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Old   November 4, 2012, 10:58
Default SnappyHexMesh issues
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Hi,
I'm a new user of SnappyHexMesh of OpenFoam for mesh.
I'm trying to test the capability of this tool and compare it with other software for meshing, so I tried to use very simple geometries like cube, cilinder...
I used first the blockMesh tool, then the snappyhexMesh tool and after that I have tested the grid with checkMesh and no problem was shown, but opening the grid with ParaFOAM I see same strange thing in the grid, if I do same sections view.
You can look it in the picture attached.
I have tried to change settings in my snappyHexMeshdict file but the problem doesn't stop.
Is it a visualization issues or a grid probrem?

I attacched also my blockMesh and snappyHexMeshDict file.
thanks
Attached Images
File Type: jpg mesh_1.jpg (96.9 KB, 58 views)
File Type: jpg mesh_2.jpg (97.7 KB, 53 views)
File Type: jpg mesh_3.png;.jpg (98.0 KB, 46 views)
Attached Files
File Type: txt blockMeshDict.txt (1.6 KB, 5 views)
File Type: txt snappyHexMeshDict.txt (9.9 KB, 6 views)
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Old   November 4, 2012, 15:55
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it is a visualization error typical of paraview.

your cells are not thetraedal but made of "bricks"
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Old   November 5, 2012, 06:08
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Thanks for the answer,
how can I fix this visualization problem?

And another question, when i try to convert the mesh from OF to fluent I obtain the messege below:

" FOAM Warning :
From function void fluentFvMesh::writeFluentMesh() const
in file fluentFvMesh.C at line 252
foamMeshToFluent: cell shape for cell 241613 only supported by Fluent polyhedral meshes.
Suppressing any further messages for polyhedral cells. "

but the mesh is genereted anyway, the suppression of the polyhedral cells can modify my results ?
How can I avoid having polyhedral cells in the mesh?
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Old   November 6, 2012, 09:27
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Quote:
Originally Posted by Alessio_1985 View Post
Thanks for the answer,
how can I fix this visualization problem?

And another question, when i try to convert the mesh from OF to fluent I obtain the messege below:

" FOAM Warning :
From function void fluentFvMesh::writeFluentMesh() const
in file fluentFvMesh.C at line 252
foamMeshToFluent: cell shape for cell 241613 only supported by Fluent polyhedral meshes.
Suppressing any further messages for polyhedral cells. "

but the mesh is genereted anyway, the suppression of the polyhedral cells can modify my results ?
How can I avoid having polyhedral cells in the mesh?
Older FLUENT versions did not support polyhedrals. Assuming your version of FLUENT does support polyhedrals, you can just ignore the warning.
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Old   November 6, 2012, 20:59
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Quote:
Originally Posted by Alessio_1985 View Post
Thanks for the answer,
how can I fix this visualization problem?


there was a thread about that, once upon a time, somewhere in the forum. but i'm afraid I don't remember where... i'm just used to it and don't notice anymore.

--edit: my google-fu is batter than i expected, here is the link, try to read the last two messages, Bruno, one of our most prolific forum members, tell you haw to do it! Visualization problem on ParaFoam

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Originally Posted by Alessio_1985 View Post
And another question, when i try to convert the mesh from OF to fluent I obtain the messege below:

-cut-
don't know, sorry
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