Multi-surface fluid mixing experiments

Here's a set of three videos playing with single FLIP Fluid systems with multiple surfaces. I discuss them in the following blog posts:

Mixing Fluids in Houdini: http://flexmonkey.blogspot.co.uk/2016/12/mixing-fluids-in-houdini.html
Faking Toroidal Eddies in Side FX Houdini: http://flexmonkey.blogspot.co.uk/2016/12/faking-toroidal-eddies-in-side-fx.html