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Old   July 28, 2006, 04:15
Default reverse flow
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kam
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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
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Old   July 31, 2006, 07:57
Default Re: reverse flow
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Miguel
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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
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Old   July 31, 2006, 09:14
Default Re: reverse flow
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kam
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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
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