[GauthamKrishnan]

I've ran blockMesh on the following blockMeshDict file and it worked out without any warnings, but upon running checkMesh it says there are 240 non-orthogonal faces. I've gone through the blockMeshDict file subsequently and have been unable to locate the error. Could someone please help me out in this regard?

blockMeshDict:

/*--------------------------------*- C++ -*----------------------------------*\
| ========= | |
| \\ / F ield | OpenFOAM: The Open Source CFD Toolbox |
| \\ / O peration | Version: 2.2.0 |
| \\ / A nd | Web: www.OpenFOAM.org |
| \\/ M anipulation | |
\*---------------------------------------------------------------------------*/
FoamFile
{
version 2.0;
format ascii;
class dictionary;
object blockMeshDict;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

convertToMeters 0.0001;

vertices
(
(0 0 0)
(300 0 0)
(0 2.5 0)
(300 2.5 0)
(0 4 0)
(300 4 0)
(0 30 0)
(300 30 0)
(0 0 0.1)
(300 0 0.1)
(0 2.5 0.1)
(300 2.5 0.1)
(0 4 0.1)
(300 4 0.1)
(0 30 0.1)
(300 30 0.1)
);

blocks
(
hex (0 1 3 2 8 9 11 10) (300 30 1) simpleGrading (1 1 1)
hex (2 3 5 4 10 11 13 12) (300 40 1) simpleGrading (1 1 1)
hex (4 5 7 6 12 13 15 14) (300 50 1) simpleGrading (1 1 1)
);

edges
(
);

boundary
(

bottomwall
{
type wall;
faces
(
(1 9 8 0)
);
}
topwall
{
type wall;
faces
(
(6 14 15 7)
);
}
leftwall
{
type cyclic;
neighbourPatch rightwall;
faces
(
(0 8 10 2)
(2 10 12 4)
(4 12 14 6)
);

}
rightwall
{
type cyclic;
neighbourPatch leftwall;
faces
(
(9 1 3 11)
(11 3 5 13)
(13 5 7 15)
);

}
frontAndBack
{
type empty;
faces
(
(1 0 2 3)
(3 2 4 5)
(5 4 6 7)
(8 9 11 10)
(10 11 13 12)
(12 13 15 14)
);
}
);

mergePatchPairs
(
);

// ************************************************** *********************** //

[GauthamKrishnan]

I think the non-orthogonality error might be due to cyclic boundary conditions on leftwall and rightwall. Can someone help me out with this?

[Flowkersma]

Hi,

OpenFOAM 2.4.x and 3.0.0 did not give any errors with your blockMeshDict file. If you want to see which faces cause the error, run

foamToVTK -faceSet nonOrthogonalFaces

and open the corresponding file inside VTK directory.

Best regards,
Mikko

[GauthamKrishnan]

Hi,
I've been using openFOAM 2.2.0 and checkmesh gives me this error. I've checked which faces are in non-orthogonal sets file, it's the right wall and the left wall,the ones with the cyclic boundary conditions. Is there a way to fix this?