cellAspectRatio.C

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/*---------------------------------------------------------------------------*\
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  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
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    \\  /    A nd           | www.openfoam.com
     \\/     M anipulation  |
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    Copyright (C) 2020-2021 OpenCFD Ltd.
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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 3 of the License, or
    (at your option) any later version.
 
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    FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
    for more details.
 
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#include "cellAspectRatio.H"
 
// * * * * * * * * * * * * * * Static Data Members * * * * * * * * * * * * * //
 
namespace Foam
{
    defineTypeNameAndDebug(cellAspectRatio, 0);
}
 
 
// * * * * * * * * * * * * * * * * Constructors * * * * * * * * * * * * * * //
 
Foam::cellAspectRatio::cellAspectRatio(const polyMesh& mesh)
:
    MeshObject<polyMesh, Foam::MoveableMeshObject, cellAspectRatio>(mesh)
{
    calcAspectRatio();
}
 
 
// * * * * * * * * * * * * * * * * Destructor * * * * * * * * * * * * * * * //
 
Foam::cellAspectRatio::~cellAspectRatio()
{}
 
 
// * * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * //
 
void Foam::cellAspectRatio::calcAspectRatio()
{
    if (debug)
    {
        InfoInFunction << "Calculating cell aspect ratio" << endl;
    }
 
    const polyMesh& mesh = mesh_;
    const pointField& cellCentres = mesh.cellCentres();
    const scalarField& cellVolumes = mesh.cellVolumes();
    const vectorField& faceAreas = mesh.faceAreas();
    const vectorField& faceCentres = mesh.faceCentres();
    const cellList& cells = mesh.cells();
    //const faceList& faces = mesh.faces();
    //const pointField& points = mesh.points();
 
    scalarField& aRatio = *this;
    aRatio.setSize(mesh.nCells());
 
    forAll(cells, celli)
    {
        const point& cc = cellCentres[celli];
        const cell& cFaces = cells[celli];
 
        scalar sumA = Zero;
        scalar maxMag = Zero;
 
        for (const label facei : cFaces)
        {
            const vector& n = faceAreas[facei];
 
            sumA += mag(n);
 
            //const face& f = faces[facei];
            //for (const label pointi : f)
            //{
            //    const point& pt = points[pointi];
            //    const vector d(pt-cc);
            //    maxMag = max(maxMag, magSqr(d));
            //}
 
            // Max distance from face centre to cell centre
            const point& fc = faceCentres[facei];
            maxMag = max(maxMag, magSqr(fc-cc));
        }
        sumA /= cFaces.size();
 
        aRatio[celli] = 1.0;
        if (sumA > ROOTVSMALL)
        {
            // Local length scale
            const scalar length = cellVolumes[celli]/sumA;
 
            if (length > ROOTVSMALL)
            {
                // Max edge length
                maxMag = Foam::sqrt(maxMag);
 
                //aRatio[celli] = Foam::sqrt(4.0/3.0)*maxMag/length;
                aRatio[celli] = 2.0*maxMag/length;
            }
        }
    }
 
    if (debug)
    {
        InfoInFunction << "Calculated cell aspect ratio min:" << gMin(aRatio)
            << " max:" << gMax(aRatio) << " average:" << gAverage(aRatio)
            << endl;
    }
}
 
 
// ************************************************************************* //