The animation of the froth is actually done by rotating the vector field. You can slow down the rotation for some variation. What your asking would be better done as a separate particle emitter added to the system emitting smoke rings, columns.
The animation of the froth is actually done by rotating the vector field. You can slow down the rotation for some variation. What your asking would be better done as a separate particle emitter added to the system emitting smoke rings, columns.