CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > Software User Forums > ANSYS > FLUENT

Heat flux and wall temperature divergence

Register Blogs Members List Search Today's Posts Mark Forums Read

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   March 4, 2013, 13:04
Default Heat flux and wall temperature divergence
  #1
Member
 
Mat
Join Date: Jan 2012
Posts: 60
Rep Power: 14
Mat_fr is on a distinguished road
Dear all,

I would like to simulate just a simple heat transfer from a wall to the fluid.
When I impose the wall temperature in the thermal BC, everything is going fine.
However, when I impose a surface heat flux (W/mē), the wall temperature is diverging, or is converging towards a very high T (non-physical) when I'm using limiters.
I suppose this is due to the fact that my fluid is stagnant. And numerically, the soft has trouble to handle it.

I already refined my mesh. It's better, but I still have non-physical wall temperature.

Does anybody has a solution or a suggestion ?

Thanks in advance !

Remark : I have a cooling wall in the domain with the opposite heat flux, in order to be at equilibrium.
Mat_fr is offline   Reply With Quote

Old   March 4, 2013, 13:17
Default
  #2
Member
 
Ardalan
Join Date: Jul 2012
Location: Atlanta, USA
Posts: 77
Rep Power: 13
Ardali is on a distinguished road
That's free convection?
Ardali is offline   Reply With Quote

Old   March 6, 2013, 09:58
Default
  #3
Member
 
Mat
Join Date: Jan 2012
Posts: 60
Rep Power: 14
Mat_fr is on a distinguished road
Dear Ardali,

Thanks for your answer, which maked me verify something !

As the fluid is stagnant, it is free convection, indeed. That is why, I enabled the boussinesq approximation.
However, I didn't capture any convection, and as I said, the temperature was diverging.
In fact, I realized that the thermal expansion coefficient was set to 0... I suppose this the cause of the error.
I believed naivly that the Fluent Database would provide me some meaningfull value.

Sorry for this simple problem.

Best,

Mat

Last edited by Mat_fr; March 6, 2013 at 10:57.
Mat_fr is offline   Reply With Quote

Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Natural convection in a closed domain STILL NEEDING help! Yr0gErG FLUENT 4 December 2, 2019 01:04
Radiation interface hinca CFX 15 January 26, 2014 18:11
An error has occurred in cfx5solve: volo87 CFX 5 June 14, 2013 18:44
Heat Flux at wall in a conjugate heat transfer problem Chander CFX 2 July 9, 2011 23:22
Multicomponent fluid Andrea CFX 2 October 11, 2004 06:12


All times are GMT -4. The time now is 01:51.