There are some awesome simulations in the SimScale project library. Though I am quite fond of anything involving fluid flows, the one simulation I liked most so far is the structural dynamic analysis of a [deep drawing process][1].
Just take a look at this [video][2] and think: “Is it not simply awesome that those kind of things can now be simulated in a web browser?”
[1]: Public Simulation Projects Library | SimScale | Page 1
[2]: https://www.youtube.com/watch?v=H-dZ-krCeiM