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-   -   SnappyHexMesh issues (http://www.cfd-online.com/Forums/openfoam/108900-snappyhexmesh-issues.html)

Alessio_1985 November 4, 2012 09:58

SnappyHexMesh issues
 
5 Attachment(s)
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

sail November 4, 2012 14:55

it is a visualization error typical of paraview.

your cells are not thetraedal but made of "bricks"

Alessio_1985 November 5, 2012 05:08

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?

olesen November 6, 2012 08:27

Quote:

Originally Posted by Alessio_1985 (Post 390276)
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.

sail November 6, 2012 19:59

Quote:

Originally Posted by Alessio_1985 (Post 390276)
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! http://www.cfd-online.com/Forums/ope...-parafoam.html

Quote:

Originally Posted by Alessio_1985 (Post 390276)
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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