Here is a simulation I've just made in 1 week to illustrate a project I had to do for my engineering school. I'll use this during the oral representation.
It simulate an ion thruster (used by spaceships), and you can enable or not a lot of parameters to see how it's working.
I'm using Irrlicht 1.7 / Irrklang / Newton game dynamics.
I'll post a video later, because a screenshot is not so representative of it, in fact there are a lot of mouvements.
green : Xenon atoms
blue : Xenon ions
blue + glow : Accelerated xenon ions