/*--------------------------------*- C++ -*----------------------------------*\
| =========                 |                                                 |
| \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox           |
|  \\    /   O peration     | Version:  v2512                                 |
|   \\  /    A nd           | Website:  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
{
    hub.obj
    {
        type        triSurfaceMesh;
        name        hub;
        regions
        {
            stdHub_1p5      { name    stdHub_1p5; }
        }
    }
    transmission.obj
    {
        type        triSurfaceMesh;
        name        transmission;
        regions
        {
            STI_YEH_Index-0 { name    STI_YEH_Index-0; }
        }
    }
    propeller.obj
    {
        type        triSurfaceMesh;
        name        propeller;
        regions
        {
            propeller_SS_blade3         { name propeller_SS_blade3; }
            propeller_SS_LE_blade3      { name propeller_SS_LE_blade3; }
            propeller_SS_TE_blade3      { name propeller_SS_TE_blade3; }
            propeller_PS_blade3         { name propeller_PS_blade3; }
            propeller_PS_LE_blade3      { name propeller_PS_LE_blade3; }
            propeller_PS_TE_blade3      { name propeller_PS_TE_blade3; }
            propeller_tip_blade3        { name propeller_tip_blade3; }
            propeller_tip_LE_blade3     { name propeller_tip_LE_blade3; }
            propeller_tip_TE_blade3     { name propeller_tip_TE_blade3; }
            propeller_root_blade3       { name propeller_root_blade3; }
            propeller_root_LE_blade3    { name propeller_root_LE_blade3; }
            propeller_root_TE_blade3    { name propeller_root_TE_blade3; }
            propeller_SS_blade2         { name propeller_SS_blade2; }
            propeller_SS_LE_blade2      { name propeller_SS_LE_blade2; }
            propeller_SS_TE_blade2      { name propeller_SS_TE_blade2; }
            propeller_PS_blade2         { name propeller_PS_blade2; }
            propeller_PS_LE_blade2      { name propeller_PS_LE_blade2; }
            propeller_PS_TE_blade2      { name propeller_PS_TE_blade2; }
            propeller_tip_blade2        { name propeller_tip_blade2; }
            propeller_tip_LE_blade2     { name propeller_tip_LE_blade2; }
            propeller_tip_TE_blade2     { name propeller_tip_TE_blade2; }
            propeller_root_blade2       { name propeller_root_blade2; }
            propeller_root_LE_blade2    { name propeller_root_LE_blade2; }
            propeller_root_TE_blade2    { name propeller_root_TE_blade2; }
            propeller_SS_blade1         { name propeller_SS_blade1; }
            propeller_SS_LE_blade1      { name propeller_SS_LE_blade1; }
            propeller_SS_TE_blade1      { name propeller_SS_TE_blade1; }
            propeller_PS_blade1         { name propeller_PS_blade1; }
            propeller_PS_LE_blade1      { name propeller_PS_LE_blade1; }
            propeller_PS_TE_blade1      { name propeller_PS_TE_blade1; }
            propeller_tip_blade1        { name propeller_tip_blade1; }
            propeller_tip_LE_blade1     { name propeller_tip_LE_blade1; }
            propeller_tip_TE_blade1     { name propeller_tip_TE_blade1; }
            propeller_root_blade1       { name propeller_root_blade1; }
            propeller_root_LE_blade1    { name propeller_root_LE_blade1; }
            propeller_root_TE_blade1    { name propeller_root_TE_blade1; }
            propeller_SS_blade0         { name propeller_SS_blade0; }
            propeller_SS_LE_blade0      { name propeller_SS_LE_blade0; }
            propeller_SS_TE_blade0      { name propeller_SS_TE_blade0; }
            propeller_PS_blade0         { name propeller_PS_blade0; }
            propeller_PS_LE_blade0      { name propeller_PS_LE_blade0; }
            propeller_PS_TE_blade0      { name propeller_PS_TE_blade0; }
            propeller_tip_blade0        { name propeller_tip_blade0; }
            propeller_tip_LE_blade0     { name propeller_tip_LE_blade0; }
            propeller_tip_TE_blade0     { name propeller_tip_TE_blade0; }
            propeller_root_blade0       { name propeller_root_blade0; }
            propeller_root_LE_blade0    { name propeller_root_LE_blade0; }
            propeller_root_TE_blade0    { name propeller_root_TE_blade0; }
        }
    }
}


