basicFvGeometryScheme.C

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/*---------------------------------------------------------------------------*\
  =========                 |
  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
   \\    /   O peration     |
    \\  /    A nd           | www.openfoam.com
     \\/     M anipulation  |
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    Copyright (C) 2020 OpenCFD Ltd.
-------------------------------------------------------------------------------
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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    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, see <http://www.gnu.org/licenses/>.
 
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#include "basicFvGeometryScheme.H"
#include "addToRunTimeSelectionTable.H"
#include "surfaceFields.H"
#include "volFields.H"
 
// * * * * * * * * * * * * * * Static Data Members * * * * * * * * * * * * * //
 
namespace Foam
{
    defineTypeNameAndDebug(basicFvGeometryScheme, 0);
    addToRunTimeSelectionTable(fvGeometryScheme, basicFvGeometryScheme, dict);
}
 
 
// * * * * * * * * * * * * * * * * Constructors  * * * * * * * * * * * * * * //
 
Foam::basicFvGeometryScheme::basicFvGeometryScheme
(
    const fvMesh& mesh,
    const dictionary& dict
)
:
    fvGeometryScheme(mesh, dict)
{}
 
 
// * * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * //
 
void Foam::basicFvGeometryScheme::movePoints()
{
    if (debug)
    {
        Pout<< "basicFvGeometryScheme::movePoints() : "
            << "recalculating primitiveMesh centres" << endl;
    }
    // Use lower level to calculate the geometry
    const_cast<fvMesh&>(mesh_).primitiveMesh::updateGeom();
}
 
 
Foam::tmp<Foam::surfaceScalarField> Foam::basicFvGeometryScheme::weights() const
{
    if (debug)
    {
        Pout<< "basicFvGeometryScheme::weights() : "
            << "Constructing weighting factors for face interpolation"
            << endl;
    }
 
    tmp<surfaceScalarField> tweights
    (
        new surfaceScalarField
        (
            IOobject
            (
                "weights",
                mesh_.pointsInstance(),
                mesh_,
                IOobject::NO_READ,
                IOobject::NO_WRITE,
                false // Do not register
            ),
            mesh_,
            dimless
        )
    );
    surfaceScalarField& weights = tweights.ref();
    weights.setOriented();
 
    // Set local references to mesh data
    // Note that we should not use fvMesh sliced fields at this point yet
    // since this causes a loop when generating weighting factors in
    // coupledFvPatchField evaluation phase
    const labelUList& owner = mesh_.owner();
    const labelUList& neighbour = mesh_.neighbour();
 
    const vectorField& Cf = mesh_.faceCentres();
    const vectorField& C = mesh_.cellCentres();
    const vectorField& Sf = mesh_.faceAreas();
 
    // ... and reference to the internal field of the weighting factors
    scalarField& w = weights.primitiveFieldRef();
 
    forAll(owner, facei)
    {
        // Note: mag in the dot-product.
        // For all valid meshes, the non-orthogonality will be less than
        // 90 deg and the dot-product will be positive.  For invalid
        // meshes (d & s <= 0), this will stabilise the calculation
        // but the result will be poor.
        scalar SfdOwn = mag(Sf[facei] & (Cf[facei] - C[owner[facei]]));
        scalar SfdNei = mag(Sf[facei] & (C[neighbour[facei]] - Cf[facei]));
        w[facei] = SfdNei/(SfdOwn + SfdNei);
    }
 
    surfaceScalarField::Boundary& wBf = weights.boundaryFieldRef();
 
    forAll(mesh_.boundary(), patchi)
    {
        mesh_.boundary()[patchi].makeWeights(wBf[patchi]);
    }
 
    if (debug)
    {
        Pout<< "basicFvGeometryScheme::weights : "
            << "Finished constructing weighting factors for face interpolation"
            << endl;
    }
    return tweights;
}
 
 
Foam::tmp<Foam::surfaceScalarField>
Foam::basicFvGeometryScheme::deltaCoeffs() const
{
    if (debug)
    {
        Pout<< "basicFvGeometryScheme::deltaCoeffs() : "
            << "Constructing differencing factors array for face gradient"
            << endl;
    }
 
