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operating density in buoyancy driven flow

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Old   March 23, 2006, 17:21
Default operating density in buoyancy driven flow
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Marie-Anne
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This is a question on the use of the operating density. I have a buyoancy driven flow in an open chemney with heated walls. I always used the incompressible ideal gas density for the air and an operating density equal to the volume average of the density over the whole chemney. However, I just tried to unselect the operating density option and instead of going up, the major part of the flow goes down. The result is therefore very different. Could anyone please explain me which option I should choose ?

Thank you !

Marie-Anne

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Old   March 24, 2006, 10:48
Default Re: operating density in buoyancy driven flow
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Jim_Park
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Sounds as if you're using a commercial code. Which one?
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Old   March 24, 2006, 10:52
Default Re: operating density in buoyancy driven flow
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Marie-Anne
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Hi, I am using FLUENT6.2.16. But maybe it is the same in every commercial codes ?

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