CFD Online Logo CFD Online URL
Home > Forums > FLUENT

heat transfer imbalance? URGENT

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

LinkBack Thread Tools Display Modes
Old   July 29, 2005, 11:37
Default heat transfer imbalance? URGENT
Posts: n/a
Hi, I need help with this problem: A box with an inlet and outlet and a heat source, ke model. I get quite big heat transfer imbalance (report/fluxes/heat transfer imbalance) but all the residuals are less than 1E-06 and in particular the energy residual is less than 2E-08. All the residuals are flat and doesn´t change at all after further thousands of iterations. Is there anybody who knows what is going on with the energy imbalance???? Thanks in advance!
  Reply With Quote

Old   August 3, 2005, 13:59
Default Re: heat transfer imbalance? URGENT
James Willie
Posts: n/a

Try and play around with the Cp values. If they are constant,change them to piecewise polynomial and see what happens. Also, check to make sure that your mass balance is satisfied.


  Reply With Quote

Old   August 4, 2005, 01:35
Default Re: heat transfer imbalance? URGENT
Posts: n/a
Your temperature residual may be high.Try to converge upto 1e-12.

Can I get the exact numbers.
  Reply With Quote

Old   August 4, 2005, 08:22
Default Re: heat transfer imbalance? URGENT
Posts: n/a
Thanks! You were right. I need to get the residuals to less than 1E-12. And the way to get it is to run the simulation with double precision!
  Reply With Quote


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 HMR CFX 5 October 10, 2016 05:57
Water subcooled boiling Attesz CFX 7 January 5, 2013 04:32
Convective / Conductive Heat Transfer in Hypersonic flows enigma Main CFD Forum 2 November 1, 2009 23:53
How can I increase Heat Transfer at Domain Interf? B.Simon CFX 3 October 28, 2008 19:53
Convective Heat Transfer - Heat Exchanger Mark CFX 6 November 15, 2004 16:55

All times are GMT -4. The time now is 16:00.