I need a simple animation (not realistic but animation that visualizes how things work, classy look'n'feel on animation) in length of 5 - 20 s depending how the action can be visualized. In animation will be a straight pipe which is full of water that flows through the pipe. There are particles in the water. Also need to visualize sound waves. I can give exact specs for implementer. I would like to see some reference work that you have done.