Sensitivity of Particle Size in Discrete Element Method to Particle Gas Method (DEM_PGM) Coupling in Underbody Blast Simulations
US ARMY TARDEC WARREN United States
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In this paper, the capability of two methods of modelling detonation of high explosives HE buried in soil viz., 1 coupled discrete element and particle gas methods DEM-PGM and 2 Arbitrary Lagrangian-Eulerian ALE, are investigated. The ALE method of modeling the effects of buried charges in soil is well known and widely used in blast simulations today 6. Due to high computational costs, inconsistent robustness and long run times, alternate modeling methods such as Smoothed Particle Hydrodynamics SPH 7 and DEM are gaining more traction. In all these methods, accuracy of the analysis relies not only on the fidelity of the soil and high explosive models but also on the robustness of fluid-structure interaction. These high-fidelity models are also useful in generating fast running models FRM useful for rapid generation of blast simulation results of acceptable accuracy 8-14. In this paper, the effect of sensitivity of particle size in the performance of the DEMPGM blast simulation is compared to that of the ALE blast simulation method. The main focus of this study is to understand the strengths of DEMPGM and identify the limitationsstrengths compared to the ALE method. Discrete Element Method DEM can model individual particle directly, and displace independently which is based on Cundall and Strack.