted interface, the generation and transportation of vorticity will change the original developing mode of interface instability, resulting in different physical phenomena and developing rules. As the generation and control of the reshock waves are more complicated than those of the single shock scenarios, it is a great challenge to investigate the reshock-induced interface instabilities. In this article, progresses of experimental, numerical, and theoretical studies on the interface instability and turbulent mixing under reshock are reviewed. The effects of initial conditions, such as interface shape, shock strength, and reflection distance, on the reshock-induced interface instability are discussed in both planar and converging shock scenarios. The future research priorities and directions are finally proposed.