Bubble Burst

An air bubble is injected into water at high speed and bursts through the water surface. Dynamic aspects crucially influence the shape of the bubble and the mechanism of the burst. Comparison with experiments show that the physics of this multi-phase system with high viscosity ratio is accurately reproduced.

To start with, let's have a side view of the problem.

And then, the same thing seen from above:

And finally, a cut to see what happens inside the bubble:

You may have detected the little jet inside the bubble. It is due to the high velocity at which the bubble is injected: the low pressure behind the bubble encourages the fluid to enter in the form of a thin jet. This phenomenon is also observed in lab experiments. The following is a comparison with [T. Séon, A. Antkowiak: Phys. Fluids 23, 091103 (2011)]: