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A three-dimensional numerical simulation employed with particle trajectory model is implemented to simulate particle-gas interaction in spherical ejecta problem, in which particles are ejected from a shocked sample surface. The particles' initial distribution is modelled due to characteristics of ejection processes and references data. And action on gas of the moving sample surface is simulated by using ghost fluid coupling Eulerian-Lagrangian method. Only a steady drag force between particles and gas is considered at present. The evolutions of gas flow and particle movements are shown in this paper. It is concluded that the particle cloud naturally changes into a high-density low-velocity region and a low-density high-velocity one. This qualitatively agrees with ejection experimental acquaintance.

A three-dimensional numerical simulation of particle-gas mixing in an ejection with a spherical sample surface