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Different types of modeling fire and fire propagation

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n_moniri:
Dear all,
I have confusion about different possible ways for modeling fire.
As I understand, we can have a fire with a burner surface and an ignitor.
what is the difference between these two options?
Thanks

Dave McGill:
A burner can be a vent, or the face of an obstruction. It ejects fuel. With the default simple chemistry mixing model, if the fuel mixes with oxygen in the correct proportions, then combustion will occur. This is modelled on a cell-by-cell basis. No ignition source is required.

It is possible to specify an ignition temperature for a fuel or an initialization region. In those cases, a source of heat to ignite the fuel/oxygen mixture is required. That can be supplied by an ignitor, which is essentially a hot particle, placed above the source of fuel.

n_moniri:
Hello Dave,
Thank you so much for your great and quick response.

I also have another confusion about the propagation of fire. I'm modeling a room with a wooden box in front of a door that is supposed to be burnt away. Also, I defined all the required information like materials of all the components, reaction, surfaces, and mesh.  Although I can see the smoke and the fire on the box, after 120s simulation I still can not see the propagation of fire. I attached my Pyrosim file to this post.

I would be appreciated if you help in this regard.

Dave McGill:
Hi,

The most obvious issue is that your domain is a sealed box.

n_moniri:
Thanks Dave for your response.
By saying sealed box, you mean my model does not have any inside air flow?
If I want to address this issue I should put open vent on the wall or I should open the boundary?
When my model is imported from Revit through IFC extension to Pyrosim, does the software tool recognize that the meaning of the object? for example what is the wall or what is the door?
Thanks

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