[Gmsh] Hole in the geometry after meshing

[Mattijs Janssens]

> Is it problem in salome or gmsh or openfoam ?
The OpenFOAM converter will try to find the surface triangle on the tets of 
the mesh. (so it can assign that face to the corresponding boundary 'patch'). 
The warnings you are seeing is if it cannot find any face on any tet that 
corresponds to the surface triangle. I am not aware of any problems in the 
converter.

Regards,

Mattijs

On Monday 15 June 2009 07:17, Vadivelan C wrote:
> Hi
>
> I created a geometry using salome (did surface mesh and exported in stl
> format). Then i imported to gmsh and seen the surface mesh which looks
> fine. I generated 3d mesh and converted into parafoam format. When i seen
> the sufrace in parafoam i found there was some holes. During 3d mesh
> generation in gmsh, i got a warning like
>
> Warning:  Polygon 1 has two identical verts in facet 14512.
> Warning:  Polygon 1 has two identical verts in facet 14612.
> Warning:  Polygon 1 has two identical verts in facet 15192.
> Warning:  Polygon 1 has two identical verts in facet 15212.
>
>
> Info    : Meshing volume 31 (Tetgen+Delaunay)
> Info    : 6653 points 6491 edges and 13298 faces in the final mesh
> Info    : 6653 points created -- Worst tet radius is 44.4765
> Info    : 6663 points created -- Worst tet radius is 10.9067
> Info    : 6683 points created -- Worst tet radius is 12.0333
>
>
> Simillarly i got some warnings while converting gmsh to openfoam format .
>
> --> FOAM Warning :
>     From function polyMesh::polyMesh(... construct from shapes...)
>     in file meshes/polyMesh/polyMeshFromShapeMesh.C at line 576
>     Found 13222 undefined faces in mesh; adding to default patch.
> Finding faces of patch 0
> --> FOAM Warning :
>     From function gmshToFoam
>     in file gmshToFoam.C at line 891
>     Could not match gmsh face 3(999 2356 535) to any of the interior or
> exterior faces that share the same 0th point
> --> FOAM Warning :
>     From function gmshToFoam
>     in file gmshToFoam.C at line 891
>     Could not match gmsh face 3(467 2356 1687) to any of the interior or
> exterior faces that share the same 0th point
> --> FOAM Warning : Not using gmsh face 3(2395 2095 1415) since zero vertex
> is not on boundary of polyMesh
> --> FOAM Warning :
>     From function gmshToFoam
>     in file gmshToFoam.C at line 891
>     Could not match gmsh face 3(2395 2095 1415) to any of the interior or
> exterior faces that share the same 0th point
> --> FOAM Warning : Not using gmsh face 3(2395 1562 2466) since zero vertex
> is not on boundary of polyMesh
> --> FOAM Warning :
>     From function gmshToFoam
>     in file gmshToFoam.C at line 891
>     Could not match gmsh face 3(2395 1562 2466) to any of the interior or
> exterior faces that share the same 0th point
>
>
> I have attached those files and snapshots of the geometry. I dont know from
> where these holes comes from.
>
>
> Thanks
>  - Ranjith

-- 

Mattijs Janssens

OpenCFD Ltd.
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Email: M.Janssens at OpenCFD.co.uk
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