Well, here is my entry for the fluid category. It shows how fluids react in 5 different situations. Currently there is no GUI, but it shows the fluids in action pretty well.
And here are some screenshots and video. I'll recommend seeing the video, as pics don't show how the fluids interact. Everything is running in GPU mode as otherwise the fps would crawl down really fast.
Screenshots:
Funnel:
1 and
2
Tube
Boiling Water
Waves
Rotating Object
Videos:
Medium-Res (15.84 MB)
YouTube
Theory is when you know something, but it doesn't work. Practice is when something works, but you don't know why.
Programmers combine theory and practice: Nothing works and they don't know why.