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

Continuity problems

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

Reply
 
LinkBack Thread Tools Display Modes
Old   March 31, 2009, 07:02
Unhappy Continuity problems
  #1
Member
 
anonym
Join Date: Mar 2009
Posts: 65
Rep Power: 8
Laci is on a distinguished road
I have a convergence problem with the continuity. Everything has converged easily except this. I use segregated ske model. DPM also exists.
I checked the fluxes of materials and difference of in/out is 0.1% compare to the total flow.
The residual is 2.44*10^-2. Is it cause by this small difference
Laci is offline   Reply With Quote

Old   March 31, 2009, 07:29
Default
  #2
New Member
 
Join Date: Mar 2009
Posts: 18
Rep Power: 8
mbernard is on a distinguished road
hello
do have a real divergence on continuity, or you just think you have a problem because of the residual values?

To my mind, 10^-2 isn't so bad in free convection case for example...



do you plot some surfaces values during the computation? is the a stabilisation of these values?

Regards
mbernard is offline   Reply With Quote

Old   March 31, 2009, 08:35
Default
  #3
Member
 
anonym
Join Date: Mar 2009
Posts: 65
Rep Power: 8
Laci is on a distinguished road
Quote:
Originally Posted by mbernard View Post
hello
do have a real divergence on continuity, or you just think you have a problem because of the residual values?

To my mind, 10^-2 isn't so bad in free convection case for example...



do you plot some surfaces values during the computation? is the a stabilisation of these values?

Regards
Thank you very much for your answer.
The stabilization is good. I had some instability problem with epsilon but grid adaptation and lower urf solved it.
You are right, I also have free convection in my system, but not only free convection... Maybe it is caused by free convection.
The temperature surfaces show reasonably good results.
Laci 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
How to write k and epsilon before the abnormal end xiuying OpenFOAM Running, Solving & CFD 8 August 27, 2013 15:33
Convergence moving mesh lr103476 OpenFOAM Running, Solving & CFD 30 November 19, 2007 15:09
Transient simulation not converging skabilan OpenFOAM Running, Solving & CFD 12 September 17, 2007 17:48
IcoFoam parallel woes msrinath80 OpenFOAM Running, Solving & CFD 9 July 22, 2007 02:58
Could anybody help me see this error and give help liugx212 OpenFOAM Running, Solving & CFD 3 January 4, 2006 19:07


All times are GMT -4. The time now is 05:47.