The physical explosion of a high-pressure and cylindrical dense gas (SF6) cloud has been simulated with the use of large eddy simulation (LES), and hybrid high-order schemes have been employed to solve the LES equations. Our results show that, while the shockwave is exploding from the SF_6 to the air, it bifurcates into the reflected rarefaction wave and the transmitted shock, and a reverse shock also appears. The rarefaction wave moves inward first, the Richtmyer-Meshkov (RM) instabilities occur as the transmitted shock accelerates the interface between the SF_6 and the air. Later, the rarefaction wave merges with the reverse shock, and finally converges at the origin of the cloud, which generates a strong circular reflected shock, and makes the flow field complex.
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