Numerical simulation of the formation of shock induced particle jets using DEM

Abstract eng:
The dispersal of a cylindrical particle ring by a blast or shock wave induces the formation of coherent structures which take the form of particle jets. By the discrete element method (DEM), we performed a quasi-two-dimensional numerical simulation of the shock dispersal of the short cylindrical particle rings. Our study found that during the first hundreds of microseconds, particles around the inner ring surface begin to exhibit the velocity discrepancy. The fast moving particles squeeze into the interior regions, constituting the incipient particle jets. During the outward propagation, the tips of particle jets become blunt, even branch into multiple sub-jets, leading to the increase of the jet number which is a function of the impulsive pressure. The origin of particle jets can be attributed to the heterogeneous network of stress chains which precipitates the non-uniform distribution of particle velocities along the circumference.

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