This is the first iPhone (and iPad) application I made.
It is a realtime Navier Stokes equation solver for the iPod, iPhone or iPad. You can draw colors on the canvas using a single finger. When using multitouch gestures you can twist and twirl the fluid and see Navier Stokes in action!
Click the link below to see Navier Stokes in action (youtube-movie):
In this blog post I also explain the algorithm I used for the application.