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-   -   Problem about Free Convection between double-Wall (http://www.cfd-online.com/Forums/fluent/42056-problem-about-free-convection-between-double-wall.html)

The`am August 19, 2006 01:00

Problem about Free Convection between double-Wall
 
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

charonly August 19, 2006 22:56

Re: Problem about Free Convection between double-W
 
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.


Evan Rosenbaum August 21, 2006 11:26

Re: Problem about Free Convection between double-W
 
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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