[Frank_uk]

Hello all,

I am working on an ~18M cell case (external aero) and I am facing a crash problem during the mesh snappying.

I am working in parallel, using 12 cores.

It looks like a divide by zero case, but I cannot figure out what might be wrong. Changing a bit the ref levels in the control file sometimes helps to overcome it, but I cannot spot the root of the problem.

My current snapControls:

snapControls
{
nSmoothPatch 5;
tolerance 2.0;
nSolveIter 150;
nRelaxIter 10;
nFeatureSnapIter 10;
implicitFeatureSnap false;
explicitFeatureSnap true;
multiRegionFeatureSnap false;
}

Below an excerpt of the log.

I thank you in advance for your help.

Regards,

Frank
--

Moving mesh ...

Iteration 0
Moving mesh using displacement scaling : min:1 max:1
Checking faces in error :
non-orthogonality > 65 degrees : 1454
faces with face pyramid volume < 1e-13 : 3972
faces with face-decomposition tet quality < 1e-15 : 16105
faces with concavity > 80 degrees : 190

...skipping one line
faces with interpolation weights (0..1) < 0.02 : 33
faces with volume ratio of neighbour cells < 0.01 : 197
faces with face twist < 0.02 : 1250
faces on cells with determinant < 0.001 : 124

Iteration 1
Moving mesh using displacement scaling : min:0.75 max:1
[8] #0 Foam::error:rintStack(Foam::Ostream&) at ??:?
[8] #1 Foam::sigFpe::sigHandler(int) at ??:?
[8] #2 in "/lib/x86_64-linux-gnu/libc.so.6"
[8] #3 Foam::face::centre(Foam::Field<Foam::Vector<double > > const&) const at ??:?
[8] #4 Foam::face::sweptVol(Foam::Field<Foam::Vector<doub le> > const&, Foam::Field<Foam::Vector<double> > const&) const at ??:?
[8] #5 Foam:rimitiveMesh::movePoints(Foam::Field<Foam:: Vector<double> > const&, Foam::Field<Foam::Vector<double> > const&) at ??:?
[8] #6 Foam:olyMesh::movePoints(Foam::Field<Foam::Vecto r<double> > const&) at ??:?
[8] #7 Foam::fvMesh::movePoints(Foam::Field<Foam::Vector< double> > const&) at ??:?
[8] #8 Foam::motionSmootherAlgo::scaleMesh(Foam::List<int >&, Foam::List<Foam::Pair<int> > const&, Foam::dictionary const&, Foam::dictionary con
st&, bool, int) at ??:?
[8] #9 Foam::motionSmootherAlgo::scaleMesh(Foam::List<int >&, Foam::List<Foam::Pair<int> > const&, bool, int) at ??:?
[8] #10 Foam::autoSnapDriver::scaleMesh(Foam::snapParamete rs const&, int, Foam::List<Foam::Pair<int> > const&, Foam::motionSmoother&) at ??:?
[8] #11 Foam::autoSnapDriver::doSnap(Foam::dictionary const&, Foam::dictionary const&, double, double, Foam::snapParameters const&) at ??:?
[8] #12
[8] at ??:?
[8] #13 __libc_start_main in "/lib/x86_64-linux-gnu/libc.so.6"
[8] #14
[8] at ??:?
[lorenz-WS:15462] *** Process received signal ***
[lorenz-WS:15462] Signal: Floating point exception (8)
[lorenz-WS:15462] Signal code: (-6)
[lorenz-WS:15462] Failing at address: 0x3e800003c66
[lorenz-WS:15462] [ 0] /lib/x86_64-linux-gnu/libc.so.6(+0x36d40) [0x7f1786effd40]
[lorenz-WS:15462] [ 1] /lib/x86_64-linux-gnu/libc.so.6(gsignal+0x39) [0x7f1786effcc9]
[lorenz-WS:15462] [ 2] /lib/x86_64-linux-gnu/libc.so.6(+0x36d40) [0x7f1786effd40]
[lorenz-WS:15462] [ 3] /opt/openfoam231/platforms/linux64GccDPOpt/lib/libOpenFOAM.so(_ZNK4Foam4face6centreERKNS_5FieldIN S_6VectorIdEEEE+0x14f) [
0x7f17880ccbcf]
[lorenz-WS:15462] [ 4] /opt/openfoam231/platforms/linux64GccDPOpt/lib/libOpenFOAM.so(_ZNK4Foam4face8sweptVolERKNS_5Field INS_6VectorIdEEEES6_+0x3
a) [0x7f17880cd2ca]
[lorenz-WS:15462] [ 5] /opt/openfoam231/platforms/linux64GccDPOpt/lib/libOpenFOAM.so(_ZN4Foam13primitiveMesh10movePoints ERKNS_5FieldINS_6VectorI
dEEEES6_+0xdd) [0x7f178817b39d]
[lorenz-WS:15462] [ 6] /opt/openfoam231/platforms/linux64GccDPOpt/lib/libOpenFOAM.so(_ZN4Foam8polyMesh10movePointsERKNS_ 5FieldINS_6VectorIdEEEE+
0x1f1) [0x7f178815acf1]
[lorenz-WS:15462] [ 7] /opt/openfoam231/platforms/linux64GccDPOpt/lib/libfiniteVolume.so(_ZN4Foam6fvMesh10movePointsERKN S_5FieldINS_6VectorIdEEE
E+0xbc) [0x7f178a52761c]
[lorenz-WS:15462] [ 8] /opt/openfoam231/platforms/linux64GccDPOpt/lib/libdynamicMesh.so(_ZN4Foam18motionSmootherAlgo9sca leMeshERNS_4ListIiEERKNS
1_INS_4PairIiEEEERKNS_10dictionaryESB_bi+0x1ff) [0x7f1788cbe9ff]
[lorenz-WS:15462] [ 9] /opt/openfoam231/platforms/linux64GccDPOpt/lib/libdynamicMesh.so(_ZN4Foam18motionSmootherAlgo9sca leMeshERNS_4ListIiEERKNS
1_INS_4PairIiEEEEbi+0x1b) [0x7f1788cbf69b]
[lorenz-WS:15462] [10] /opt/openfoam231/platforms/linux64GccDPOpt/lib/libautoMesh.so(_ZN4Foam14autoSnapDriver9scaleMeshE RKNS_14snapParametersEiR
KNS_4ListINS_4PairIiEEEERNS_14motionSmootherE+0x12 2) [0x7f178869c132]
[lorenz-WS:15462] [11] /opt/openfoam231/platforms/linux64GccDPOpt/lib/libautoMesh.so(_ZN4Foam14autoSnapDriver6doSnapERKN S_10dictionaryES3_ddRKNS
_14snapParametersE+0x1635) [0x7f178869da65]
[lorenz-WS:15462] [12] snappyHexMesh() [0x415eca]
[lorenz-WS:15462] [13] /lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf5) [0x7f1786eeaec5]
[lorenz-WS:15462] [14] snappyHexMesh() [0x41739d]
[lorenz-WS:15462] *** End of error message ***

[clktp]

Did you solve this problem, I have the same issu and I can't figure it out why it happens.