any idea on how to tart this effect like the lebra tar pits. i was thinking a smoke sim then meshing that than have it interact with a liquid sim for base mud.
If you need large bubbles moving to the surface and popping, I suggest using solid sphere geometries that would represent the bubbles and using a source in surface force mode animated from zero to a small outgoing velocity once they reach the surface. The Phoenix foam is not meant to push away liquid particles and is designed for a large amount of small bubbles.