A One-Way Coupled Euler and Parabolic Model for Outdoor Blast Wave Simulation in Real Environment

Abstract

Aerial blast wave propagation is affected by numerous physical parameters such as the source energy, the topography, the ground nature, or the atmospheric conditions. Direct high performance computing simulations is a valuable tool, but remains extremely costly in complex environment which limits the number of simulations. It is best used locally or to build reference solutions useful for the evaluation of simplified fast running models. Indeed, as the blast wave propagates, its strength weakens and after some distance, linear acoustic theory may be valuable. Here, we present the results of a one-way coupling procedure between a nonlinear Euler direct simulation code for the near field, including the detonation phase, and a parabolic linear acoustic model for the far field. Both models take into account for topography and atmospheric conditions. We show that, compared to the full Euler simulations, the coupling procedure provides accurate results at a reduced computational cost for blast wave propagation in the vicinity of an actual pyrotechnic site. The quality of the signals is also improved in comparison with classical parabolic simulations started with an analytical solution.