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-   OpenFOAM Native Meshers: blockMesh (http://www.cfd-online.com/Forums/openfoam-meshing-blockmesh/)
-   -   Mesh skewness warning how to get rid (http://www.cfd-online.com/Forums/openfoam-meshing-blockmesh/61859-mesh-skewness-warning-how-get-rid.html)

ploceus December 7, 2005 18:19

Hi. I created mesh input file
 
Hi.
I created mesh input file, and after running blockMesh, it produces points, faces and cells file. I can also use paraView to look at grids. They look fine but I have the following message below that can't get rid of. What does skewness mean? And how do I get rid of them?

Thanks.

Creating merge patch pairs

Adding point and face zones
Adding topology modifiers
--> FOAM Warning :
From function primitiveMesh::checkFaceSkewness(const bool report, labelHashSet* setPtr) const
in file meshes/primitiveMesh/primitiveMeshCheck.C at line 838
Large face skewness detected. Max skewness = 285.058 percent.
This may impair the quality of the result.
212 highly skew faces detected.
Failed 1 mesh geometry checks.
Failed some mesh checks.

Writing polyMesh

hjasak December 7, 2005 20:37

Mesh skewness means that the l
 
Mesh skewness means that the line connecting two cell centres misses the centre of the face between them, in your case by quite a lot.

This is only a warning and you can probably ignore it, but beware of the influence of the disretisation error to the solution accuracy in that region.

If you want to remove the error, you need to work on making a better mesh.

Enjoy,

Hrv

jmmeena July 1, 2009 05:01

comparing with Fluent
 
Respected Sir,

Can you please tell relation between mesh skewness reported by gambit and mesh skewness reported by OpenFOAM.

What is the upper limit of mesh skewness in OpenFOAM which can be related to 0.92 in gambit.

regards,
JM


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