Hi, I'm trying to ignite a molotov cocktail. With axiom its easy, I have fuel on the one side, remove temperature and add temperature back on the oder side at a specific point and the fire expands from there.

With the inhouse solver I can't quite get it to work. I got fuel, density and v on the left and from the right I'm trying to ignite with temperature and burn. I thought it would expand from there but I only get a fixed block of fire.

How does it work actually? I got warying points so nothing for the pyro spread I guess.

the Sparse Pyro solver doesn't come with combustion model by default, instead it expects flame to be directly sourced from upstream

For spreading flame simulations his can be done using Pyro Source Spread SOP before the solver

or alternatively you can watch Jeff's talk about implementing one of more advanced combustion models
https://www.sidefx.com/tutorials/h18-pyro-building-a-combustion-model/ [www.sidefx.com]
it also contains links to labs tools and scene based on that talk