snappyHexMesh : refine based on curvature

tutorials/mesh/snappyHexMesh/block_with_curvature/system/meshQualityDict

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+/*--------------------------------*- C++ -*----------------------------------*\
+| =========                 |                                                 |
+| \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox           |
+|  \\    /   O peration     | Version:  v2112                                 |
+|   \\  /    A nd           | Website:  www.openfoam.com                      |
+|    \\/     M anipulation  |                                                 |
+\*---------------------------------------------------------------------------*/
+FoamFile
+{
+    version     2.0;
+    format      ascii;
+    class       dictionary;
+    object      meshQualityDict;
+}
+// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
+
+//- 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. Set to very negative number (e.g. -1E30) to
+//  disable.
+//     <0 = inside out tet,
+//      0 = flat tet
+//      1 = regular tet
+minTetQuality 1e-15;
+
+//- Minimum face area. Set to <0 to disable.
+minArea -1;
+
+//- Minimum face twist. Set to <-1 to disable. dot product of face normal
+//  (itself the average of the triangle normals)
+//  and face centre triangles normal
+minTwist 0.02;
+
+//- Minimum normalised cell determinant. This is the determinant of all
+//  the areas of internal faces. It is a measure of how much of the
+//  outside area of the cell is to other cells. The idea is that if all
+//  outside faces of the cell are 'floating' (zeroGradient) the
+//  'fixedness' of the cell is determined by the area of the internal faces.
+//  1 = hex, <= 0 = folded or flattened illegal cell
+minDeterminant 0.001;
+
+//- Relative position of face in relation to cell centres (0.5 for orthogonal
+//  mesh) (0 -> 0.5)
+minFaceWeight 0.05;
+
+//- Volume ratio of neighbouring cells (0 -> 1)
+minVolRatio 0.01;
+
+//- Per triangle normal compared to that of preceding triangle. Must be >0
+//  for Fluent compatibility
+minTriangleTwist -1;
+
+
+//- If >0 : preserve cells with all points on the surface if the
+//  resulting volume after snapping (by approximation) is larger than
+//  minVolCollapseRatio times old volume (i.e. not collapsed to flat cell).
+//  If <0 : delete always.
+//minVolCollapseRatio 0.1;
+
+
+// ************************************************************************* //