# Problem about Free Convection between double-Wall

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 August 19, 2006, 01:00 Problem about Free Convection between double-Wall #1 The`am Guest   Posts: n/a 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 ! The`am If you don't understand. i am sorry, about poor in English

 August 19, 2006, 22:56 Re: Problem about Free Convection between double-W #2 charonly Guest   Posts: n/a 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), 1.you can get the real curve . 2.use the piecewise polynomial approimation to instead of the inverse function. hope these can help you.

 August 21, 2006, 11:26 Re: Problem about Free Convection between double-W #3 Evan Rosenbaum Guest   Posts: n/a 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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