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Multiphysics Simulations Supersonic nozzle flow against a flat plate, showing density (grey) and vorticity (colors). Read More >

Rocstar Simulation Cutaway of a joint slot in the Space Shuttle solid motor showing inhibitor fluid-structure interaction. Read More >

IMSim Modeling Suite

Insensitive Munitions Simulation Suite

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IMSimFlow

What are insensitive munitions (IM)? A munition is broadly defined as ammunition and/or artillery that can be used in combat, such as gunpowder, bullets, bombs, missiles, mines, etc. Insensitive munitions are stable enough to withstand mechanical shocks, fire, impact by shrapnel, extreme weather conditions, long-term storage, etc. while still functioning as intended during a military event.

Why is research and understanding of IM important? On July 29, 1967, in the Gulf of Tonkin’s waters off Vietnam, a rocket misfired on the USS Forrestal supercarrier. The rocket struck a fuel tank, causing a fire that killed or injured hundreds of crewmembers, took nearly a day and immense resources to quell, and resulted in damage of more than half a billion dollars. These kinds of accidents involving munitions, propellants, and other types of energetic-material interactions can occur in scenarios ranging from civilian airline flights to NASA missions to energy-production facilities. Identifying and predicting the potential causes these types of catastrophic accidents will decrease the financial cost as well as decrease the number of injuries and fatalities of national and allied defenses while increasing the exactness and execution of battle strategies.

What is IMSim? IMSim (Insensitive Munitions Simulation) is an integrated system for mesoscale modeling and analysis of energetic materials. The IMSim simulation suite predicts the behavior of heterogeneous energetic materials through multiscale, multiphysics simulations using validated computational models.

The goal of this system is to enable scientists and engineers to perform predictive response simulations for existing and new energetic material designs, allowing for safe assessment of IM scenarios, where we can bridge the gap between mesoscale structure and effects, and the macroscale response that is required. This system brings together software designed

This modeling and simulation effort focuses on multiscale, multiphysics simulations using validated models on high performance parallel computing platforms. Our multiscale approach to modeling and simulation explicitly addresses physical features and phenomena at the macro-(device), meso- (aggregate of crystals) and micro- (individual crystal) scales in an integrated fashion.

IMSim is composed of several critical modules: Shape3D, Stat3D, Prop3D, Rocpack, and CTM2D. The IMSim process initiates with nondestructive characterization of the as-cast material at the mesoscale (or production of idealized mesoscale packs with our Rocpack packing code), then moves to statistical characterization of the experimental energetic, and concludes with a prediction of chemothermomechanical properties of interest in cookoff. The first-generation package is able to simulate the thermal degradation and steady-state combustion stages of a cookoff scenario. The thermal runaway and transition to deflagration or detonation stage remain to be addressed.