Simulations of Hot-Spot Initiation with Reactive Kinetics for Shocked TATB*

Under mechanical or thermal insults, micron-sized pores created due to defects or impurities are embedded in high-energetic material and might collapse generating high-temperature regions, leading to ignition. A multiphysics computational study is undertaken to understand the formation, ignition and growth of these hot spots. Two-dimensional high-resolution simulations are performed on an axisymmetric pore configuration in a shocked TATB material using \textsf{ALE3D}. \textsf{ALE3D} is a massively parallel multiphysics framework using an arbitrary Lagrangian-Eulerian (ALE) approach and includes thermal transfer, hydrodynamics, and chemistry along with an extensive suite of advanced EOS models. Further, a reactive kinetics model has been used to capture the chemical processes occuring in TATB. We will present results obtained from these large-scale simulations and discuss key thermo-hydro-chemical processes leading to hot-spot initiation.