[Vignesh Veeresparan]

Hello All,

I was trying to mesh 2D problem with SHM. It completed meshing without any errors.

Part of the of log is as below

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)  < 0.05        : 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 6142 out of 6304 faces (97.4302%). Removed extrusion at 0 faces.
Added 61719 out of 75648 cells (81.5871%).
Edge intersection testing:
    Number of edges             : 433214
    Number of edges to retest   : 0
    Number of intersected edges : 68004

patch   faces    layers   overall thickness
                          [m]       [%]
-----   -----    ------   ---       ---
airfoil 6304     9.79     0.00231   93.9

Layer mesh : cells:135640  faces:433214  points:162642
Cells per refinement level:
    0   2269
    1   1562
    2   33876
    3   6646
    4   91287
Writing mesh to time constant
Wrote mesh in = 15.83 s.
Layers added in = 15.83 s.
Checking final mesh ...
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)  < 0.05        : 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
Finished meshing without any errors
Finished meshing in = 56.23 s.
End

Then I tried to check mesh quality using checkMesh and got the following report

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)  < 0.05        : 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 6142 out of 6304 faces (97.4302%). Removed extrusion at 0 faces.
Added 61719 out of 75648 cells (81.5871%).
Edge intersection testing:
    Number of edges             : 433214
    Number of edges to retest   : 0
    Number of intersected edges : 68004

patch   faces    layers   overall thickness
                          [m]       [%]
-----   -----    ------   ---       ---
airfoil 6304     9.79     0.00231   93.9

Layer mesh : cells:135640  faces:433214  points:162642
Cells per refinement level:
    0   2269
    1   1562
    2   33876
    3   6646
    4   91287
Writing mesh to time constant
Wrote mesh in = 15.83 s.
Layers added in = 15.83 s.
Checking final mesh ...
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)  < 0.05        : 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
Finished meshing without any errors
Finished meshing in = 56.23 s.
End

Could anyone help me in fixing this issue.

[Vignesh Veeresparan]

Hello All,

Found where I was wrong. I missed blockMeshDict definition of patches at front and back walls. Now, its working like a charm.

Additional tip on SHM, make sure there are no empty patches defined and created for 2D/3D problem. As it leads to check mesh failure.