Adjust turbulence noise

I realise that my explosion looks small, it looks like a miniature explosion, not something you’d expect from a C-4 explosion. For me, two settings come into play here: Vorticity and Turbulence. In the Fumefx node, under Simulation>turbulence Noise, make the Scale smaller and play with the Detail slider. This brings more detail into the explosion, making it appear bigger. For me, Scale at 6.4 works, but feel free to experiment. You may find that you need a larger or smaller number for your scene.