Development of Instabilities in Internal Structures Produced by an Explosions

The shock wave generated by the instantaneous release of energy in the centre of a closed domain, its subsequent rebound and reflections are studied in this article. Three cases are simulated where the Mach number of the wave is Ms = 2, 5 and 10. As a result of the interactions between a low-density central zone and the shock waves, the Ritchmyer-Meshkov instability is produced, which is manifested by the breaking of the flow symmetry. The results of the simulations are compared with those presented in previously published works (starting point of the symmetry breaking and the reflected pressures on the walls). The Euler equations are solved using the Kurganov, Noelle and Petrova (KNP) scheme with the rhoCentralFoam solver of the OpenFOAM software, due to the fact that in previous works it has been shown to be able to study with adequate accuracy the representation of wave reflection phenomena on straight walls.