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Old   September 25, 2008, 07:49
Default Hi Foamers, i am working on a
  #61
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Vishal Jambhekar
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Hi Foamers,
i am working on a sonicTurbfoam on prisem case for Supersonic flow conditions...... but the mesh provided with the prism example is exactly reverse. i tried to refine it a lot but bot able to set proper grading ration..... resulting in an error in blockMesh....due to mis match amongst faces.... can any one please tell me how to refine the grid near prism to get reduced Y+.....
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Old   November 10, 2008, 07:46
Default Hello, Creating field DpDt
  #62
emilianyassenov
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Hello,

Creating field DpDt

Courant Number mean: 0 max: 25.4

Starting time loop

Courant Number mean: 0 max: 25.4
Time = 0.01

diagonal: Solving for rho, Initial residual = 0, Final residual = 0, No Iterations 0
DILUPBiCG: Solving for Ux, Initial residual = 1, Final residual = 9.68187e-06, No Iterations 30
DILUPBiCG: Solving for Uy, Initial residual = 1, Final residual = 7.55278e-06, No Iterations 30
DILUPBiCG: Solving for Uz, Initial residual = 1, Final residual = 8.92605e-06, No Iterations 36
DILUPBiCG: Solving for h, Initial residual = 0.582762, Final residual = 8.10937e-06, No Iterations 32
DICPCG: Solving for p, Initial residual = 1, Final residual = 9.23182e-07, No Iterations 920
diagonal: Solving for rho, Initial residual = 0, Final residual = 0, No Iterations 0
time step continuity errors : sum local = 1.16199e-08, global = -4.76424e-12, cumulative = -4.76424e-12
DILUPBiCG: Solving for h, Initial residual = 1, Final residual = 8.3393e-06, No Iterations 88
DICPCG: Solving for p, Initial residual = 0.636047, Final residual = 9.56417e-07, No Iterations 917
diagonal: Solving for rho, Initial residual = 0, Final residual = 0, No Iterations 0
time step continuity errors : sum local = 4.08715e-08, global = -1.30096e-13, cumulative = -4.89434e-12
DILUPBiCG: Solving for omega, Initial residual = 0.228422, Final residual = 8.70597e-06, No Iterations 83
bounding omega, min: -1759.9 max: 1362.81 average: 697.513
DILUPBiCG: Solving for k, Initial residual = 1, Final residual = 7.36061e-06, No Iterations 48
ExecutionTime = 197.08 s ClockTime = 199 s


I hve run the case but it is very slow because of the courant number it is very high.

what can I do to increase it...
and make faster the time steps.

thank you in advance


Emo
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Old   November 11, 2008, 06:05
Default I have include transport equat
  #63
emilianyassenov
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I have include transport equation but again courant number is high.
can someone help me?
thanks

Emo
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Old   November 11, 2008, 06:44
Default Hi, The problem could come
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ep4
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Pattyn Eric
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Hi,

The problem could come form the turbulence model kOmegaSST. It seems that you have bounding errors: bounding omega, min: -1759.9 max: 1362.81 average: 697.513

Maybe you should choose more adapted initial values for omega and/or k.
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Old   June 22, 2010, 09:58
Default turboFoam problem
  #65
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asmi
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hello, i'm new with openfoam and i have a problem with a mpirun, when a type in the terminal : mpirun -np 30 -machinefile machinefile turbFoam -parallel | tee 2>&1 log/turb.log
it runs, after a while it stops with this message :
Create time
Create mesh for time = 4000
Reading field p
Reading field U
Reading/calculating face flux field phi
[23]
[23]
[23] keyword PISO is undefined in dictionary "/media/OpenFoam/Travaux/p-habitacle/foamProMesh-pisoFoam/turbtest/turbFoam/processor23/system/fvSolution"
[23]
[23] file: /media/OpenFoam/Travaux/p-habitacle/foamProMesh-pisoFoam/turbtest/turbFoam/processor23/system/fvSolution from line 3 to line 31.
[23]
[23] From function dictionary::subDict(const word& keyword) const
[23] in file db/dictionary/dictionary.C at line 271.
[23]
FOAM parallel run exiting
[23]
--------------------------------------------------------------------------
MPI_ABORT was invoked on rank 23 in communicator MPI_COMM_WORLD with errorcode 1.
NOTE: invoking MPI_ABORT causes Open MPI to kill all MPI processes.
You may or may not see output from other processes, depending on exactly when Open MPI kills them.

--------------------------------------------------------------------------
mpirun has exited due to process rank 23 with PID 30795 on node 10.0.0.7 exiting without calling "finalize". This may have caused other processes in the application to be terminated by signals sent by mpirun (as reported here).


but when i replace turbFoam in the mpirun with simpleFoam it runs correctly. Someone knows what is the problem?
thanks
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