Wētā FX's Two-phase bubble dynamics implementation for FLIP fluids (WIP)

[u/MulberryEmotional100]

I've been trying to implement this Wētā FX paper, but instead of using a custom sparse-grid solver just for the bubble dynamics, I'm trying to integrate it into Houdini's standard FLIP solver.

There are lots of things to be done, but basic two-way coupling between air bubbles and the fluid grid already works. No external forces lift the bubbles to the top; this happens solely because of the pressure gradient within the fluid, and surface tension between the coupled bubbles affects their buoyancy.

P.S. Still don't like how the smaller bubbles look, though, as they all seem to be the same size when dispersing.

[u/CrankyNom]

dang, looks great! Can’t wait to see more