CFD Online Discussion Forums - [snappyHexMesh] Problem with cell removal in SHM

Hi,

Iam trying to create a mesh for an internal flow with SHM. Everything i tried ended up with the refined background mesh but with no removed cells. I tried different stl's because i wasnt sure if they might have holes.

After that i found this tutorial:
http://www.hydroniumion.de/general/s...mesh-tutorial/

I took his .stl file and tried to run SHM again with the same result:

Code:

Removing mesh beyond surface intersections

------------------------------------------

Found point (0.3 0.3 -0.08) in cell 58028 in global region 0 out of 1 regions.

Keeping all cells in region 0 containing point (0.3 0.3 -0.08)

Selected for keeping : 127807 cells.

Edge intersection testing:

    Number of edges             : 392133

    Number of edges to retest   : 0

    Number of intersected edges : 1063

My snappyHexMeshDict looks like that:

Code:

/*---------------------------------------------------------------------------*\

| =========                |                                                |

| \\      /  F ield        | OpenFOAM: The Open Source CFD Toolbox          |

|  \\    /  O peration    | Version:  1.6                                  |

|  \\  /    A nd          | Web:      http://www.openfoam.org                |

|    \\/    M anipulation  |                                                |

\*---------------------------------------------------------------------------*/

FoamFile

{

    version        2.0;

    format          ascii;

    root            "/home/penfold/mattijs/foam/mattijs2.1/run/icoFoam";

    case            "cavity";

    instance        "system";

    local          "";

    class          dictionary;

    object          autoHexMeshDict;

}

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

castellatedMesh true;

snap            true;

addLayers      true;

mergeTolerance 1e-06;

geometry

{

    wigley.stl

    {

        type triSurfaceMesh;

        name Ofen;

    }

    refinementBox

    {

        type searchableBox;

        min (-10000 -1000 -10000);

        max (10000 11000 10000);

    }

}

castellatedMeshControls

{

    maxLocalCells 1000000;

    maxGlobalCells 5000000;

    minRefinementCells 1;

    nCellsBetweenLevels 2;

    features

    (

    );

    allowFreeStandingZoneFaces true;

    curvature       0.9925;

    maxLoadUnbalance 0.01;

    resolveFeatureAngle 30;

    refinementSurfaces

    {

        "Ofen_*"

        {

            level (1 2);

    faceZone Ofen;

            cellZone Ofen;

            zoneInside true;

        }

    }

    refinementRegions

    {

  

    }

    locationInMesh (0.3 0.3 -0.08);

}

snapControls

{

    nSmoothPatch 3;

    tolerance 4.0;

    nSolveIter 30;

    nRelaxIter 5;

}

addLayersControls

{

    relativeSizes true;

    layers

    {

//flowAirDuctReagent_flowAirDuctReagent

        //{

        //    nSurfaceLayers 1;

        //}

//flowAirDuctReagent_inlet1

        //{

        //    nSurfaceLayers 1;

        //}

//flowAirDuctReagent_inlet2

        //{

        //    nSurfaceLayers 1;

        //}

    }

    expansionRatio 1.0;

    finalLayerThickness 0.3;

    minThickness 0.1;

    nGrow 0;

    featureAngle 30;

    nRelaxIter 3;

    

    nLayerIter 50;

    nSmoothSurfaceNormals 1;

    nSmoothNormals 3;

    nSmoothThickness 10;

    maxFaceThicknessRatio 0.5;

    maxThicknessToMedialRatio 0.3;

    minMedianAxisAngle 130;

    nBufferCellsNoExtrude 0;

}



meshQualityControls

{

    maxNonOrtho 65;

    maxBoundarySkewness 20;

    maxInternalSkewness 4;

    maxConcave 80;

    minFlatness 0.5;

    minVol 0;

    minArea -1;

    minTwist 0.02;

    minDeterminant 0.001;

    minFaceWeight 0.02;

    minVolRatio 0.01;

    minTriangleTwist -1;

    nSmoothScale 4;

    errorReduction 0.75;

    minTetQuality 1;

}

What is wrong with my Dict file? Iam wondering because the defined locationInMesh Vector points to an existing cell (58028) but doesnt remove any cells.
Hope you can help me.