// 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 10000000;

    // 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 200000000;

    // 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 0;

    // Allow a certain level of imbalance during refining
    // (since balancing is quite expensive)
    // Expressed as fraction of perfect balance (= overall number of cells /
    // nProcs). 0=balance always.
    maxLoadUnbalance 0.10;


    // 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        "innerCylinderSmall.eMesh";
//            level       4;
//        }
//        {
//            file        "outerCylinder.eMesh";
//            level       0;
//        }
        {
            file        "hub.eMesh";
            level       0;
        }
        {
            file        "transmission.eMesh";
            level       0;
        }
        {
            file        "propeller.eMesh";
            level       0;
        }
        {
            file        "propeller_hub_intersection.eMesh";
            level       0;
        }
    );



    // 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
    {
//        innerCylinderSmall
//        {
//            level       (4 4);
//
//            faceType    boundary;
//            cellZone    innerCylinderSmall;
//            faceZone    innerCylinderSmall;
//            cellZoneInside  inside;
//        }
//        outerCylinder
//        {
//            level       (0 0);
//        }
        hub
        {
            level       (4 4);
        }
        transmission
        {
            level       (4 4);
        }
        propeller
        {
            level       (4 4);
            // regions
            // {
            //     ".*_LE_.*" { level (6 7); }
            //     ".*_TE_.*" { level (6 7); }
            // }
        }
    }

    // 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
    {
//        innerCylinder
//        {
//            mode        inside;
//            levels      ((1E15 3));
//        }
//        innerCylinderSmall
//        {
//            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 (0.01 -0.5 0.01);


    // 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 300;

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

    // Feature snapping

        // Number of feature edge snapping iterations.
        // Leave out altogether to disable.
        nFeatureSnapIter 10;

        // Detect (geometric only) features by sampling the surface
        // (default=false).
        implicitFeatureSnap true;

        // Use castellatedMeshControls::features (default = true)
        explicitFeatureSnap false;

        // Detect features between multiple surfaces
        // (only for explicitFeatureSnap, default = false)
        multiRegionFeatureSnap true;
}



// Settings for the layer addition.
addLayersControls
{
    // Are the thickness parameters below relative to the undistorted
    // size of the refined cell outside layer (true) or absolute sizes (false).
    relativeSizes true;

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

    // 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.
    // See relativeSizes parameter.
    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.
    // 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 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
    // 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
{
    //- 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 pyramid volume. Is absolute volume of cell pyramid.
    //  Set to a sensible fraction of the smallest cell volume expected.
    //  Set to very negative number (e.g. -1E30) to disable.
    minVol 1e-13;

    //- Minimum quality of the tet formed by the face-centre
    //  and variable base point minimum decomposition triangles and
    //  the cell centre. This has to be a positive number for tracking
    //  to work. Set to very negative number (e.g. -1E30) to
    //  disable.
    //     <0 = inside out tet,
    //      0 = flat tet
    //      1 = regular tet
    minTetQuality -1; // 1e-30;

    //- 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 0.01;

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

    //- minFaceWeight (0 -> 0.5)
    minFaceWeight 0.05;

    //- 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;

    // Optional : some meshing phases allow usage of relaxed rules.
    // See e.g. addLayersControls::nRelaxedIter.
    relaxed
    {
        //- Maximum non-orthogonality allowed. Set to 180 to disable.
        maxNonOrtho 75;
    }
}



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


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