[geth03]

hi,

i encounter following problem when i try to create NCC with OF V12:

i mesh a simple impeller with tank,
by following the simple steps after snappyHexMesh (createBaffles, splitBaffles, renumberMesh, createNonConformalCouples) i can create NCC aka sliding mesh for the case without inflation layer.

Checking topology...
    Boundary definition OK.
    Cell to face addressing OK.
    Point usage OK.
    Upper triangular ordering OK.
    Face vertices OK.
   *Number of regions: 2
    The mesh has multiple regions which are not connected by any face.

Checking basic patch addressing...
                   Patch    Faces   Points
               symmetrys     9024     9348
                   walls    51344    51891
                   shaft     1707     1855
                impeller    35908    36586
              nonCouple1    34144    34712
              nonCouple2    34144    34712
    nonConformalCyclic_on_nonCouple1        0        0
    nonConformalCyclic_on_nonCouple2        0        0
    nonConformalError_on_nonCouple1        0        0
    nonConformalError_on_nonCouple2        0        0

Checking geometry...
    Overall domain bounding box (-134.993 -134.993 -0.00379469) (134.993 134.993 270.004)
    Mesh has 3 geometric (non-empty/wedge) directions (1 1 1)
    Mesh has 3 solution (non-empty) directions (1 1 1)
    Max cell openness = 3.19854e-16 OK.
    Max aspect ratio = 5.40902 OK.
    Minimum face area = 0.0577291. Maximum face area = 29.4731.  Face area magnitudes OK.
    Min volume = 0.0330084. Max volume = 148.755.  Total volume = 1.53276e+07.  Cell volumes OK.
    Mesh non-orthogonality Max: 55.8002 average: 8.64056
    Non-orthogonality check OK.
    Face pyramids OK.
 ***Max skewness = 9.85961, 14 highly skew faces detected which may impair the quality of the results
    Coupled point location match (average 0) OK.

Failed 1 mesh checks.

End

however, when i create inflation layer around the impeller and shaft and repeat the exact same procedure, i can not produce 2 mesh regions:

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 basic patch addressing...
                   Patch    Faces   Points
               symmetrys     9044     9402
                   walls    51213    52022
                   shaft     1699     1870
                impeller    35703    36929
              nonCouple1    34144    35051
              nonCouple2    34144    35055
    nonConformalCyclic_on_nonCouple1        0        0
    nonConformalCyclic_on_nonCouple2        0        0
    nonConformalError_on_nonCouple1        0        0
    nonConformalError_on_nonCouple2        0        0

Checking geometry...
    Overall domain bounding box (-135.052 -135.022 -0.0518381) (135.052 135.022 270.004)
    Mesh has 3 geometric (non-empty/wedge) directions (1 1 1)
    Mesh has 3 solution (non-empty) directions (1 1 1)
    Max cell openness = 3.32611e-16 OK.
    Max aspect ratio = 13.4413 OK.
    Minimum face area = 0.00224045. Maximum face area = 29.4667.  Face area magnitudes OK.
    Min volume = 0.00219164. Max volume = 147.335.  Total volume = 1.53274e+07.  Cell volumes OK.
    Mesh non-orthogonality Max: 72.2623 average: 8.86389
   *Number of severely non-orthogonal (> 70 degrees) faces: 4.
    Non-orthogonality check OK.
    Face pyramids OK.
 ***Max skewness = 10.196, 14 highly skew faces detected which may impair the quality of the results
    Coupled point location match (average 0) OK.

Failed 1 mesh checks.

End

the simulation does not run in the second case, which is expected.

any help is appreciated.

[geth03]

Update:

https://bugs.openfoam.org/view.php?id=4244

I did file a bug report, the developers changed the code,
I did not test it.