Add the OpenFOAM source tree

tutorials/mesh/foamyHexMesh/blob/system/collapseDict

@@ -0,0 +1,84 @@
+/*--------------------------------*- C++ -*----------------------------------*\
+| =========                 |                                                 |
+| \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox           |
+|  \\    /   O peration     | Version:  dev                                   |
+|   \\  /    A nd           | Web:      www.OpenFOAM.org                      |
+|    \\/     M anipulation  |                                                 |
+\*---------------------------------------------------------------------------*/
+FoamFile
+{
+    version         2.0;
+    format          ascii;
+    class           dictionary;
+    object          collapseDict;
+}
+// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
+
+controlMeshQuality      on;
+
+collapseEdgesCoeffs
+{
+    // Edges shorter than this absolute value will be merged
+    minimumEdgeLength   1e-6;
+
+    // The maximum angle between two edges that share a point attached to
+    // no other edges
+    maximumMergeAngle   180;
+}
+
+collapseFacesCoeffs
+{
+    // The initial face length factor
+    initialFaceLengthFactor                 0.5;
+
+    // If the face can't be collapsed to an edge, and it has a span less than
+    // the target face length multiplied by this coefficient, collapse it
+    // to a point.
+    maxCollapseFaceToPointSideLengthCoeff   0.3;
+
+    // Allow early collapse of edges to a point
+    allowEarlyCollapseToPoint               on;
+
+    // Fraction to premultiply maxCollapseFaceToPointSideLengthCoeff by if
+    // allowEarlyCollapseToPoint is enabled
+    allowEarlyCollapseCoeff                 0.2;
+
+    // Defining how close to the midpoint (M) of the projected
+    // vertices line a projected vertex (X) can be before making this
+    // an invalid edge collapse
+    //
+    // X---X-g----------------M----X-----------g----X--X
+    //
+    // Only allow a collapse if all projected vertices are outwith
+    // guardFraction (g) of the distance form the face centre to the
+    // furthest vertex in the considered direction
+    guardFraction                           0.1;
+}
+
+controlMeshQualityCoeffs
+{
+    // Name of the dictionary that has the mesh quality coefficients used
+    // by motionSmoother::checkMesh
+    #include                    "meshQualityDict";
+
+    // The amount that minimumEdgeLength will be reduced by for each
+    // edge if that edge's collapse generates a poor quality face
+    edgeReductionFactor         0.5;
+
+    // The amount that initialFaceLengthFactor will be reduced by for each
+    // face if its collapse generates a poor quality face
+    faceReductionFactor         0.5;
+
+    // Maximum number of smoothing iterations for the reductionFactors
+    maximumSmoothingIterations  2;
+
+    // Maximum number of outer iterations is mesh quality checking is enabled
+    maximumIterations           10;
+
+    // Maximum number of iterations deletion of a point can cause a bad face
+    // to be constructed before it is forced to not be deleted
+    maxPointErrorCount          3;
+}
+
+
+// ************************************************************************* //