Deflagration and detonation modeling of heterogeneous condensed phase explosives

A modeling approach to the deflagration and detonation phenomena is employed to study a variety of explosive scenarios. An engineering model for macroscale reaction of energetic materials over the wide range of explosive reaction from deflagration to detonation is developed based upon solid foundation of two previously developed reactive models. The model is calibrated for the representative explosive PBX-9501 with a number of standard experiments including the strand burner, flyer plate, and rate stick tests. The model is then validated against a number of more complex experiments including the cylinder test and Steven test. Resolution effects for both deflagration and detonation models are explored. Upper bound resolutions are identified for both reaction regimes and implications for large-scale modeling are presented. Work continues in extending the model to represent heterogeneous explosive configurations as homogenous materials. This necessitates implementation of a bulk compaction model, which has yet to be completed. Validation of the bulk compaction model in various scenarios and the resulting thermodynamic state necessitated comparisons with mesoscale simulations. A mesoscale model is implemented from various thermodynamic and material models posed in literature. Validation of the mesoscale models against experiments led to very favorable agreement. Results from varied density granular simulations lead to insight into initiation dependence on initial density, leaving the platform good for comparing bulk scale scenarios for experimentally intractable problems.