Help conjugate heat transfer small enclosure

Héctor Lodoso · December 21, 2016, 04:31

Hi all,

I am dealing with a conjugate heat transfer problem for electronics cooling in a very small domain (compartment or enclosure) in FLUENT, with quite a complex geometry, and I am a little bit stagnated.

I have been fighting with the mesh for a long time, and I think all problems related with skewness and quality are already solved. Also interfaces are correct. Still, I am having troubles for convergence.

I suspect the problem is, as it is such a small domain, that a very high gradients for temperature and turbulence variables can be found at the outlet. However, I would like to avoid to extrude it farther out of the compartment...

My outlet is, in a first approuch, a pressure-outlet.

¿Any idea on how could I treat this situation?

I would appreciate very much any guess.

Thanks!

LuckyTran · December 21, 2016, 13:30

Size shouldn't be an issue.

Electronics cooling is generally laminar flows; large gradients and turbulent flows are extremely rare. Are you sure the problem is as tough as you make it seem?

Héctor Lodoso · January 12, 2017, 11:51

Quote:

Originally Posted by LuckyTran

Size shouldn't be an issue.

Electronics cooling is generally laminar flows; large gradients and turbulent flows are extremely rare. Are you sure the problem is as tough as you make it seem?

Thanks for the reply LuckyTran. Actually it wasnt the problem.

December 21, 2016, 04:31	Help conjugate heat transfer small enclosure	#1
Héctor Lodoso New Member Héctor Lodoso Join Date: Oct 2015 Location: Spain Posts: 15 Rep Power: 10	Hi all, I am dealing with a conjugate heat transfer problem for electronics cooling in a very small domain (compartment or enclosure) in FLUENT, with quite a complex geometry, and I am a little bit stagnated. I have been fighting with the mesh for a long time, and I think all problems related with skewness and quality are already solved. Also interfaces are correct. Still, I am having troubles for convergence. I suspect the problem is, as it is such a small domain, that a very high gradients for temperature and turbulence variables can be found at the outlet. However, I would like to avoid to extrude it farther out of the compartment... My outlet is, in a first approuch, a pressure-outlet. ¿Any idea on how could I treat this situation? I would appreciate very much any guess. Thanks! shlover119 likes this.

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December 21, 2016, 13:30		#2
LuckyTran Senior Member Lucky Join Date: Apr 2011 Location: Orlando, FL USA Posts: 5,665 Rep Power: 65	Size shouldn't be an issue. Electronics cooling is generally laminar flows; large gradients and turbulent flows are extremely rare. Are you sure the problem is as tough as you make it seem?