Houdini – Rapid River Whitewater
Water simulation : 9h
Whitewater (foam/bubbles) simulation : 8h
Rendering time 1080p / 310 frames : 14 days. (1h10 per frame)
Space disk : 2 To
Dual Xeon E5-2687w (32 threads)
64 Go Ram
I recommend to use Linux for heavy simulation, because Linux has a better ram usage than windows.
It takes me more than 64 Go on Windows, and only 34 Go on Linux.