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[snappyHexMesh] Error when setting locationsInMesh

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Old   March 30, 2021, 21:43
Default Error when setting locationsInMesh
  #1
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Elone Sampaio
Join Date: Jul 2020
Location: Angola/Brasil
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Hi guys, I am trying to set up the snappyMultiRegionHeater tutorial. I have changed the mesh and am trying to set the locationsInMesh however I never seem to get the points right , I have tested it every which way.I have not changed anything in the tutorial other than the STL file and the blockMesh box. How to solve the error below?
Code:
Surface refinement iteration 1
------------------------------

Marked for refinement due to surface intersection          : 0 cells.
Determined cells to refine in = 0 s
Selected for refinement : 0 cells (out of 3189)
Stopping refining since too few cells selected.


Removing mesh beyond surface intersections
------------------------------------------

Setting cellZones according to locationsInMesh:
Location : (0.28 0 0.05)
    cellZone : heater
Location : (0.45 0.068 0.0266)
    cellZone : rightSolid
Location : (0.03 0 0.02)
    cellZone : leftSolid
Location : (0.11 0.035 0.098)
    cellZone : topAir
Location : (0.24 0.031 0)
    cellZone : bottomAir

For cellZone heater found point (0.28 0 0.05) in global region 0 out of 1 regions.
For cellZone rightSolid found point (0.45 0.068 0.0266) in global region 0 out of 1 regions.
--> FOAM Warning : 
    From void Foam::meshRefinement::findCellZoneInsideWalk(const pointField&, const labelList&, const labelList&, Foam::labelList&) const
    in file meshRefinement/meshRefinementBaffles.C at line 1699
    Cell 0 at (0.01375 0.0006666667 0.00375) is inside cellZone rightSolid from locationInMesh (0.45 0.068 0.0266) but already marked as being in zone heater
This can happen if your surfaces are not (sufficiently) closed.
--> FOAM Warning : 
    From void Foam::meshRefinement::findCellZoneInsideWalk(const pointField&, const labelList&, const labelList&, Foam::labelList&) const
    in file meshRefinement/meshRefinementBaffles.C at line 1699
    Cell 1 at (0.01375 0.003333333 0.00375) is inside cellZone rightSolid from locationInMesh (0.45 0.068 0.0266) but already marked as being in zone heater
This can happen if your surfaces are not (sufficiently) closed.
--> FOAM Warning : 
    From void Foam::meshRefinement::findCellZoneInsideWalk(const pointField&, const labelList&, const labelList&, Foam::labelList&) const
    in file meshRefinement/meshRefinementBaffles.C at line 1699
    Cell 2 at (0.01375 0.006 0.00375) is inside cellZone rightSolid from locationInMesh (0.45 0.068 0.0266) but already marked as being in zone heater
This can happen if your surfaces are not (sufficiently) closed.
--> FOAM Warning : 
    From void Foam::meshRefinement::findCellZoneInsideWalk(const pointField&, const labelList&, const labelList&, Foam::labelList&) const
    in file meshRefinement/meshRefinementBaffles.C at line 1699
    Cell 3 at (0.01375 0.008666667 0.00375) is inside cellZone rightSolid from locationInMesh (0.45 0.068 0.0266) but already marked as being in zone heater
This can happen if your surfaces are not (sufficiently) closed.
--> FOAM Warning : 
    From void Foam::meshRefinement::findCellZoneInsideWalk(const pointField&, const labelList&, const labelList&, Foam::labelList&) const
    in file meshRefinement/meshRefinementBaffles.C at line 1699
    Cell 4 at (0.0275 0.012 0.0075) is inside cellZone rightSolid from locationInMesh (0.45 0.068 0.0266) but already marked as being in zone heater
This can happen if your surfaces are not (sufficiently) closed.
--> FOAM Warning : 
    From void Foam::meshRefinement::findCellZoneInsideWalk(const pointField&, const labelList&, const labelList&, Foam::labelList&) const
