No, I don't know of any off the top of my head. There's lots of tutorials out there though. It's not very difficult. Just gotta play around with parameters until it looks the way you want it.
This is a very simple one I did in like 5 minutes when doing some early testing on our project. No where near good enough for real game, but it's not really bad.
I know lots of little tricks to make explosions look realistic and behave like a real explosion should under certain conditions. I also know of a few ways you can simulate shrapnel realistically in games.