Additional refinement selection algorithm for polyhedral AMR

minCellSizeRefinement selects all cells with cell size defined as cube root of
cell volume is larger than specified cell size. Therefore, it assumes that the
cells are cubes or close to cubes.

src/dynamicMesh/topoChangerFvMesh/Make/files

@@ -15,6 +15,7 @@ dynamicPolyRefinementFvMesh/dynamicPolyRefinementFvMesh.C
 dynamicPolyRefinementFvMesh/refinementSelection/refinementSelection/refinementSelection.C
 dynamicPolyRefinementFvMesh/refinementSelection/fieldBoundsRefinement/fieldBoundsRefinement.C
 dynamicPolyRefinementFvMesh/refinementSelection/minCellVolumeRefinement/minCellVolumeRefinement.C
+dynamicPolyRefinementFvMesh/refinementSelection/minCellSizeRefinement/minCellSizeRefinement.C
 dynamicPolyRefinementFvMesh/refinementSelection/minPatchDistanceRefinement/minPatchDistanceRefinement.C
 dynamicPolyRefinementFvMesh/refinementSelection/compositeRefinementSelection/compositeRefinementSelection.C
 

src/dynamicMesh/topoChangerFvMesh/dynamicPolyRefinementFvMesh/refinementSelection/minCellSizeRefinement/minCellSizeRefinement.C

@@ -0,0 +1,128 @@
+/*---------------------------------------------------------------------------*\
+  =========                 |
+  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
+   \\    /   O peration     |
+    \\  /    A nd           | Copyright held by original author
+     \\/     M anipulation  |
+-------------------------------------------------------------------------------
+License
+    This file is part of OpenFOAM.
+
+    OpenFOAM is free software; you can redistribute it and/or modify it
+    under the terms of the GNU General Public License as published by the
+    Free Software Foundation; either version 2 of the License, or (at your
+    option) any later version.
+
+    OpenFOAM is distributed in the hope that it will be useful, but WITHOUT
+    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+    FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+    for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with OpenFOAM; if not, write to the Free Software Foundation,
+    Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+
+Author
+    Vuko Vukcevic, Wikki Ltd.  All rights reserved.
+
+\*---------------------------------------------------------------------------*/
+
+#include "minCellSizeRefinement.H"
+#include "addToRunTimeSelectionTable.H"
+#include "volFields.H"
+
+// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
+
+namespace Foam
+{
+
+defineTypeNameAndDebug(minCellSizeRefinement, 0);
+addToRunTimeSelectionTable
+(
+    refinementSelection,
+    minCellSizeRefinement,
+    dictionary
+);
+
+}
+
+// * * * * * * * * * * * * * * * * Constructors  * * * * * * * * * * * * * * //
+
+Foam::minCellSizeRefinement::minCellSizeRefinement
+(
+    const fvMesh& mesh,
+    const dictionary& dict
+)
+:
+    refinementSelection(mesh, dict),
+    minDelta_(readScalar(coeffDict().lookup("minCellSize")))
+{}
+
+
+// * * * * * * * * * * * * * * * * Destructor* * * * * * * * * * * * * * * * //
+
+Foam::minCellSizeRefinement::~minCellSizeRefinement()
+{}
+
+
+// * * * * * * * * * * * * Public Member Functions * * * * * * * * * * * * * //
+
+Foam::Xfer<Foam::labelList>
+Foam::minCellSizeRefinement::refinementCellCandidates() const
+{
+    // Get cell sizes: cube root of cell volume (assuming cube cells)
+    const scalarField cellSize = pow(mesh().V().field(), 1.0/3.0);
+
+    // Create storage for collection of cells. Assume that almost all of the
+    // cells will be marked to prevent excessive resizing.
+    dynamicLabelList refinementCandidates(mesh().nCells());
+
+    // Loop through cells and collect refinement candidates
+    forAll (cellSize, cellI)
+    {
+        if (cellSize[cellI] > minDelta_)
+        {
+            // Cell is larger than the specified minimum, append cell for
+            // potential refinement
+            refinementCandidates.append(cellI);
+        }
+    }
+
+    // Print out some information
+    Info<< "Selection algorithm " << type() << " selected "
+        << returnReduce(refinementCandidates.size(), sumOp<label>())
+        << " cells as refinement candidates."
+        << endl;
+
+    // Return the list in the Xfer container to prevent copying
+    return refinementCandidates.xfer();
+}
+
+
+Foam::Xfer<Foam::labelList>
+Foam::minCellSizeRefinement::unrefinementPointCandidates() const
+{
+    // Mark all points as unrefinement candidates since only split points may be
+    // considered for actual unrefinement and since this refinement criterion
+    // will be usually used in combination with others. VV, 15/Mar/2018.
+
+    // All points are unrefinement candidates
+    labelList unrefinementCandidates(mesh().nPoints());
+
+    forAll (unrefinementCandidates, pointI)
+    {
+        unrefinementCandidates[pointI] = pointI;
+    }
+
+    // Print out some information
+    Info<< "Selection algorithm " << type() << " selected "
+        << returnReduce(unrefinementCandidates.size(), sumOp<label>())
+        << " points as unrefinement candidates."
+        << endl;
+
+    // Return the list in the Xfer container to prevent copying
+    return unrefinementCandidates.xfer();
+}
+
+
+// ************************************************************************* //

