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skewFaces Errors after snappyHexMesh

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Old   January 18, 2017, 09:14
Default skewFaces Errors after snappyHexMesh
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Hey guys,
I have included a .stl-File and want to create a mash. So I used surfaceFeatureExtract, BlockMesh and snappyHexMesh. When I tryed "checkMesh", the answer was:

Create time

Create polyMesh for time = 0

Time = 0

Mesh stats
points: 3585719
faces: 10022446
internal faces: 9352200
cells: 3221166
faces per cell: 6.01479
boundary patches: 7
point zones: 0
face zones: 0
cell zones: 0

Overall number of cells of each type:
hexahedra: 2987288
prisms: 161904
wedges: 0
pyramids: 0
tet wedges: 0
tetrahedra: 0
polyhedra: 71974
Breakdown of polyhedra by number of faces:
faces number of cells
5 464
6 3624
9 65770
12 2112
15 4

Checking topology...
Boundary definition OK.
Cell to face addressing OK.
Point usage OK.
Upper triangular ordering OK.
Face vertices OK.
Number of regions: 1 (OK).

Checking patch topology for multiply connected surfaces...
Patch Faces Points Surface topology
inlet 1040 1134 ok (non-closed singly connected)
outlet 1040 1134 ok (non-closed singly connected)
front 23600 23976 ok (non-closed singly connected)
back 23600 23976 ok (non-closed singly connected)
bottom 3835 4144 ok (non-closed singly connected)
atmosphere 3835 4144 ok (non-closed singly connected)
Kanal 613296 613514 ok (closed singly connected)

Checking geometry...
Overall domain bounding box (-16 -0.5 -9.5) (43 2.2 6.5)
Mesh (non-empty, non-wedge) directions (1 1 1)
Mesh (non-empty) directions (1 1 1)
Boundary openness (-1.16337e-19 -3.50034e-14 4.62428e-15) OK.
Max cell openness = 5.91374e-16 OK.
Max aspect ratio = 5.79441 OK.
Minimum face area = 7.73338e-05. Maximum face area = 0.0435317. Face area magnitudes OK.
Min volume = 3.26601e-05. Max volume = 0.00872124. Total volume = 2543.98. Cell volumes OK.
Mesh non-orthogonality Max: 56.7907 average: 8.29633
Non-orthogonality check OK.
Face pyramids OK.
***Max skewness = 7.71711, 16 highly skew faces detected which may impair the quality of the results
<<Writing 16 skew faces to set skewFaces
Coupled point location match (average 0) OK.

Failed 1 mesh checks.


Do you have any idea what to do? I've tried foamToVTK to show me the problems in paraView, but it seems that my whole stl-Geometry is the problem...
Thank you!
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Old   January 19, 2017, 06:21
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I state I'm a beginner too, so I can't answer with a solution.

But because I want to learn, and maybe this will be useful to also who can help you too, I'd want to know how did you create the stl file, what are your snappyHexMeshDict and the blockMeshDict files.

Last edited by enginpower; January 19, 2017 at 06:23. Reason: grammar checks
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mesh 3d, shm, skewfaces

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