Simulation of particle ejecta effects from the surface under impulse action

This paper presents research results of ejecta due to plane shock wave arrival at a free smooth surface of a homogeneous pattern in the cluster dynamics (CD) simulation. Provided are 3D simulation results illustrating that ejecta effect is not only due to the physical reasons but also due to the side computation effects. One-dimensional model is developed to study the problems of cluster motion. This model was used to analyze the cluster behavior when a shock wave arrives at the boundary of the pattern. The oscillation character of the near-boundary clusters was analyzed as well as the impact of the interaction potential anharmonicity. It is shown that the most high-frequency mode of oscillations of the cluster lattice defined by potential anharmonicity (with neighbors moving in opposite phase) plays an important role in side ejecta effects. Hence, the criteria was developed to define the threshold loading velocity associated with ejecta in 3D problems. thod is suggested to eliminate the ejecta computation effects using the modification of cluster motion equations. The efficiency of this method is verified in a number of 3D simulations. It is shown that the suggested approach eliminates the side ejecta effects and keeps the fundamental physical regularities of loading and further motion of the pattern.