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Gmsh to OpenFOAM importing (Mesh checks fail)

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Old   August 31, 2016, 00:53
Default Gmsh to OpenFOAM importing (Mesh checks fail)
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Viraj Belekar
Join Date: Jun 2016
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Hello everyone,

This is regarding the meshing for FSI blood flow and respiratory flow available on the Gmsh wiki page (https://geuz.org/trac/gmsh/wiki/FSIMesh). When I import the .msh file to OpenFOAM using GmshToFoam command and when I give 'checkMesh' command, I see that there is a lot of problem with the mesh and the mesh check fails. Following is the output after checkMesh command:

Create time

--> FOAM Warning :
From function checkMesh
in file db/Time/timeSelector.C at line 270
No time specified or available, selecting 'constant'
Create polyMesh for time = constant

Time = constant

Mesh stats
points: 97868
faces: 1112572
internal faces: 1089520
cells: 550523
faces per cell: 4
boundary patches: 3
point zones: 0
face zones: 0
cell zones: 3

Overall number of cells of each type:
hexahedra: 0
prisms: 0
wedges: 0
pyramids: 0
tet wedges: 0
tetrahedra: 550523
polyhedra: 0

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 1134 606 ok (non-closed singly connected)
outlet 696 370 ok (non-closed singly connected)
defaultFaces 21222 10668 ok (non-closed singly connected)

Checking geometry...
Overall domain bounding box (-19.0115 -26.3703 -15.5354) (36.6107 25.7011 44.4179)
Mesh has 3 geometric (non-empty/wedge) directions (1 1 1)
Mesh has 3 solution (non-empty) directions (1 1 1)
***Boundary openness (-1.40643e-06 7.81371e-06 -2.65182e-06) possible hole in boundary description.
***Open cells found, max cell openness: 1, number of open cells 65
<<Writing 65 non closed cells to set nonClosedCells
<<Writing 16 cells with high aspect ratio to set highAspectRatioCells
Minimum face area = 0.000134534. Maximum face area = 5.40315. Face area magnitudes OK.
***Zero or negative cell volume detected. Minimum negative volume: -1.01707e-05, Number of negative volume cells: 10
<<Writing 10 zero volume cells to set zeroVolumeCells
Mesh non-orthogonality Max: 132.899 average: 46.9741
*Number of severely non-orthogonal (> 70 degrees) faces: 246718.
***Number of non-orthogonality errors: 53.
<<Writing 246771 non-orthogonal faces to set nonOrthoFaces
***Error in face pyramids: 76 faces are incorrectly oriented.
<<Writing 74 faces with incorrect orientation to set wrongOrientedFaces
***Max skewness = 19.6728, 8 highly skew faces detected which may impair the quality of the results
<<Writing 8 skew faces to set skewFaces
Coupled point location match (average 0) OK.

Failed 6 mesh checks.

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