    in file meshRefinement/meshRefinementBaffles.C at line 1699
    Cell 5 at (0.0275 0.01466667 0.0075) is inside cellZone rightSolid from locationInMesh (0.45 0.068 0.0266) but already marked as being in zone heater
This can happen if your surfaces are not (sufficiently) closed.
--> FOAM Warning : 
    From void Foam::meshRefinement::findCellZoneInsideWalk(const pointField&, const labelList&, const labelList&, Foam::labelList&) const
    in file meshRefinement/meshRefinementBaffles.C at line 1699
    Cell 6 at (0.01375 0.0006666667 0.01875) is inside cellZone rightSolid from locationInMesh (0.45 0.068 0.0266) but already marked as being in zone heater
This can happen if your surfaces are not (sufficiently) closed.
--> FOAM Warning : 
    From void Foam::meshRefinement::findCellZoneInsideWalk(const pointField&, const labelList&, const labelList&, Foam::labelList&) const
    in file meshRefinement/meshRefinementBaffles.C at line 1699
    Cell 7 at (0.01375 0.003333333 0.01875) is inside cellZone rightSolid from locationInMesh (0.45 0.068 0.0266) but already marked as being in zone heater
This can happen if your surfaces are not (sufficiently) closed.
--> FOAM Warning : 
    From void Foam::meshRefinement::findCellZoneInsideWalk(const pointField&, const labelList&, const labelList&, Foam::labelList&) const
    in file meshRefinement/meshRefinementBaffles.C at line 1699
    Cell 8 at (0.01375 0.006 0.01875) is inside cellZone rightSolid from locationInMesh (0.45 0.068 0.0266) but already marked as being in zone heater
This can happen if your surfaces are not (sufficiently) closed.
--> FOAM Warning : 
    From void Foam::meshRefinement::findCellZoneInsideWalk(const pointField&, const labelList&, const labelList&, Foam::labelList&) const
    in file meshRefinement/meshRefinementBaffles.C at line 1699
    Cell 9 at (0.01375 0.008666667 0.01875) is inside cellZone rightSolid from locationInMesh (0.45 0.068 0.0266) but already marked as being in zone heater
This can happen if your surfaces are not (sufficiently) closed.
For cellZone leftSolid found point (0.03 0 0.02) in global region 0 out of 1 regions.
--> FOAM Warning : 
    From void Foam::meshRefinement::findCellZoneInsideWalk(const pointField&, const labelList&, const labelList&, Foam::labelList&) const
    in file meshRefinement/meshRefinementBaffles.C at line 1699
    Cell 0 at (0.01375 0.0006666667 0.00375) is inside cellZone leftSolid from locationInMesh (0.03 0 0.02) but already marked as being in zone rightSolid
This can happen if your surfaces are not (sufficiently) closed.
--> FOAM Warning : 
    From void Foam::meshRefinement::findCellZoneInsideWalk(const pointField&, const labelList&, const labelList&, Foam::labelList&) const
    in file meshRefinement/meshRefinementBaffles.C at line 1699
    Cell 1 at (0.01375 0.003333333 0.00375) is inside cellZone leftSolid from locationInMesh (0.03 0 0.02) but already marked as being in zone rightSolid
This can happen if your surfaces are not (sufficiently) closed.
--> FOAM Warning : 
    From void Foam::meshRefinement::findCellZoneInsideWalk(const pointField&, const labelList&, const labelList&, Foam::labelList&) const
    in file meshRefinement/meshRefinementBaffles.C at line 1699
    Cell 2 at (0.01375 0.006 0.00375) is inside cellZone leftSolid from locationInMesh (0.03 0 0.02) but already marked as being in zone rightSolid
This can happen if your surfaces are not (sufficiently) closed.
--> FOAM Warning : 
    From void Foam::meshRefinement::findCellZoneInsideWalk(const pointField&, const labelList&, const labelList&, Foam::labelList&) const
    in file meshRefinement/meshRefinementBaffles.C at line 1699
    Cell 3 at (0.01375 0.008666667 0.00375) is inside cellZone leftSolid from locationInMesh (0.03 0 0.02) but already marked as being in zone rightSolid
This can happen if your surfaces are not (sufficiently) closed.

My SnappyhexDict file is set up like this.

