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

Strange Imbalance CHT

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

Reply
 
LinkBack Thread Tools Display Modes
Old   May 25, 2016, 06:53
Default Strange Imbalance CHT
  #1
Member
 
Marcel Jay
Join Date: Jun 2014
Location: Berlin
Posts: 53
Rep Power: 4
marcel_jay is on a distinguished road
Hello Community,

I have encountered an imbalance in the heat transfer rate (q in Watts) which I cannot explain.

Following Problem, I have a solid body with a heatsource with 66W into it. There are two other solid bodies in contact as well as a fluid domain (air).
I measured the imbalance in CFD-Post via an expression:
Code:
areaAve(Wall Heat Flux)@Interface1_Side1*area()@Interface1_Side1+areaAve(Wall Heat Flux)@Interface2_Side1.....
. In a converged steady state simulation (plotted Temperatures are not changing anymore), the result should be 0 Watts, right? But it is: 32W.
Is it possible that CFX defines some faces as negative? Since the part of the solid in contact with the fluid has a positive value for q. When I substract that one face I get a result of about 1W, which can be a round off error. Strangely, also the heatsource defined as 66W is only about 64.8W in CFD Post.

Any Idea?

Cheers
marcel_jay 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
domain imbalance for enrgy equation happy CFX 14 September 6, 2012 01:54
Domain imbalance in CHT Studentdrak CFX 3 May 2, 2012 04:21
Domain Imbalance HMR CFX 3 March 6, 2011 21:10
CHT Problem - Domain Imbalance Parthipan CFX 5 September 11, 2007 10:13
CHT strange problem MatejK CFX 3 September 1, 2005 05:32


All times are GMT -4. The time now is 03:18.