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Andrea_85 September 24, 2012 09:03

nonManifoldPoints using snappyHexMesh
HI foamers,
i am using snappyHexMEsh to mesh a complex geometry. I am doing some test, varying the number of cells of the backgroud mesh, to see which discretization is better for my simulation. In same cases, when the meshing process is finished, checkMesh returns a nonManifoldPoints warning like the one below


Mesh stats
    points:          2554663
    faces:            6609516
    internal faces:  5603097
    cells:            2023593
    boundary patches: 7
    point zones:      0
    face zones:      0
    cell zones:      0

Overall number of cells of each type:
    hexahedra:    2008426
    prisms:        0
    wedges:        0
    pyramids:      0
    tet wedges:    0
    tetrahedra:    0
    polyhedra:    15167

Checking topology...
    Boundary definition 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                 
    left                23766    25072    ok (non-closed singly connected) 
    right              22929    24290    ok (non-closed singly connected) 
    top                5476    5625    ok (non-closed singly connected) 
    bottom              17704    18749    ok (non-closed singly connected) 
    front              22057    23326    ok (non-closed singly connected) 
    back                23799    25100    ok (non-closed singly connected) 
    square_CreatedbyGmsh890688  890541  multiply connected (shared edge) 
  <<Writing 10 conflicting points to set nonManifoldPoints

Checking geometry...
    Overall domain bounding box (0.001 0.001 0.001) (0.023 0.03 0.023)
    Mesh (non-empty, non-wedge) directions (1 1 1)
    Mesh (non-empty) directions (1 1 1)
    Boundary openness (9.0038e-14 6.34549e-14 3.07148e-15) OK.
    Max cell openness = 2.23352e-16 OK.
    Max aspect ratio = 1.00626 OK.
    Minumum face area = 2.2082e-08. Maximum face area = 8.88927e-08.  Face area magnitudes OK.
    Min volume = 3.29904e-12. Max volume = 2.64278e-11.  Total volume = 7.18693e-06.  Cell volumes OK.
    Mesh non-orthogonality Max: 25.3111 average: 3.25383
    Non-orthogonality check OK.
    Face pyramids OK.
    Max skewness = 0.333842 OK.

Is there a way to avoid or to fix this issue? Does OF complain about that during the simulation? (at the moment i have not tried yet to run a simulation)

I am using OF 2.1.0, but i have also tried 1.7.1 and got the same error.



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