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

where i am wrong

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

Reply
 
LinkBack Thread Tools Display Modes
Old   June 5, 2007, 04:31
Default where i am wrong
  #1
star
Guest
 
Posts: n/a
Dear users,

I am facing a problem. I am solving a problem with prescribed heat flux BCs. The residuals of enthalpy have gone down to 1.0e-7 but in .INFO file total heat balance is shown as 1.0e4. I dont know what is the wrong. PLZ help.

  Reply With Quote

Old   June 7, 2007, 07:46
Default Re: where i am wrong
  #2
Anton Lyaskin
Guest
 
Posts: n/a
Total heat balance has nothing to do with the residuals. It's just a summary of heat fluxes coming in and out of the domain. If you have only positive (i.e. incoming) heat fluxes, then for sure heat balance will be nonzero, so nothing is wrong
  Reply With Quote

Old   June 8, 2007, 06:48
Default Re: where i am wrong
  #3
star
Guest
 
Posts: n/a
Thanks anton for replying.

i want to add here that in INfo file it is mentioned that value of hdiff should reduce to small no.for convergence. In my problem all + heat fluxes has been specified. DO you have any further comments to say.

bye

  Reply With Quote

Old   June 8, 2007, 06:55
Default Re: where i am wrong
  #4
star
Guest
 
Posts: n/a
ALso my understanding is that for steady state conditions, the incoming heat should balance the outgoing. So the differance of the two should ideally be zero.

  Reply With Quote

Old   June 8, 2007, 07:33
Default Re: where i am wrong
  #5
Anton Lyaskin
Guest
 
Posts: n/a
Can you tell more about your problem specification? And BTW how does the value you see in the .info file correlates with your boundary heat fluxes?
  Reply With Quote

Old   June 15, 2007, 02:41
Default Re: where i am wrong
  #6
matej
Guest
 
Posts: n/a
what version of star you're using? I remember I've read something about correcting error with fluxes computations in the info and erd file in 4.02 documentation.

is it possible to check the fluxes in star with lovely register play? I'd try that first to see if the info file is right.

matej

  Reply With Quote

Old   June 21, 2007, 04:20
Default Re: where i am wrong
  #7
star
Guest
 
Posts: n/a
I am using ver3.24
  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
anything wrong in this udf brusly FLUENT 0 November 26, 2007 07:02
what's wrong with my UDF??? lk zhu FLUENT 2 June 16, 2006 02:52
what's wrong with 3.2 F.K. CD-adapco 8 August 9, 2004 02:44
What's wrong with my UDF? olivia FLUENT 1 June 23, 2001 17:06
wrong y+ jurek Main CFD Forum 1 August 26, 2000 21:01


All times are GMT -4. The time now is 07:12.