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-   -   2D Heat Transfer problem in Fluent 6.3 please help (http://www.cfd-online.com/Forums/fluent/48811-2d-heat-transfer-problem-fluent-6-3-please-help.html)

Damian July 18, 2008 17:48

2D Heat Transfer problem in Fluent 6.3 please help
 
Dear All,

I am modeling a simple 2D square cross-section having 1x1 mm copper is inside a 2x2 mm aluminum. The copper has an energy source term of 1000 W/m3. The outside surface of the aluminum is exposed to free convection, where the heat transfer coefficient, h, has a value of 100 W/m2K and the free-stream temperature is 300 K . The surface zone between the solids is a wall being coupled " material: copper. Fluent creates a shadow for this wall.

The solver is pressure based, 2D, implicit, steady-state; energy equation is set. The energy residuals have an absolute criterion of 1e-09.

When the case is run, the solution never converges; only to 1e-04. The temperature distribution is impractical. The temperature difference between minimum and maximum is 0.0025 K, where minimum temperature is 300K. It is almost uniform which does not make sense!

I would appreciate any help in achieving realistic results, meaning having the solution converge with reasonable temperature distribution.

Thank you in advance.

Regards,

Damian

Mahyar Mohammadian July 19, 2008 00:29

Re: 2D Heat Transfer problem in Fluent 6.3 please
 
you should set heat generation in the boundary contion of wall, with a amount of wall thickness for it, if the heat generation is not generated in the domain.

Damian July 19, 2008 04:42

Re: 2D Heat Transfer problem in Fluent 6.3 please
 
Thanks for the response. My geometry is supposed to have heat generation inside the domain not in the wall. Would setting a heat generation in the boundary condition of the wall be equal?

Rakesh Jha August 1, 2008 05:08

Re: 2D Heat Transfer problem in Fluent 6.3 please
 
It may be equal if you multiply the volumetric heat generation rate with the volume of your heat generating domain and then divide the outcome by the total surface area of the walls where you want to apply now. Afterall it is energy from copper going to aluminium, but then your copper domain will be useless in the model.

There may not be any significant temperature gradient within the heat generating copper domain because there is an uniform heat generation rate in it. It is like expecting a temperature gradient within a fired coal bed. Your aluminium domain must show some temperature gradient if the solution is converged.

j.suresh kumar August 11, 2008 08:48

Re: 2D Heat Transfer problem in Fluent 6.3 please
 
hi i want to know what is your continum whether it is water-liquid or air.........after that only i can get idea about your error


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