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Old   August 11, 2010, 03:01
Default operating pressure
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Hi everyone!
I want to model laminar flow and heat transfer in a curved duct using Fluent. The B.Cs are: velocity inlet,4walls and outflow.Air has been selected as working fluid and the density changes based on incompressible ideal gas law which is an option for density in free convection problems and choosing operating pressure is very important in this formulation. Fluent offers that mean flow pressure should be used for operating pressure. But I don not know what is the mean flow pressure meaning and its value.
Thanks for your help

Last edited by hosen; August 11, 2010 at 03:26.
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Old   August 11, 2010, 10:12
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operating pressure is generally 1atm for external flows(101385 Pa or something very close), which is free air pressure at static conditions. I think it depends on your air characteristics inside duct, I mean temperature can change the static pressure of air.
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Old   August 14, 2010, 01:55
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Thanks for your reply. Is there a relation between operating pressure and air properties? I use default properties.
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