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

nuSgsWallFunction in parallel

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

Reply
 
LinkBack Thread Tools Display Modes
Old   October 8, 2009, 04:17
Default nuSgsWallFunction in parallel
  #1
Member
 
Markus Weinmann
Join Date: Mar 2009
Location: Stuttgart, Germany
Posts: 77
Rep Power: 9
cfdmarkus is on a distinguished road
Hi

I believe there is something wrong with nuSgsWallFunction in OF1.6 when used in parallel.

First, in the nuSgs file the boundary condition is set as:
cylinder{ type nuSgsWallFunction; value uniform 0; }

This setup works fine for a serial pisoFoam run!
If I run the same in parallel something is going wrong:

Courant Number mean: 0.01103945 max: 0.38140966
DILUPBiCG: Solving for Ux, Initial residual = 1, Final residual = 69.935898, No Iterations 1001
DILUPBiCG: Solving for Uy, Initial residual = 1, Final residual = 1616.3981, No Iterations 1001
DILUPBiCG: Solving for Uz, Initial residual = 1, Final residual = 15602.459, No Iterations 1001
DICPCG: Solving for p, Initial residual = 1, Final residual = 0.0098202015, No Iterations 354
time step continuity errors : sum local = 0.0001208599, global = -1.8938945e-18, cumulative = -1.8938945e-18
DICPCG: Solving for p, Initial residual = 0.98571483, Final residual = 0.074974329, No Iterations 1001
time step continuity errors : sum local = 0.061158378, global = 7.7675562e-13, cumulative = 7.7675373e-13
DILUPBiCG: Solving for k, Initial residual = 1, Final residual = 78.216523, No Iterations 1001
bounding k, min: -6.8958632e+13 max: 4.9482911e+14 average: 2.6886666e+09
ExecutionTime = 520.46 s ClockTime = 520 s



Note, when nuSgsWallFunction is replace by fixedValue, the problem in parallel mode disappears and all is well. I therefore believe that there is an issue with nuSgsWallFunction in parallel mode. I just don't know what is going wrong.

Best regards
Markus
cfdmarkus is offline   Reply With Quote

Old   October 8, 2009, 10:09
Default
  #2
Member
 
Markus Weinmann
Join Date: Mar 2009
Location: Stuttgart, Germany
Posts: 77
Rep Power: 9
cfdmarkus is on a distinguished road
I just found out that it does work under OF-1.6.x.
cfdmarkus 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
Script to Run Parallel Jobs in Rocks Cluster asaha OpenFOAM Running, Solving & CFD 12 July 4, 2012 22:51
HP MPI warning...Distributed parallel processing Peter CFX 10 May 14, 2011 06:17
IcoFoam parallel woes msrinath80 OpenFOAM Running, Solving & CFD 9 July 22, 2007 02:58
About parallel processing in Linux tuks CFX 10 August 8, 2005 08:22
Parallel Computing Classes at San Diego Supercomputer Center Jan. 20-22 Amitava Majumdar Main CFD Forum 0 January 5, 1999 13:00


All times are GMT -4. The time now is 02:43.