Computational method for evaluating meteorites as sources of sonic boom
Résumé
Infrasound is one of survey technique monitoring of nuclear explosions. Hence such explosions have to be distinguished from natural sources of infrasounds such as meteorite atmospheric entries. With a view to investigate meteorites as an infrasound source, numerical simulations of Euler equations are performed around a meteorite of diameter one meter entering the atmosphere at Mach 40. This configuration is selected because it corresponds both to a well documented meteorite case and to previous near-field numerical simulations. Because of the very important amount of released energy and to capture the shock, it is necessary to perform the simulations on an adapted mesh. In addition, to obtain the asymptotic weak shock regime and to initialize the nonlinear ray tracing method used to model the long range propagation, simulations have to be performed very far from the meteorite. The output of the CFD simulations are validated by studies on numerical convergence both in the near-field and far-field, and by comparisons with a theoretical model based on the line source assumptions.
Domaines
Acoustique [physics.class-ph]
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