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[Commercial meshers] Convert a .msh file with infinitely thin walls

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Old   May 14, 2020, 06:14
Default Convert a .msh file with infinitely thin walls
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Andrea
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Hi all,

I have tried to re-create the mixerVessel2D mesh in ICEM CFD. In this mesh, both the impeller blades and the the baffles at the tank wall have zero thickness.

I have successfully imported this mesh in Fluent (which, as expected, creates shadow walls for these zero-thickness walls).

However, when I try to convert the .msh file using fluent3DMeshToFoam I get te following error:

The mesh file is attached.

Code:
Create time

Dimension of grid: 3
Number of points: 3360
PointGroup: 8 start: 0 end: 3359.  Reading points...done.
Number of cells: 1600
CellGroup: 9 start: 0 end: 1599 type: 1
Number of faces: 6544
FaceGroup: 10 start: 0 end: 3055.  Reading uniform faces...done.
FaceGroup: 11 start: 3056 end: 4655.  Reading uniform faces...done.
FaceGroup: 12 start: 4656 end: 6255.  Reading uniform faces...done.
FaceGroup: 13 start: 6256 end: 6379.  Reading uniform faces...done.
FaceGroup: 14 start: 6380 end: 6479.  Reading uniform faces...done.
Zone: 9 name: FLUID type: fluid.  Reading zone data...done.
Zone: 10 name: int_FLUID type: interior.  Reading zone data...done.
Zone: 11 name: TOP type: wall.  Reading zone data...done.
Zone: 12 name: BOTTOM type: wall.  Reading zone data...done.
Zone: 13 name: ROTOR type: wall.  Reading zone data...done.
Zone: 14 name: STATOR type: wall.  Reading zone data...done.

FINISHED LEXING

Creating patch 0 for zone: 11 name: TOP type: wall
Creating patch 1 for zone: 12 name: BOTTOM type: wall
Creating patch 2 for zone: 13 name: ROTOR type: wall
Creating patch 3 for zone: 14 name: STATOR type: wall
Creating cellZone 0 name: FLUID type: fluid
Creating faceZone 0 name: int_FLUID type: interior
faceZone from Fluent indices: 0 to: 3055 type: interior
patch 0 from Fluent indices: 3056 to: 4655 type: wall
patch 1 from Fluent indices: 4656 to: 6255 type: wall
patch 2 from Fluent indices: 6256 to: 6379 type: wall
patch 3 from Fluent indices: 6380 to: 6479 type: wall


--> FOAM FATAL ERROR:
Illegal cell label -1 in neighbour addressing for face 6524

    From function void Foam::polyMesh::initMesh()
    in file meshes/polyMesh/polyMeshInitMesh.C at line 64.

FOAM exiting
Any idea of what's going on here?

Thanks,
Andrea
Attached Files
File Type: zip 2dMixerVessel.zip (99.1 KB, 0 views)

Last edited by Andrea1984; May 14, 2020 at 06:16. Reason: forgot to upload the mesh file
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Old   May 20, 2020, 18:02
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HPE
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Hi,

Quote:
Illegal cell label -1 in neighbour addressing for face 6524
- `Cell` has to be 3-D in OF. So, I am not sure if zero-thickness entities can be converted to legitimate cells.
- Should the propeller patches act like a set of internal faces instead?
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Old   May 21, 2020, 03:47
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Can a set of internal faces be treated as a boundary (a wall in this specific case)?

Essentially, I am trying to replicate the mesh of the mixerVessel2D tutorial, where both the baffles and the impeller blades are zero-thickness wall.
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Old   May 31, 2020, 15:41
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>> Can a set of internal faces be treated as a boundary (a wall in this specific case)?

Afaik (actually I have seen one), you can do this. But I have never done it by myself, I'm afraid. So I am not able to provide a MWE from scratch. Or so some other kind person may hopefully give a hand to you. My apologies.

But if you can provide a draft MWE for a start, may be we can go from there.
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