CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > Software User Forums > OpenFOAM > OpenFOAM Meshing & Mesh Conversion

[snappyHexMesh] snappyHexMesh not refining surfaces

Register Blogs Members List Search Today's Posts Mark Forums Read

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   June 1, 2010, 04:55
Default snappyHexMesh not refining surfaces
  #1
New Member
 
Dan, Mai-Chi and Marion
Join Date: Mar 2010
Posts: 9
Rep Power: 16
Hydro1004 is on a distinguished road
Hi all,

I'm trying to mesh a hull using snappyHexMesh, but for some reason, the surface isn't getting refined:

Surface refinement iteration 0
------------------------------

Marked for refinement due to surface intersection : 0 cells.
Marked for refinement due to curvature/regions : 0 cells.
Determined cells to refine in = 0 s
Selected for refinement : 0 cells (out of 840)
Stopping refining since too few cells selected.

This is my blockMeshDict file:

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            "";
    case            "";
    instance        "";
    local           "";

    class           dictionary;
    object          blockMeshDict;
}

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


convertToMeters 1;

vertices
(
    (-10000 0 -2500)
    (2000 0 -2500)
    (2000  2500 -2500)
    (-10000  2500 -2500)
    (-10000 0 1000)
    (2000 0 1000)
    (2000  2500 1000)
    (-10000  2500 1000)
);

blocks
(
    hex (0 1 2 3 4 5 6 7) (24 5 7) simpleGrading (1 1 1)
);

edges
(
);

patches
(
    patch inlet
    (
        (1 2 6 5)    
    )
    patch outlet
    (
        (0 4 7 3)    
    )
    patch top
    (
        (4 5 6 7)        
    )
    patch base
    (
        (0 3 2 1)            
    )
    patch wall
    (
        (3 7 6 2)            
    )
    symmetryPlane symmetry
    (
        (0 1 5 4)
    )
    
);

// ************************************************************************* //
And here is my snappyHexMeshDict file:

Code:
/*--------------------------------*- C++ -*----------------------------------*\
| =========                 |                                                 |
| \\      /  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;
    class       dictionary;
    object      snappyHexMeshDict;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

// Which of the steps to run
castellatedMesh true;
snap            false;
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
{
    Hull4669_shifted.stl
    {
        type triSurfaceMesh;
        name Hull4669_shifted;
    }

    refinementBox1
    {
        type searchableBox;
        min (-2700 0 -200);
        max (280 350 370);
    }
    
};



// Settings for the castellatedMesh generation.
castellatedMeshControls
{

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

    // While refining maximum number of cells per processor. This is basically
    // the number of cells that fit on a processor. If you choose this too small
    // it will do just more refinement iterations to obtain a similar mesh.
    maxLocalCells 1000000;

    // 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 10;

    // Number of buffer layers between different levels.
    // 1 means normal 2:1 refinement restriction, larger means slower
    // refinement.
    nCellsBetweenLevels 3;



    // 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 "someLine.eMesh";
        //    level 2;
        //}
    );



    // 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
    {
        Hull4669_shifted
        {
            // Surface-wise min and max refinement level
            level (5 6);
        }
    }

    // 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
    {
        refinementBox1
        {
            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.
    locationInMesh (1000 0 0);
}



// 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 10.0;

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

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



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

    // Per final patch (so not geometry!) the layer information
    layers
    {
        "Hull4669_shifted.*"
        {
            nSurfaceLayers 3;
        }
    }

    // Expansion factor for layer mesh
    expansionRatio 1.0;

    //- 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.
    finalLayerThickness 0.3;

    //- 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.
    nGrow 1;


    // Advanced settings

    //- When not to extrude surface. 0 is flat surface, 90 is when two faces
    //  make straight angle.
    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 10;

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

    // Reduce layer growth where ratio thickness to medial
    // distance is large
    maxThicknessToMedialRatio 0.3;

    // Angle used to pick up medial axis points
    minMedianAxisAngle 130;

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

    // Overall max number of layer addition iterations
    nLayerIter 50;
}



// Generic mesh quality settings. At any undoable phase these determine
// where to undo.
meshQualityControls
{
    //- Maximum non-orthogonality allowed. Set to 180 to disable.
    maxNonOrtho 65;

