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Problem about Free Convection between double-Wall

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Old   August 19, 2006, 01:00
Default Problem about Free Convection between double-Wall
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Hi..all please help !! the detail of my model are 1. natual convection between the gap of double-wall 2. I set inlet openning as pressure inlet and set outlet openning as pressure outlet 3. double-wall are difference temperature.

I have problem about How to set material type (fluid is air) I try ideal gas, incompress-ideal gas, Boussinesq but not work then I would like to define density upon temperature. Do you have any suggestion ?

If I would like to define density as density=352.2057/(Temerature)

What should I do and Can I use polynomial ?

Thank you for advance help !


If you don't understand. i am sorry, about poor in English
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Old   August 19, 2006, 22:56
Default Re: Problem about Free Convection between double-W
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hi Why can't work when setting ideal gas, incompress-ideal gas, Boussinesq?you must make sure the operate condition have been setted. If you would like to define density as density=352.2057/(Temerature), can get the real curve . 2.use the piecewise polynomial approimation to instead of the inverse function. hope these can help you.

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Old   August 21, 2006, 11:26
Default Re: Problem about Free Convection between double-W
Evan Rosenbaum
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If you tried ideal gas, incompressible ideal gas and Bossinesq and none of them worked, I suspect you may have applied gravity in the wrong vector. Double check you gravity specification.
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