Here is the new Random explosion test using Fumefx 3.5.2 inside 3ds max 2014.
Initially I did it without any background plate in my mind. And it was more of straight fireball explosion (I was trying to get 2 fireball head, first initial one and secondary following that one). But playing more I found out possibility of shape like mini nuke. So driven fuel particles motion like that.
Later I decided to put background plate and comp it.
Also I created grid 35m tall but that wasn't enough height because of expansion and particles speed, so later It ended up being around 70m tall.
I hope you like it.