CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > CFX

Variable Thermal Contact Resistance

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

Reply
 
LinkBack Thread Tools Display Modes
Old   March 9, 2011, 07:47
Default Variable Thermal Contact Resistance
  #1
New Member
 
Join Date: Oct 2010
Posts: 14
Rep Power: 6
octavyo is on a distinguished road
Hello CFX Users,

I am modelling heat transfer in slip regime. In order to model temperature jump boundary condition, I defined thermal contact resistance between solid domain and fluid domain (at the interface). However, thermal contact resistance is a function of pressure of the fluid domain. I tried to use variable "Absolute Pressure" in the expression but CFX does not recognize it at the solid fluid interface.

Does someone have an idea about using the variable of one domain to the expression of another domain or interface?

Kind Regards,
Volkan
octavyo is offline   Reply With Quote

Old   March 9, 2011, 17:21
Default
  #2
Senior Member
 
Join Date: Mar 2009
Location: Europe
Posts: 168
Rep Power: 8
joey2007 is on a distinguished road
What is the error message and when did appear? Depending on that it can be decided if its possible to overwrite some rules.
__________________
-
-
-
-
-
------------------------------------------------------------------------
Please do not forget: I am not paid for answering your questions.


Thousands of issues can cause a division by zero. Please do not capture a thread, with the argument: "I have the same issue ...."
joey2007 is offline   Reply With Quote

Old   March 9, 2011, 18:00
Default
  #3
New Member
 
Join Date: Oct 2010
Posts: 14
Rep Power: 6
octavyo is on a distinguished road
Thanks for reply joey2007. CFX solver gives the following error:

+--------------------------------------------------------------------+
| ERROR #001100279 has occurred in subroutine ErrAction. |
| Message: |
| NAME_MOD: Error finding variable "PRES" |
+--------------------------------------------------------------------+

CFX is not able to find the pressure variable at solid-fluid interface. Pressure variable is only defined for fluid domain, then CFX does not allow me to use a variable of fluid domain at the interface.

Kind Regards,
Volkan
octavyo is offline   Reply With Quote

Old   March 13, 2011, 12:11
Default
  #4
Senior Member
 
Join Date: Mar 2009
Location: Europe
Posts: 168
Rep Power: 8
joey2007 is on a distinguished road
Guess your the thermal resistance is calculated on the solid side by the solver. I do not have recipe for that. Just some ideas:
  • User fortran with use of internal solver calls. This is not possible without intense support from ANSYS.
  • Structural FSI requires also pressure on solid side. May be there is way to make use of it.
I would call the support.
__________________
-
-
-
-
-
------------------------------------------------------------------------
Please do not forget: I am not paid for answering your questions.


Thousands of issues can cause a division by zero. Please do not capture a thread, with the argument: "I have the same issue ...."
joey2007 is offline   Reply With Quote

Reply

Thread Tools
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 On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
handle thin material or thermal contact resistance sven82 OpenFOAM 3 February 21, 2011 08:43
error in COMSOL:'ERROR:6164 Duplicate Variable' bhushas Main CFD Forum 1 May 30, 2008 04:35
Thermal contact resistance without meshing it? rosco FLUENT 2 June 30, 2003 17:50
Replace periodic by inlet-outlet pair lego CFX 3 November 5, 2002 21:09
Info: Short Course On Thermal Design of Electronic Equipment Arnold Free Main CFD Forum 0 August 10, 1999 10:18


All times are GMT -4. The time now is 06:31.