Acoustic-wave effects in violent bubble collapse

The effects of acoustic-wave propagation both outside and inside a radially collapsing and rebounding bubble are examined. This is done by comparing computational results produced by various reduced-model equations with benchmark results produced by numerical solution of the Euler equations under adiabatic conditions. Numerical inaccuracy associated with the moving bubble surface is avoided by means of a coordinate transformation that yields a fixed surface coordinate. Comparisons of calculated bubble-radius histories and peak surface pressures show that, while acoustic-wave effects in the external liquid are important, such effects in the internal gas are not.