ENH: streamLineBase - set tracking velocity field name to U by default

tutorials/combustion/fireFoam/LES/compartmentFire/system/snappyHexMeshDict

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+/*--------------------------------*- C++ -*----------------------------------*\
+| =========                 |                                                 |
+| \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox           |
+|  \\    /   O peration     | Version:  plus                                  |
+|   \\  /    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            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
+{
+    box1 //0.6x1x0.02  [cm]
+    {
+        type searchableBox;
+        min (-0.1 -0.01 -0.1);
+        max (0.1 0.30 0.1);
+    }
+};
+
+
+
+// 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 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 100;
+
+    // Number of buffer layers between different levels.
+    // 1 means normal 2:1 refinement restriction, larger means slower
+    // refinement.
+    nCellsBetweenLevels 1;
+
+    // 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.
+
+    features
+    (
+    );
+    resolveFeatureAngle 0;
+
+     refinementSurfaces
+     {
+     }
+
+    refinementRegions
+    {
+        box1
+        {
+            mode	inside;
+            levels	((1.0 1));
+        }
+    }
+
+
+    // 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 0.001);
+
+
+    // 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 true;
+
+}
+
+
+
+// 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 4.0;
+
+    //- 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
+{
+    // Are the thickness parameters below relative to the undistorted
+    // size of the refined cell outside layer (true) or absolute sizes (false).
+    relativeSizes false;
+
+    // Layer thickness specification. This can be specified in one of following
+    // ways:
+    // - expansionRatio and finalLayerThickness (cell nearest internal mesh)
+    // - expansionRatio and firstLayerThickness (cell on surface)
+    // - overall thickness and firstLayerThickness
+    // - overall thickness and finalLayerThickness
+    // - overall thickness and expansionRatio
+    //
+    // Note: the mode thus selected is global, i.e. one cannot override the
+    //       mode on a per-patch basis (only the values can be overridden)
+
+        // Expansion factor for layer mesh
+        expansionRatio 1.0;
+
+        // Wanted thickness of the layer furthest away from the wall.
+        // If relativeSizes this is relative to undistorted size of cell
+        // outside layer.
+        finalLayerThickness 0.3;
+
+        // Wanted thickness of the layer next to the wall.
+        // If relativeSizes this is relative to undistorted size of cell
+        // outside layer.
+        //firstLayerThickness 0.3;
+
+        // Wanted overall thickness of layers.
+        // If relativeSizes this is relative to undistorted size of cell
+        // outside layer.
+        //thickness 0.5
+
+
+    // Minimum overall thickness of total layers. If for any reason layer
+    // cannot be above minThickness do not add layer.
+    // If relativeSizes this is relative to undistorted size of cell
+    // outside layer..
+    minThickness 0.25;
+
+     // Per final patch (so not geometry!) the layer information
+    // Note: This behaviour changed after 21x. Any non-mentioned patches
+    //       now slide unless:
+    //          - nSurfaceLayers is explicitly mentioned to be 0.
+    //          - angle to nearest surface < slipFeatureAngle (see below)
+    layers
+    {
+    }
+        // 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 17x! (didn't do anything in 17x)
+    nGrow 0;
+        // Advanced settings
+
+
+    // Static analysis of starting mesh
+
+        // When not to extrude surface. 0 is flat surface, 90 is when two faces
+        // are perpendicular
+        featureAngle 130;
+
+        // Stop layer growth on highly warped cells
+        maxFaceThicknessRatio 0.5;
+
+
+    // Patch displacement
+
+        // Number of smoothing iterations of surface normals
+        nSmoothSurfaceNormals 1;
+
+        // Smooth layer thickness over surface patches
+        nSmoothThickness 10;
+
+        // Mesh shrinking
+
+        // Optional: at non-patched sides allow mesh to slip if extrusion
+        // direction makes angle larger than slipFeatureAngle. Default is
+        // 0.5*featureAngle.
+        slipFeatureAngle 30;
+
+        // Maximum number of snapping relaxation iterations. Should stop
+        // before upon reaching a correct mesh.
+        nRelaxIter 5;
+
+        // 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;
+
+        // Max number of iterations after which relaxed meshQuality controls
+        // get used. Up to nRelaxedIter it uses the settings in
+        // meshQualityControls,
+        // after nRelaxedIter it uses the values in
+        // meshQualityControls::relaxed.
+        nRelaxedIter 20;
+
+        // Additional reporting: if there are just a few faces where there
+        // are mesh errors (after adding the layers) print their face centres.
+        // This helps in tracking down problematic mesh areas.
+        //additionalReporting true;
+
+}
+
+
+
+// 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 tet volume. Is absolute volume of the tet formed by the
+    //  face-centre decomposition triangle and the cell centre.
+    //  Set to a sensible fraction of the smallest cell volume expected.
+    //  Set to very negative number (e.g. -1E30) to disable.
+    minTetVol 1e-20;
+
+    minTetQuality -1;
+
+    //- 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 0.05;
+
+    //- minimum normalised cell determinant
+    //- 1 = hex, <= 0 = folded or flattened illegal cell
+   // minDeterminant 0.001;
+    minDeterminant 1;
+
+    //- 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;
+}
+
+
+// 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;
+
+
+// ************************************************************************* //