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checkMesh error (High aspect ratio cells found)

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Old   July 14, 2014, 06:55
Default checkMesh error (High aspect ratio cells found)
  #1
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Ali Heidari
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When i made a cubic geometry by the following blockMesh file, and checkMesh, i receive 3 errors (please see below). When i run paraFoam, everything looks nice.
How can i solve this problem???

Best regards.

code:
Code:
/*--------------------------------*- C++ -*----------------------------------*\
| =========                 |                                                 |
| \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox           |
|  \\    /   O peration     | Version:  2.2.1                                 |
|   \\  /    A nd           | Web:      www.OpenFOAM.com                      |
|    \\/     M anipulation  |                                                 |
\*---------------------------------------------------------------------------*/
FoamFile
{
    version     2.0;
    format      ascii;
    class       dictionary;
    object      blockMeshDict;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

convertToMeters 0.01;

vertices        
(
    (0 0 0)    //0
    (1 0 0)    //1
    (1 0 1)    //2
    (0 0 1)    //3
    (0 1 0)    //4
    (1 1 0)    //5
    (1 1 1)    //6    
    (0 1 1)    //7
);

blocks          
(
    hex (0 1 2 3 4 5 6 7) (10 10 10) simpleGrading (1 1 1)
);

edges           
(
);

boundary
(
    inlet
    {
        type patch;
        faces
        (
            (0 1 5 4)
        );
    }
    outlet
    {
        type patch;
        faces
        (
            (3 2 6 7)
        );
    }
    bottom
    {
        type wall;
        faces
        (
            (0 3 7 4)
        );
    }
    top
    {
        type wall;
        faces
        (
            (1 2 6 5)
        );
    }
    front
    {
        type wall;
        faces
        (
            (4 5 6 7)
        );
    }
    back
    {
        type wall;
        faces
        (
            (0 1 2 3)
        );
    }
);

mergePatchPairs
(
);

// ************************************************************************* //
checkMesh error:

Code:
Checking geometry...
    Overall domain bounding box (0 0 0) (0.01 0.01 0.01)
    Mesh (non-empty, non-wedge) directions (1 1 1)
    Mesh (non-empty) directions (1 1 1)
    Boundary openness (5.64689e-18 -5.64689e-18 5.64689e-18) OK.
 ***High aspect ratio cells found, Max aspect ratio: 6.29961e+193, number of cells 1000
  <<Writing 1000 cells with high aspect ratio to set highAspectRatioCells
    Minimum face area = 1e-06. Maximum face area = 1e-06.  Face area magnitudes OK.
    Min volume = 2e-300. Max volume = 2e-300.  Total volume = 2e-297.  Cell volumes OK.
    Mesh non-orthogonality Max: 180 average: 180
 ***Number of non-orthogonality errors: 2700.
  <<Writing 2700 non-orthogonal faces to set nonOrthoFaces
 ***Error in face pyramids: 6000 faces are incorrectly oriented.
  <<Writing 3300 faces with incorrect orientation to set wrongOrientedFaces
    Max skewness = 2.5e-06 OK.
    Coupled point location match (average 0) OK.

Failed 3 mesh checks.

End
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Old   August 9, 2014, 09:33
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  #2
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Nima Sam
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Hello Dear Ali
it may returns to face orientation in blockMesh, you can use cavity geometry to create yours
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