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pimpleDyMFoam error message

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Old   September 27, 2013, 02:07
Default pimpleDyMFoam error message
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Laurent B
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Hi all,

I want to simulate a mixer (rushton turbine) and I m using pimpleDyMFoam solver but after some iterations i've got an error message. Can you help me understand why ?

Thanks
------------
Courant Number mean: 0.000809178 max: 0.483624
deltaT = 8.08409e-05
Time = 0.0321407

solidBodyMotionFunctions::rampedAxisRotationMotion ::transformation(): Time = 0.0321407 transformation: ((0 0 0) (0.99999 (0 0 0.00450739)))
AMI: Creating addressing and weights between 25130 source faces and 25130 target faces
AMI: Patch source weights min/max/average = 1.0565e-06, 1.00177, 0.834999
AMI: Patch target weights min/max/average = 0, 1.00183, 0.83511
PIMPLE: iteration 1
[2] #0 Foam::error:rintStack(Foam::Ostream&) in "/opt/openfoam220/platforms/linux64GccDPOpt/lib/libOpenFOAM.so"
[2] #1 Foam::sigFpe::sigHandler(int) in "/opt/openfoam220/platforms/linux64GccDPOpt/lib/libOpenFOAM.so"
[2] #2 in "/lib/x86_64-linux-gnu/libc.so.6"
[2] #3 Foam::divide(Foam::Field<double>&, double const&, Foam::UList<double> const&) in "/opt/openfoam220/platforms/linux64GccDPOpt/lib/libOpenFOAM.so"
[2] #4 Foam::tmp<Foam::GeometricField<double, Foam::fvPatchField, Foam::volMesh> > Foam:perator/<Foam::fvPatchField, Foam::volMesh>(Foam::dimensioned<double> const&, Foam::tmp<Foam::GeometricField<double, Foam::fvPatchField, Foam::volMesh> > const&) in "/opt/openfoam220/platforms/linux64GccDPOpt/bin/pimpleDyMFoam"
[2] #5
[2] in "/opt/openfoam220/platforms/linux64GccDPOpt/bin/pimpleDyMFoam"
[2] #6 __libc_start_main in "/lib/x86_64-linux-gnu/libc.so.6"
[2] #7
[2] in "/opt/openfoam220/platforms/linux64GccDPOpt/bin/pimpleDyMFoam"
[laurent-Precision-WorkStation-T7400:17917] *** Process received signal ***
[laurent-Precision-WorkStation-T7400:17917] Signal: Floating point exception (8)
[laurent-Precision-WorkStation-T7400:17917] Signal code: (-6)
[laurent-Precision-WorkStation-T7400:17917] Failing at address: 0x3e8000045fd
[laurent-Precision-WorkStation-T7400:17917] [ 0] /lib/x86_64-linux-gnu/libc.so.6(+0x364a0) [0x7f92ee10b4a0]
[laurent-Precision-WorkStation-T7400:17917] [ 1] /lib/x86_64-linux-gnu/libc.so.6(gsignal+0x35) [0x7f92ee10b425]
[laurent-Precision-WorkStation-T7400:17917] [ 2] /lib/x86_64-linux-gnu/libc.so.6(+0x364a0) [0x7f92ee10b4a0]
[laurent-Precision-WorkStation-T7400:17917] [ 3] /opt/openfoam220/platforms/linux64GccDPOpt/lib/libOpenFOAM.so(_ZN4Foam6divideERNS_5FieldIdEERKdRK NS_5UListIdEE+0x24) [0x7f92ef33a034]
[laurent-Precision-WorkStation-T7400:17917] [ 4] pimpleDyMFoam(_ZN4FoamdvINS_12fvPatchFieldENS_7vol MeshEEENS_3tmpINS_14GeometricFieldIdT_T0_EEEERKNS_ 11dimensionedIdEERKS8_+0x2a0) [0x4480a0]
[laurent-Precision-WorkStation-T7400:17917] [ 5] pimpleDyMFoam() [0x41aa93]
[laurent-Precision-WorkStation-T7400:17917] [ 6] /lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xed) [0x7f92ee0f676d]
[laurent-Precision-WorkStation-T7400:17917] [ 7] pimpleDyMFoam() [0x41eebd]
[laurent-Precision-WorkStation-T7400:17917] *** End of error message ***
--------------------------------------------------------------------------
mpirun noticed that process rank 2 with PID 17917 on node laurent-Precision-WorkStation-T7400 exited on signal 8 (Floating point exception).
--------------------------------------------------------------------------
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Old   October 18, 2013, 05:48
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Take a look at the fragments highlighted in red:

Quote:
Originally Posted by laurentb View Post
Hi all,

AMI: Creating addressing and weights between 25130 source faces and 25130 target faces
AMI: Patch source weights min/max/average = 1.0565e-06, 1.00177, 0.834999
AMI: Patch target weights min/max/average = 0, 1.00183, 0.83511

mpirun noticed that process rank 2 with PID 17917 on node laurent-Precision-WorkStation-T7400 exited on signal 8 (Floating point exception).
Your sliding mesh explodes due to incorrect weighting (there is at least one face with zero weighting which is unphysical). There have been many posts on this forum giving guidance on how to get rid of that. In short, you should aim at having all your AMI weightings as close to 1.0 as possible.

Have a look at these to start with:

Problem using AMI

pimpleDyMfoam simulation keeps blowing up

Without seeing your case I'd recommend increasing the number of feature snap iterations and solver iterations in your snap controlls. Sometimes coarsening the mesh and increasing the AMI tolerance also helps.

Best wishes,

A
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Old   October 22, 2013, 08:12
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If you want to have a look to my case (200 Mo) you can download it at :

https://www.dropbox.com/s/allf2zv7v1...L131003.tar.gz

I'm working on an hexaedral mesh in order to avoid zero wheighting. Does someone can explain exactly what are "patch source and target weights" ?
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