These simulations are made up of 20,000-1,000,000 "grains of sand" being pushed around by "the wind". The wind's velocity at any point is a function of the coordinates of the point.

Comes with some builtin example sandboxes, but you can make your own as well!

Go to github.com/pommicket/FunctionSandbox to see the source code for this.

You can see a demo video here, but video compression is not good with tiny things moving around very quickly: https://www.youtube.com/watch?v=_lPOPs5EKUg