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2D Heat Transfer problem in Fluent 6.3 please help

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Old   July 18, 2008, 17:48
Default 2D Heat Transfer problem in Fluent 6.3 please help
  #1
Damian
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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
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Old   July 19, 2008, 00:29
Default Re: 2D Heat Transfer problem in Fluent 6.3 please
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Mahyar Mohammadian
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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.
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Old   July 19, 2008, 04:42
Default Re: 2D Heat Transfer problem in Fluent 6.3 please
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Damian
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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?
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Old   August 1, 2008, 05:08
Default Re: 2D Heat Transfer problem in Fluent 6.3 please
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Rakesh Jha
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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.
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Old   August 11, 2008, 08:48
Default Re: 2D Heat Transfer problem in Fluent 6.3 please
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j.suresh kumar
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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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