Deformation of a shock wave under strong compression of nonspherical bubbles

The deformation of a radial convergent shock wave appearing inside a spheroidal cavitation bubble under strong compression is studied. It is shown that the shock wave in the course of its convergence can be deformed strongly. In particular, initially the most convex parts of the contour of the surface of the shock wave in its axial cross section can first become rectilinear and then be transformed into concave regions. Along with the formation of concave regions in the contour, sharpenings appear in it. Further small rectilinear regions can be formed instead of sharpenings. In the considered cases of initially elongated and flattened bubbles, the closure of the shock wave begins in the center of the bubble, just as under the closure of a spherical shock wave in an ideal spherical bubble.