  We present a simulation for the interactions of shockwaves with light
spherical density inhomogeneities. Euler equations for two-phase compressible
flows are solved in a 3D uniform resolution finite volume based solver using
5th order WENO reconstructions of the primitive quantities, HLL-type numerical
fluxes and 3rd order TVD time stepping scheme. In this study, a normal Mach 3
shockwave in air is directed at a helium bubble with an interface Atwood number
of -0.76. We employ 4 billion cells on a supercomputing cluster and demonstrate
the development of this flow until relatively late times. Shock passage
compresses the bubble and deposits baroclinic vorticity on the interface.
Initial distribution of the vorticity and compressions lead to the formation of
an air jet, interface roll-ups and the formation of a long lasting vortical
core, the white core. Compressed upstream of the bubble turns into a mixing
zone and as the vortex ring distances from this mixing zone, a plume-shaped
region is formed and sustained. Close observations have been reported in
previous experimental works. The visualization is presented in a fluid dynamics
video.
