You can see setting a pyro solver in the project, the dynamics of fire depends on many parameters, the cooling rate, fuel parameters, temperature, etc.
This project is made for fast, to show how to use the gas repeat solver, for the non standart way. Namely, that with it you can retime the action of a large system such as pyro solver.
RBD has been pushed by to use "feedback scale" parameters in pyro solver. This is not the best way, but it is easiest to make an example.