src/dynamicMesh/topoChangerFvMesh/dynamicPolyRefinementFvMesh/refinementSelection/minCellSizeRefinement/minCellSizeRefinement.H

@@ -0,0 +1,111 @@
+/*---------------------------------------------------------------------------*\
+  =========                 |
+  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
+   \\    /   O peration     |
+    \\  /    A nd           | Copyright held by original author
+     \\/     M anipulation  |
+-------------------------------------------------------------------------------
+License
+    This file is part of OpenFOAM.
+
+    OpenFOAM is free software; you can redistribute it and/or modify it
+    under the terms of the GNU General Public License as published by the
+    Free Software Foundation; either version 2 of the License, or (at your
+    option) any later version.
+
+    OpenFOAM is distributed in the hope that it will be useful, but WITHOUT
+    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+    FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+    for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with OpenFOAM; if not, write to the Free Software Foundation,
+    Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+
+Class
+    Foam::minCellSizeRefinement
+
+Description
+    Selection of refinement cells based on a minimum cell size. Assumes that
+    cells are mostly cubic and compares the minimum cell size with V^1/3, where
+    V is the cell volume. If the cell size is larger than the specified one,
+    cell gets selected for refinement.
+
+SourceFiles
+    minCellSizeRefinement.C
+
+Author
+    Vuko Vukcevic, Wikki Ltd.  All rights reserved.
+
+\*---------------------------------------------------------------------------*/
+
+#ifndef minCellSizeRefinement_H
+#define minCellSizeRefinement_H
+
+#include "refinementSelection.H"
+
+// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
+
+namespace Foam
+{
+
+/*---------------------------------------------------------------------------*\
+                   Class minCellSizeRefinement Declaration
+\*---------------------------------------------------------------------------*/
+
+class minCellSizeRefinement
+:
+    public refinementSelection
+{
+    // Private data
+
+        //- Minimum cell size
+        scalar minDelta_;
+
+
+    // Private Member Functions
+
+        //- Disallow default bitwise copy construct
+        minCellSizeRefinement(const minCellSizeRefinement&);
+
+        //- Disallow default bitwise assignment
+        void operator=(const minCellSizeRefinement&);
+
+
+public:
+
+    //- Runtime type information
+    TypeName("minCellSizeRefinement");
+
+
+    // Constructors
+
+        //- Construct from components
+        minCellSizeRefinement(const fvMesh& mesh, const dictionary& dict);
+
+
+    //- Destructor
+    virtual ~minCellSizeRefinement();
+
+
+    // Member Functions
+
+        // Selection of refinement/unrefinement candidates
+
+            //- Return transferable list of cells to refine
+            virtual Xfer<labelList> refinementCellCandidates() const;
+
+            //- Return transferable list of split points to unrefine
+            virtual Xfer<labelList> unrefinementPointCandidates() const;
+};
+
+
+// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
+
+} // End namespace Foam
+
+// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
+
+#endif
+
+// ************************************************************************* //