The above is a splash screen of Houdini 9.5.
I tried to reimplement the scene in Houdini 19.5.

around H18 Pyro changed a bit to not use fuel based combustion within the solver
allegedly for more artdirectability in favor of using SOP level Pyro Source Spread SOP

this made dynamic ignition and spreading nontrivial
you can probably still hook it up using Gas Combustion DOP node

but maybe better is to follow this Masterclass and implement one of the newer models according to Jeff walkthrough
https://www.sidefx.com/tutorials/h18-pyro-building-a-combustion-model/ [www.sidefx.com]

tamte
around H18 Pyro changed a bit to not use fuel based combustion within the solver
allegedly for more artdirectability in favor of using SOP level Pyro Source Spread SOP

this made dynamic ignition and spreading nontrivial
you can probably still hook it up using Gas Combustion DOP node

I did not use fuel or any combustion model. I just coupled a pyro solver and a flip solver in a dop network.

ifree
I did not use fuel or any combustion model. I just coupled a pyro solver and a flip solver in a dop network

Ah, sorry, I though it was a question,now I see it's in work in progress section
The video looked so similar to what I remember that you got me fooled, good job, haha