Hi All,
I am running an inc
Hi All,
I am running an incompressible transient case using icoFoam on 16 processors (Itanium 2, mpirun). The code stalls for a while (roughly 15 20 mins) when it gets to solving the pressure equations. GAMG: Solving for p, Initial residual = 0.0754381, Final residual = 0.00116701, No Iterations 2 time step continuity errors : sum local = 8.18748e17, global = 3.0093e18, cumulative = 1.55931e16 GAMG: Solving for p, Initial residual = 0.0136584, Final residual = 0.00132829, No Iterations 1 time step continuity errors : sum local = 9.01088e17, global = 2.14171e19, cumulative = 1.55717e16 Basically it takes less time to solve the same problem on one processor than in parallel.Can anyone help me with this? Let me know if you need further information regarding the case. Thanks in advance. Warm Regards, Senthil 
Choose other solver on the pre
Choose other solver on the pressure equation  this one obviously does not work.
Hrv 
Hi Hrv,
I tried all the oth
Hi Hrv,
I tried all the other available solvers for the pressure equation but have the same problem. The fastest is with GAMG on four processors. Any suggestions or thoughts? Regards, Senthil 
Even better: a paper with some
Even better: a paper with some results:
CGAMG paper You can get one of the test cases Droplet splash test case and all the solvers are checked into the SVN version. Why don't you try to reporoduce the results from the paper and tell me what you see. Please let me know, Hrv 
Hi Hrv,
I have emailed you
Hi Hrv,
I have emailed you the results of the droplet splash test on our Altix Itanium machine for 1,2 and 4 processors. Sorry, it was an excel sheet and I did not know how to upload the file on to the forum. Regards, Senthil 
http://www.cfdonline.com/cgi

Hi Hrv,
Here is the attachm
Hi Hrv,
Here is the attachment. http://www.cfdonline.com/OpenFOAM_D...s/mime_txt.gif Droplet_splash.txt Warm Regards, Senthil JD: Thanks for the link 
Hello,
I would like to ask
Hello,
I would like to ask a question about parallel: when I do mpirun hostfile <machines> np <nprocs> .., what is the correspondence of <machines> file entries and processor numbers? Thanks! K. 
Running the case droppletSpals
Running the case droppletSpalsh directly, strictly following README guidance I also get this error:
> FOAM FATAL IO ERROR : Unknown symmetric matrix solver CG Valid symmetric matrix solvers are : 4 ( ICCG smoothSolver PCG GAMG ) file: /home/flurec/commun/vk/0803/27dropletSplash/./system/fvSolution::pcorr a t line 27. From function lduMatrix::solver::New in file matrices/lduMatrix/lduMatrix/lduMatrixSolver.C at line 78. What is going on ? 
> FOAM FATAL IO ERROR : Unkn
Quote:
Dragos 
Try this:
 go to OpenFOAM
Try this:
 go to OpenFOAM1.4.1dev/src and tell me if there is a library called lduSolvers. If so, do wmake libso lduSolvers and make sure the library is compiled.  go to OpenFOAM1.4.1dev/applications/solvers/multiphase/interFoam and look at the file Make/options. It should contain a line under EXE_LIBS saying llduSolvers if so, type wmake and make sure the executable is built.  if you are not running OpenFOAM1.4.1dev, you will fail somewhere along the way. If you want to have a go with the legacy solvers, go to the test case and look for the file dropletSplash/fvSolution.oldSolvers and use that for system/fvSolution Hope this helps, Hrv 
I was using the released versi
I was using the released version (and currently checking out the svn...). Sorry for the noise, and thanks for your comments.

Thank you Hrvoje.
After my
Thank you Hrvoje.
After my dev version of svn worked, I had to add the lldusolver to a customized solver. I would'nt have find hit quickly without your post. 
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