    //- Max skewness allowed. Set to <0 to disable.
    maxBoundarySkewness 20;
    maxInternalSkewness 4;

    //- Max concaveness allowed. Is angle (in degrees) below which concavity
    //  is allowed. 0 is straight face, <0 would be convex face.
    //  Set to 180 to disable.
    maxConcave 80;

    //- Minimum projected area v.s. actual area. Set to -1 to disable.
    minFlatness 0.5;

    //- Minimum pyramid volume. Is absolute volume of cell pyramid.
    //  Set to very negative number (e.g. -1E30) to disable.
    minVol 1e-13;

    //- Minimum face area. Set to <0 to disable.
    minArea -1;

    //- Minimum face twist. Set to <-1 to disable. dot product of face normal
    //- and face centre triangles normal
    minTwist 0.02;

    //- minimum normalised cell determinant
    //- 1 = hex, <= 0 = folded or flattened illegal cell
    minDeterminant 0.001;

    //- minFaceWeight (0 -> 0.5)
    minFaceWeight 0.02;

    //- minVolRatio (0 -> 1)
    minVolRatio 0.01;

    //must be >0 for Fluent compatibility
    minTriangleTwist -1;


    // Advanced

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


// Advanced

// Flags for optional output
// 0 : only write final meshes
// 1 : write intermediate meshes
// 2 : write volScalarField with cellLevel for postprocessing
// 4 : write current intersections as .obj files
debug 0;


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


// ************************************************************************* //
Any help is appreciated!

Thanks,

Mai Chi
Hydro1004 is offline   Reply With Quote

Old   April 15, 2011, 11:14
Default
  #2
Senior Member
 
Awais Ali
Join Date: Feb 2010
Location: Germany
Posts: 128
Rep Power: 17
owayz is on a distinguished road
Send a message via MSN to owayz
I think there is some problem with your stl file. Try visualize your stl geometry with your mesh for blockmesh.
Because sHM is failing to find any intersection. This could mean that your stl file is not inside your mesh from blockmesh.
owayz is offline   Reply With Quote

Old   April 20, 2011, 08:13
Default
  #3
Member
 
longamon's Avatar
 
David Aljure
Join Date: Mar 2011
Location: CTTC Universidad Politécnica de Catalunya. Spain
Posts: 38
Rep Power: 15
longamon is on a distinguished road
My suggestion would be to check your dimensions, your domain is 12km x 2.5 km x 3.5km

try changing the convertToMeters parámeter to 100 (cm) or 1000 (mm) depending on the units you're using in the stl file.

Last edited by longamon; April 20, 2011 at 08:32.
longamon is offline   Reply With Quote

Old   August 29, 2012, 12:56
Default
  #4
Member
 
R. P.
Join Date: Jul 2010
Posts: 73
Rep Power: 16
Rophys is on a distinguished road
Hi Folks,

I'm having the same problem. When I ran the snnapyHexMesh it performed the castellated mesh and also the surface snap but the surface refinement is not working, nothing happened on it and the cells in my surface still the same size as the background mesh (a cube). Do you have some idea to overcome this issue ?

Many thanks.
Rophys is offline   Reply With Quote

Reply

Tags
snappy, snappyhexmesh

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
[snappyHexMesh] creating baffles using snappyHexMesh (for given random shaped surfaces) ashish.svm OpenFOAM Meshing & Mesh Conversion 1 January 17, 2018 02:24
[snappyHexMesh] snappyHexMesh for Intersecting surfaces Anamitra OpenFOAM Meshing & Mesh Conversion 0 June 14, 2016 06:38
[snappyHexMesh] MultiRegionMeshing with SnappyHexMesh - SplitMeshRegions doesnt pickup my surfaces Kenneth J. OpenFOAM Meshing & Mesh Conversion 0 January 30, 2015 11:07
[snappyHexMesh] problemes modelling surfaces with snappyhexmesh gija79 OpenFOAM Meshing & Mesh Conversion 5 June 30, 2010 14:50


All times are GMT -4. The time now is 19:00.