Analysis of a Reaction Mechanism for Use in Ejecta Particle Simulations

Ejecta particles play an important role in the investigation of materials in a shocked environment. Ejecta particles are created when a shock travels through a perturbed material interface, creating particles which are released from the surface as a limiting case of the Richtmyer-Meshkov instability. For our study, we focus on metal ejecta transport in an environment that enables chemical reactions on the surface of the particle. The physical consequences of this process, such as particle deformation, mass loss, and energy release, are still being accounted for and are an active area of research. In order to study this phenomenon, mass diffusion and reaction mechanisms are implemented in a Lagrangian multi-physics hydrocode for future use in a fully resolved particle simulation project. We verify the reaction mechanism through the motion of the receding reaction front on the particle/fluid interface and look at the effects of these mechanisms and how they interact with existing FLAG tools. Along with verification of the current mechanisms, the physics of simultaneous diffusion, reaction, and material stresses on the particle and an outline of proposed simulation scenarios will also be discussed.