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Combustion, Explosion and Shock Waves

2017 year, number 6

Numerical Study of Dispersion of a Rough Dense layer of Particles under the Action of an Expanding Shock Wave

T. A. Khmel', A. V. Fedorov
Khristianovich Institute of Theoretical and Applied Mechanics, Siberian Branch, Russian Academy of Sciences, Novosibirsk, 630090 Russia
Keywords: газовзвеси, ударные волны, столкновительная динамика, диспергирование, численное моделирование, gas suspensions, shock waves, collision dynamics, dispersion, numerical simulation

Abstract

Interaction of an expanding shock wave with a layer of particles having a rough surface is considered within the framework of the collisional model of a gas suspension. The influence of roughness on the shape of the contact boundaries in the gas phase and on the boundaries of the cloud of particles is analyzed. The development of the Richtmyer-Meshkov instability is demonstrated. Factors of particle dispersion are determined. Instability evolution is found to increase the amplitude of surface disturbances, and the development of collision dynamics favors smearing of finger-type structures. If the particle motion is essentially random, the pattern of cloud spreading is similar to that observed in experiments.