[aminem]

Dear,
I need your help to improve my mesh
You can see a problematic mesh in picture
My snappyHexMesh file

/*--------------------------------*- C++ -*----------------------------------*\
| =========                 |                                                 |
| \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox           |
|  \\    /   O peration     | Version:  2.3.0                                 |
|   \\  /    A nd           | Web:      www.OpenFOAM.org                      |
|    \\/     M anipulation  |                                                 |
\*---------------------------------------------------------------------------*/
FoamFile
{
    version     2.0;
    format      ascii;
    class       dictionary;
    object      snappyHexMeshDict;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

    castellatedMesh true;
    snap true;
    addLayers true;
    geometry
    {
        cuve1.stl
        {
            type triSurfaceMesh;
            name cuve1;
        }

        cuve2.stl
        {
            type triSurfaceMesh;
            name cuve2;
        }

        cuve3.stl
        {
            type triSurfaceMesh;
            name cuve3;
        }

        H3.stl
        {
            type triSurfaceMesh;
            name H3;
        }

        H4.stl
        {
            type triSurfaceMesh;
            name H4;
        }

        shaft.stl
        {
            type triSurfaceMesh;
            name shaft;
        }

    }

    castellatedMeshControls
    {
        features
        (
        {
            file "H3.eMesh";
            levels ((0.01 3));
        }

        {
            file "H4.eMesh";
            levels ((0.01 3));
        }

        );
        refinementSurfaces
        {
            cuve1
            {
                level ( 1 1 );
            }

            cuve2
            {
                level ( 1 1 );
            }

            cuve3
            {
                level ( 1 1 );
            }

            H3
            {
                level ( 2 2 );
            }

            H4
            {
                level ( 2 2 );
            }

            shaft
            {
                level ( 2 2 );
            }

        }

        refinementRegions
        {
        }

        locationInMesh ( 0 0 0);
        maxLocalCells 100000;
        maxGlobalCells 2000000;
        minRefinementCells 0;
        nCellsBetweenLevels 1;
        resolveFeatureAngle 30.0;
        allowFreeStandingZoneFaces true;
        planarAngle 30;
        maxLoadUnbalance 0.1;
    }

    snapControls
    {
        nSolveIter 30;
        nSmoothPatch 3;
        tolerance 2.0;
        nRelaxIter 5;
        nFeatureSnapIter 10;
        implicitFeatureSnap true;
        explicitFeatureSnap true;
        multiRegionFeatureSnap true;
    }

    addLayersControls
    {
        layers
        {
            cuve2
            {
                nSurfaceLayers 3;
            }

            cuve3
            {
                nSurfaceLayers 3;
            }

            H3
            {
                nSurfaceLayers 3;
            }

            H4
            {
                nSurfaceLayers 3;
            }

            shaft
            {
                nSurfaceLayers 3;
            }

        }

        relativeSizes true;
        expansionRatio 1.0;
        finalLayerThickness 0.3;
        minThickness 0.25;
        nGrow 0;
        featureAngle 130;
        slipFeatureAngle 30;
        nRelaxIter 5;
        nSmoothSurfaceNormals 1;
        nSmoothNormals 3;
        nSmoothThickness 10;
        maxFaceThicknessRatio 0.5;
        maxThicknessToMedialRatio 0.3;
        minMedianAxisAngle 90;
        nBufferCellsNoExtrude 0;
        nLayerIter 50;
        nRelaxedIter 20;
    }

    meshQualityControls
    {
        maxNonOrtho 65;
        maxBoundarySkewness 20;
        maxInternalSkewness 4;
        maxConcave 80;
        minFlatness 0.5;
        minVol 1.0E-13;
        minTetQuality 1.0E-15;
        minArea -1.0;
        minTwist 0.02;
        minDeterminant 0.001;
        minFaceWeight 0.05;
        minVolRatio 0.01;
        minTriangleTwist -1.0;
        nSmoothScale 4;
        errorReduction 0.75;
    }

    debug 0;
    mergeTolerance 1.0E-6;
    autoBlockMesh false;

Thanks