Code:
/*--------------------------------*- C++ -*----------------------------------*\
| =========                 |                                                 |
| \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox           |
|  \\    /   O peration     | Version:  v1906                                 |
|   \\  /    A nd           | Web:      www.OpenFOAM.com                      |
|    \\/     M anipulation  |                                                 |
\*---------------------------------------------------------------------------*/
FoamFile
{
    version     2.0;
    format      ascii;
    class       dictionary;
    object      snappyHexMeshDict;
}

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

// Which of the steps to run
castellatedMesh true;
snap            true;
addLayers       false;


// Geometry. Definition of all surfaces. All surfaces are of class
// searchableSurface.
// Surfaces are used
// - to specify refinement for any mesh cell intersecting it
// - to specify refinement for any mesh cell inside/outside/near
// - to 'snap' the mesh boundary to the surface
geometry
{
    geom.stl
    {
        type triSurfaceMesh;
        name geom;
    }
}


// Settings for the castellatedMesh generation.
castellatedMeshControls
{

    // Refinement parameters
    // ~~~~~~~~~~~~~~~~~~~~~

    // If local number of cells is >= maxLocalCells on any processor
    // switches from from refinement followed by balancing
    // (current method) to (weighted) balancing before refinement.
    maxLocalCells 100000;

    // Overall cell limit (approximately). Refinement will stop immediately
    // upon reaching this number so a refinement level might not complete.
    // Note that this is the number of cells before removing the part which
    // is not 'visible' from the keepPoint. The final number of cells might
    // actually be a lot less.
    maxGlobalCells 2000000;

    // The surface refinement loop might spend lots of iterations
    // refining just a few cells. This setting will cause refinement
    // to stop if <= minimumRefine are selected for refinement. Note:
    // it will at least do one iteration (unless the number of cells
    // to refine is 0)
    minRefinementCells 5;

    // Number of buffer layers between different levels.
    // 1 means normal 2:1 refinement restriction, larger means slower
    // refinement.
    nCellsBetweenLevels 2;



    // Explicit feature edge refinement
    // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

    // Specifies a level for any cell intersected by its edges.
    // This is a featureEdgeMesh, read from constant/triSurface for now.
    features
    (
        {
            file "geom.extendedFeatureEdgeMesh";    //"geom.eMesh";
            level 1;
        }
    );



    // Surface based refinement
    // ~~~~~~~~~~~~~~~~~~~~~~~~

    // Specifies two levels for every surface. The first is the minimum level,
    // every cell intersecting a surface gets refined up to the minimum level.
    // The second level is the maximum level. Cells that 'see' multiple
    // intersections where the intersections make an
    // angle > resolveFeatureAngle get refined up to the maximum level.

    refinementSurfaces
    {
        geom
        {
            // Surface-wise min and max refinement level
            level (1 1);
        }
    }

    // Resolve sharp angles
    resolveFeatureAngle 30;


    // Region-wise refinement
    // ~~~~~~~~~~~~~~~~~~~~~~

    // Specifies refinement level for cells in relation to a surface. One of
    // three modes
    // - distance. 'levels' specifies per distance to the surface the
    //   wanted refinement level. The distances need to be specified in
    //   descending order.
    // - inside. 'levels' is only one entry and only the level is used. All
    //   cells inside the surface get refined up to the level. The surface
    //   needs to be closed for this to be possible.
    // - outside. Same but cells outside.

    refinementRegions
    {
        //refinementBox
        //{
        //    mode inside;
        //    levels ((1E15 4));
        //}
    }


    // Mesh selection
    // ~~~~~~~~~~~~~~

    // After refinement patches get added for all refinementSurfaces and
    // all cells intersecting the surfaces get put into these patches. The
    // section reachable from the locationInMesh is kept.
    // NOTE: This point should never be on a face, always inside a cell, even
    // after refinement.
    locationsInMesh 
    (
        (( 0.28 0.020  0.05) heater)
        (( 0.45  0.068  0.0266) rightSolid)
        ((0.03  0  0.02) leftSolid)
        ((0.11  0.035  0.098) topAir)
        ((0.24 0.031  0) bottomAir)
    );

    // Whether any faceZones (as specified in the refinementSurfaces)
    // are only on the boundary of corresponding cellZones or also allow
    // free-standing zone faces. Not used if there are no faceZones.
    allowFreeStandingZoneFaces false;
}



