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-   -   ICEM: Uncovered faces (http://www.cfd-online.com/Forums/ansys-meshing/92682-icem-uncovered-faces.html)

user0314 September 21, 2011 17:06

ICEM: Uncovered faces
 
2 Attachment(s)
I am doing a 3D tet automatic mesh in ICEM. The geometry is a pi slice of a disk. At the scissor shaped intersection, I am getting 6 'uncovered faces' and I have included a zoomed out and a zoomed in picture of what I see.

I indicate 'Fix' during the mesh check and I assigned the 'uncovered faces' to a new part.

The uncovered face is the black outlined tetrahedral shape in the attached image.

How do I fix this problem? The uncovered faces are located at the outlet of my geometry.

When I import into fluent, I get 'segmentation fault', so wasn't sure if this was the cause.

Thanks.

PSYMN September 22, 2011 09:45

I can see from your second shot that there is a criss-crossing element there...

Uncovered just means that you have a volume element with at least one face that is not shared by either another volume element or capped by a shell element. It looks like perhaps it is two tetras that are sharing nodes with the adjacent pyramid, but not sharing faces...

It may be easiest to simply delete the bad elements and recreate them manually or with the Edit mesh repair option to fill voids with tetra...

I have no idea how you got to this point in the first place...

user0314 September 23, 2011 10:44

Edit Mesh Repair
 
After deleting offending elements, which tab under Edit Mesh Repair will fill voids with tetra?

I tried Find/Close holes option and selected the entire mesh, but that failed.

Thanks.

user0314 September 23, 2011 10:45

After deleting offending elements, which tab under Edit Mesh Repair will fill voids with tetra?

I tried Find/Close holes option and selected the entire mesh, but that failed.

Thanks.

PSYMN October 3, 2011 15:27

Yea, perhaps this could be improved... But for some reason the tetra option is only under "Remesh Elements" and not also under "Find/Close Holes in mesh"...

Another way to run it is just make sure that Mesh => Global Mesh Setup => Volume Meshing Parameters => Tetra/Mixed => (Quick) Delaunay has "fill holes in volume mesh" turned on.

Then go to "mesh => Compute Mesh => Tetra Mixed => Quick (Delaunay) and apply. It will find and mesh only the holes without trying to re-mesh everything.


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