    // Force the construction of the weighting factors
    // needed to make sure deltaCoeffs are calculated for parallel runs.
    (void)mesh_.weights();
 
    tmp<surfaceScalarField> tdeltaCoeffs
    (
        new surfaceScalarField
        (
            IOobject
            (
                "deltaCoeffs",
                mesh_.pointsInstance(),
                mesh_,
                IOobject::NO_READ,
                IOobject::NO_WRITE,
                false // Do not register
            ),
            mesh_,
            dimless/dimLength
        )
    );
    surfaceScalarField& deltaCoeffs = tdeltaCoeffs.ref();
    deltaCoeffs.setOriented();
 
 
    // Set local references to mesh data
    const volVectorField& C = mesh_.C();
    const labelUList& owner = mesh_.owner();
    const labelUList& neighbour = mesh_.neighbour();
 
    forAll(owner, facei)
    {
        deltaCoeffs[facei] = 1.0/mag(C[neighbour[facei]] - C[owner[facei]]);
    }
 
    surfaceScalarField::Boundary& deltaCoeffsBf =
        deltaCoeffs.boundaryFieldRef();
 
    forAll(deltaCoeffsBf, patchi)
    {
        const fvPatch& p = mesh_.boundary()[patchi];
        deltaCoeffsBf[patchi] = 1.0/mag(p.delta());
 
        // Optionally correct
        p.makeDeltaCoeffs(deltaCoeffsBf[patchi]);
    }
 
    return tdeltaCoeffs;
}
 
 
Foam::tmp<Foam::surfaceScalarField>
Foam::basicFvGeometryScheme::nonOrthDeltaCoeffs() const
{
    if (debug)
    {
        Pout<< "basicFvGeometryScheme::nonOrthDeltaCoeffs() : "
            << "Constructing differencing factors array for face gradient"
            << endl;
    }
 
    // Force the construction of the weighting factors
    // needed to make sure deltaCoeffs are calculated for parallel runs.
    weights();
 
    tmp<surfaceScalarField> tnonOrthDeltaCoeffs
    (
        new surfaceScalarField
        (
            IOobject
            (
                "nonOrthDeltaCoeffs",
                mesh_.pointsInstance(),
                mesh_,
                IOobject::NO_READ,
                IOobject::NO_WRITE,
                false // Do not register
            ),
            mesh_,
            dimless/dimLength
        )
    );
    surfaceScalarField& nonOrthDeltaCoeffs = tnonOrthDeltaCoeffs.ref();
    nonOrthDeltaCoeffs.setOriented();
 
 
    // Set local references to mesh data
    const volVectorField& C = mesh_.C();
    const labelUList& owner = mesh_.owner();
    const labelUList& neighbour = mesh_.neighbour();
    const surfaceVectorField& Sf = mesh_.Sf();
    const surfaceScalarField& magSf = mesh_.magSf();
 
    forAll(owner, facei)
    {
        vector delta = C[neighbour[facei]] - C[owner[facei]];
        vector unitArea = Sf[facei]/magSf[facei];
 
        // Standard cell-centre distance form
        //NonOrthDeltaCoeffs[facei] = (unitArea & delta)/magSqr(delta);
 
        // Slightly under-relaxed form
        //NonOrthDeltaCoeffs[facei] = 1.0/mag(delta);
 
        // More under-relaxed form
        //NonOrthDeltaCoeffs[facei] = 1.0/(mag(unitArea & delta) + VSMALL);
 
