Hey,

I am modeling fire in a single room by volumetric energy and mass sources. The room has a door. I extended the domain outside the room so I can compute better flow through the door. I set the boundary of the extended domain as pressure outlet. I am having reverse flow on this boundary which I think is causing convergence problem for me. So is that the nature of the flow or numerical error resulting from illness in settings?

Thank you, kam

Hi Kam,

I would consider two main factors, the gas expation due to the heat and the fact that O2 occupies less volume when binden to a carbon dioxide. Just then you could have reverse flow.

Miguel

Thanks miguel, For the first factor Ive tried with both constant and temperature dependant propeties and I had reverse flow with both. Considering the second one I dont now if Ive got you well but if you mean O2 is entrained into the domain so you want to say it is the nature of the case. Well I dont really know and I will still appreciate any conribution.

kam