CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > Software User Forums > OpenFOAM > OpenFOAM Running, Solving & CFD

solution singularity

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

Like Tree2Likes
  • 2 Post By hjasak

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   February 20, 2007, 19:28
Default Hi Could some one please t
  #1
litonx
Guest
 
Posts: n/a
Hi

Could some one please tell me, why I am getting following message while I simulate a 3D simple domain with simpleFoam solver. Is it due to the improper boundary condition definition?

BICCG: Solving for Ux: solution singularity
BICCG: Solving for Uy: solution singularity
BICCG: Solving for Uz: solution singularity
ICCG: Solving for p: solution singularity
time step continuity errors : sum local = nan, global = nan, cumulative = nan
BICCG: Solving for epsilon: solution singularity
BICCG: Solving for k: solution singularity

-Liton
  Reply With Quote

Old   February 21, 2007, 02:32
Default Yes: you have probably messed
  #2
Senior Member
 
Hrvoje Jasak
Join Date: Mar 2009
Location: London, England
Posts: 1,902
Rep Power: 33
hjasak will become famous soon enough
Yes: you have probably messed up the boundary conditions, e.g. specified both the pressure and velocity on the same patch. Other possibilities are things like using zero viscosity and central differencing on convection, not under-relaxing the equations or similar.

As a result, your solver is doing division by zero or a similar error. If you want to stop producing NaN-s or maybe even find out precisely how it fails, try:

setenv FOAM_SIGFPE 1

Hrv
Kummi and kcavatar like this.
__________________
Hrvoje Jasak
Providing commercial FOAM/OpenFOAM and CFD Consulting: http://wikki.co.uk
hjasak is offline   Reply With Quote

Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
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 Off
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
grid singularity cfd student Main CFD Forum 3 April 8, 2012 06:11
Rookiequestions error solution singularity etc ham OpenFOAM Running, Solving & CFD 3 June 1, 2006 03:47
Singularity on the axis Daniel Main CFD Forum 1 June 9, 2005 01:14
Singularity Jim Main CFD Forum 10 July 25, 2000 16:02
Goldstheins Singularity Philip Main CFD Forum 1 July 18, 2000 16:14


All times are GMT -4. The time now is 01:54.