// Settings for the snapping.
snapControls
{
    //- Number of patch smoothing iterations before finding correspondence
    //  to surface
    nSmoothPatch 3;

    //- Relative distance for points to be attracted by surface feature point
    //  or edge. True distance is this factor times local
    //  maximum edge length.
    tolerance 1.0;

    //- Number of mesh displacement relaxation iterations.
    nSolveIter 30;

    //- Maximum number of snapping relaxation iterations. Should stop
    //  before upon reaching a correct mesh.
    nRelaxIter 5;

    //- Highly experimental and wip: number of feature edge snapping
    //  iterations. Leave out altogether to disable.
    //  Of limited use in this case since faceZone faces not handled.
    nFeatureSnapIter 10;
}



// Settings for the layer addition.
addLayersControls
{
    relativeSizes true;

    // Per final patch (so not geometry!) the layer information
    layers
    {
        maxY
        {
            nSurfaceLayers 3;
        }
    }

    // Expansion factor for layer mesh
    expansionRatio 1.3;

    // Wanted thickness of final added cell layer. If multiple layers
    // is the thickness of the layer furthest away from the wall.
    // Relative to undistorted size of cell outside layer.
    // See relativeSizes parameter.
    finalLayerThickness 1;

    // Minimum thickness of cell layer. If for any reason layer
    // cannot be above minThickness do not add layer.
    // Relative to undistorted size of cell outside layer.
    minThickness 0.1;

    // If points get not extruded do nGrow layers of connected faces that are
    // also not grown. This helps convergence of the layer addition process
    // close to features.
    // Note: changed(corrected) w.r.t 1.7.x! (didn't do anything in 1.7.x)
    nGrow 0;

    // Advanced settings

    // When not to extrude surface. 0 is flat surface, 90 is when two faces
    // are perpendicular
    featureAngle 30;

    // Maximum number of snapping relaxation iterations. Should stop
    // before upon reaching a correct mesh.
    nRelaxIter 3;

    // Number of smoothing iterations of surface normals
    nSmoothSurfaceNormals 1;

    // Number of smoothing iterations of interior mesh movement direction
    nSmoothNormals 3;

    // Smooth layer thickness over surface patches
    nSmoothThickness 2;

    // Stop layer growth on highly warped cells
    maxFaceThicknessRatio 0.5;

    // Reduce layer growth where ratio thickness to medial
    // distance is large
    maxThicknessToMedialRatio 1;

    // Angle used to pick up medial axis points
    // Note: changed(corrected) w.r.t 1.7.x! 90 degrees corresponds to 130
    // in 1.7.x.
    minMedialAxisAngle 90;

    // Create buffer region for new layer terminations
    nBufferCellsNoExtrude 0;

    // Overall max number of layer addition iterations. The mesher will exit
    // if it reaches this number of iterations; possibly with an illegal
    // mesh.
    nLayerIter 50;
}



// Generic mesh quality settings. At any undoable phase these determine
// where to undo.
meshQualityControls
{
    #include "meshQualityDict"

    // Advanced

    //- Number of error distribution iterations
    nSmoothScale 4;
    //- Amount to scale back displacement at error points
    errorReduction 0.75;
}


// Advanced

// Merge tolerance. Is fraction of overall bounding box of initial mesh.
// Note: the write tolerance needs to be higher than this.
mergeTolerance 1e-6;


// ************************************************************************* //
Attached Images
File Type: jpg mesh.jpg (93.2 KB, 23 views)
elonesampaio is offline   Reply With Quote

Old   April 3, 2021, 18:44
Default
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Claudio Boezio
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This issue typically occurs when there are (even minute) gaps in your STL file, as the output is suggesting ("This can happen if your surfaces are not (sufficiently) closed."). The consequence is that snappyHexMesh can't tell what's inside and what isn't. You could try searching the forum for something like "Making STL files watertight". There are also tutorials on youtube about this. Also make sure that the defined points don't lie on a cell face.

I see you use several points. Normally if your geometry file is closed and free of gaps, one point should be sufficient. Is the picture you attached of the geometry or domain?
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