[Scat]

I’d like to simulate a room fire with CFX. So that my combustible surface starts to burn, I decided to create a wall boundary with a source condition that has a mass flow of combustible gas. My mass flow begins when the wall boundary has a specific average temperature. For that, I use a known CEL function “areaAve(T)@...” .
Everything works. I have a combustion – so far so good.

But, if you have large surfaces, like a carpet, it isn’t realistic that the whole surface starts to outlet a combustible gas overall.

Therefore, my idea was to create a mass flow expression for every mesh cell on my boundary. That means, if one cell has a specific temperature the area-related mass flow starts for this cell. Unfortunately I found no kind of CEL function that allow me to access a mesh cell of my boundary and nothing in the documentation that help me to realize my idea.

Maybe you have a kind of idea to solve my problem. Thanks at all.