        // Stabilised form for bad meshes
        nonOrthDeltaCoeffs[facei] = 1.0/max(unitArea & delta, 0.05*mag(delta));
    }
 
    surfaceScalarField::Boundary& nonOrthDeltaCoeffsBf =
        nonOrthDeltaCoeffs.boundaryFieldRef();
 
    forAll(nonOrthDeltaCoeffsBf, patchi)
    {
        fvsPatchScalarField& patchDeltaCoeffs = nonOrthDeltaCoeffsBf[patchi];
 
        const fvPatch& p = patchDeltaCoeffs.patch();
 
        const vectorField patchDeltas(mesh_.boundary()[patchi].delta());
 
        forAll(p, patchFacei)
        {
            vector unitArea =
                Sf.boundaryField()[patchi][patchFacei]
               /magSf.boundaryField()[patchi][patchFacei];
 
            const vector& delta = patchDeltas[patchFacei];
 
            patchDeltaCoeffs[patchFacei] =
                1.0/max(unitArea & delta, 0.05*mag(delta));
        }
 
        // Optionally correct
        p.makeNonOrthoDeltaCoeffs(patchDeltaCoeffs);
    }
    return tnonOrthDeltaCoeffs;
}
 
 
Foam::tmp<Foam::surfaceVectorField>
Foam::basicFvGeometryScheme::nonOrthCorrectionVectors() const
{
    if (debug)
    {
        Pout<< "surfaceInterpolation::makeNonOrthCorrectionVectors() : "
            << "Constructing non-orthogonal correction vectors"
            << endl;
    }
 
    tmp<surfaceVectorField> tnonOrthCorrectionVectors
    (
        new surfaceVectorField
        (
            IOobject
            (
                "nonOrthCorrectionVectors",
                mesh_.pointsInstance(),
                mesh_,
                IOobject::NO_READ,
                IOobject::NO_WRITE,
                false // Do not register
            ),
            mesh_,
            dimless
        )
    );
    surfaceVectorField& corrVecs = tnonOrthCorrectionVectors.ref();
    corrVecs.setOriented();
 
    // Set local references to mesh data
    const volVectorField& C = mesh_.C();
    const labelUList& owner = mesh_.owner();
    const labelUList& neighbour = mesh_.neighbour();
    const surfaceVectorField& Sf = mesh_.Sf();
    const surfaceScalarField& magSf = mesh_.magSf();
    tmp<surfaceScalarField> tNonOrthDeltaCoeffs(nonOrthDeltaCoeffs());
    const surfaceScalarField& NonOrthDeltaCoeffs = tNonOrthDeltaCoeffs();
 
    forAll(owner, facei)
    {
        vector unitArea = Sf[facei]/magSf[facei];
        vector delta = C[neighbour[facei]] - C[owner[facei]];
 
        corrVecs[facei] = unitArea - delta*NonOrthDeltaCoeffs[facei];
    }
 
    // Boundary correction vectors set to zero for boundary patches
    // and calculated consistently with internal corrections for
    // coupled patches
 
    surfaceVectorField::Boundary& corrVecsBf = corrVecs.boundaryFieldRef();
 
    forAll(corrVecsBf, patchi)
    {
        fvsPatchVectorField& patchCorrVecs = corrVecsBf[patchi];
 
        const fvPatch& p = patchCorrVecs.patch();
 
        if (!patchCorrVecs.coupled())
        {
            patchCorrVecs = Zero;
        }
        else
        {
            const fvsPatchScalarField& patchNonOrthDeltaCoeffs =
                NonOrthDeltaCoeffs.boundaryField()[patchi];
 
            const vectorField patchDeltas(mesh_.boundary()[patchi].delta());
 
            forAll(p, patchFacei)
            {
                vector unitArea =
                    Sf.boundaryField()[patchi][patchFacei]
                   /magSf.boundaryField()[patchi][patchFacei];
 
                const vector& delta = patchDeltas[patchFacei];
 
                patchCorrVecs[patchFacei] =
                    unitArea - delta*patchNonOrthDeltaCoeffs[patchFacei];
            }
        }
 
        // Optionally correct
        p.makeNonOrthoCorrVectors(patchCorrVecs);
    }
 
    if (debug)
    {
        Pout<< "surfaceInterpolation::makeNonOrthCorrectionVectors() : "
            << "Finished constructing non-orthogonal correction vectors"
            << endl;
    }
    return tnonOrthCorrectionVectors;
}
 
 
// ************************************************************************* //