CFD Online Discussion Forums - [snappyHexMesh] error with addLayers

error:

Code:

 Checking mesh with layer ...

Checking faces in error :

    non-orthogonality > 65  degrees                        : 0

    faces with face pyramid volume < 1e-13                 : 0

    faces with face-decomposition tet quality < 1e-15      : 0

    faces with concavity > 80  degrees                     : 0

    faces with skewness > 4   (internal) or 20  (boundary) : 0

    faces with interpolation weights (0..1)  < 0.02        : 0

    faces with volume ratio of neighbour cells < 0.01      : 0

    faces with face twist < 0.02                           : 0

    faces on cells with determinant < 0.001                : 0

Detected 0 illegal faces (concave, zero area or negative cell pyramid volume)

Extruding 0 out of 45120 faces (0%). Removed extrusion at 0 faces.

Added 0 out of 135360 cells (0%).

Writing 0 added cells to cellSet addedCells



[stack trace]

=============

#1  Foam::sigSegv::sigHandler(int) in /usr/lib/openfoam/openfoam2312/platforms/linux64GccDPInt32Opt/lib/libOpenFOAM.so

#2  ? in /lib/x86_64-linux-gnu/libc.so.6

#3  Foam::snappyLayerDriver::writeLayerSets(Foam::fvMesh const&, Foam::List<int> const&, Foam::Field<double> const&) const in /usr/lib/openfoam/openfoam2312/platforms/linux64GccDPInt32Opt/lib/libsnappyHexMesh.so

#4  Foam::snappyLayerDriver::writeLayerData(Foam::fvMesh const&, Foam::List<int> const&, Foam::List<int> const&, Foam::Field<double> const&, Foam::Field<double> const&) const in /usr/lib/openfoam/openfoam2312/platforms/linux64GccDPInt32Opt/lib/libsnappyHexMesh.so

#5  Foam::snappyLayerDriver::addLayers(Foam::layerParameters const&, Foam::dictionary const&, Foam::List<int> const&, int, Foam::decompositionMethod&, Foam::fvMeshDistribute&) in /usr/lib/openfoam/openfoam2312/platforms/linux64GccDPInt32Opt/lib/libsnappyHexMesh.so

#6  Foam::snappyLayerDriver::doLayers(Foam::dictionary const&, Foam::dictionary const&, Foam::layerParameters const&, Foam::meshRefinement::FaceMergeType, bool, Foam::decompositionMethod&, Foam::fvMeshDistribute&) in /usr/lib/openfoam/openfoam2312/platforms/linux64GccDPInt32Opt/lib/libsnappyHexMesh.so

#7  ? in /usr/lib/openfoam/openfoam2312/platforms/linux64GccDPInt32Opt/bin/snappyHexMesh

#8  ? in /lib/x86_64-linux-gnu/libc.so.6

#9  __libc_start_main in /lib/x86_64-linux-gnu/libc.so.6

#10  ? in /usr/lib/openfoam/openfoam2312/platforms/linux64GccDPInt32Opt/bin/snappyHexMesh

=============

Segmentation fault (core dumped)

SHMdict add layers

Code:

 addLayersControls

{

    // Are the thickness parameters below relative to the undistorted

    // size of the refined cell outside layer (true) or absolute sizes (false).

    relativeSizes true;



    // Per final patch (so not geometry!) the layer information

    layers

    {

        airfoil

        {

            nSurfaceLayers 3;

        }

    }



    // Expansion factor for layer mesh

    expansionRatio 1.1;



    // Wanted thickness of final added cell layer. If multiple layers

    // is the thickness of the layer furthest away from the wall.

    // Relative to undistorted size of cell outside layer.

    // See relativeSizes parameter.

    finalLayerThickness 0.3;



    // Minimum thickness of cell layer. If for any reason layer

    // cannot be above minThickness do not add layer.

    // Relative to undistorted size of cell outside layer.

    minThickness 0.05;



    // If points get not extruded do nGrow layers of connected faces that are

    // also not grown. This helps convergence of the layer addition process

    // close to features.

    // Note: changed(corrected) w.r.t 1.7.x! (didn't do anything in 1.7.x)

    nGrow 0;



    // Advanced settings



    // When not to extrude surface. 0 is flat surface, 90 is when two faces

    // are perpendicular

    featureAngle 180;



    // At non-patched sides allow mesh to slip if extrusion direction makes

    // angle larger than slipFeatureAngle.

    slipFeatureAngle 30;



    // Maximum number of snapping relaxation iterations. Should stop

    // before upon reaching a correct mesh.

    nRelaxIter 5;



    // Number of smoothing iterations of surface normals

    nSmoothSurfaceNormals 10;



    // Number of smoothing iterations of interior mesh movement direction

    nSmoothNormals 5;



    // Smooth layer thickness over surface patches

    nSmoothThickness 10;



    // Stop layer growth on highly warped cells

    maxFaceThicknessRatio 0.5;



    // Reduce layer growth where ratio thickness to medial

    // distance is large

    maxThicknessToMedialRatio 0.3;



    // Angle used to pick up medial axis points

    // Note: changed(corrected) w.r.t 1.7.x! 90 degrees corresponds to 130

    // in 1.7.x.

    minMedialAxisAngle 90;





    // Create buffer region for new layer terminations

    nBufferCellsNoExtrude 0;





    // Overall max number of layer addition iterations. The mesher will exit

    // if it reaches this number of iterations; possibly with an illegal

    // mesh.

    nLayerIter 50;

 }