Assessing the Drag Law for an Explosively Driven Particle using Experiments and Uncertainty Quantification*

Although commonly used in point-particle simulations, analytic models expressing the hydrodynamic forces on a particle have not been thoroughly tested and validated in the extreme conditions of the explosive regime. Recent shock-tube experiments and simulations have shown that the Maxey-Riley-Gatignol particle force equation extended for compressible flows captures the evolution of particle force induced by the shock-particle interaction, but effects of the contact interface were not examined. The current work assesses the predictive capability of the model for the case where a particle is strongly affected by the shock and contact produced by the detonation of an explosive charge. Simulations are performed using a finite-volume, Euler-Lagrange code with the JWL EOS to handle explosive products. Accounting for various experimental uncertainties, simulated particle trajectories are compared with experimental particle positions following the explosive ejection of a particle from a rigid barrel into a region of ambient air.