patchMeanVelocityForce.C

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    Copyright (C) 2015-2016 OpenFOAM Foundation
    Copyright (C) 2022 OpenCFD Ltd.
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License
    This file is part of OpenFOAM.

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#include "patchMeanVelocityForce.H"
#include "processorCyclicPolyPatch.H"
#include "addToRunTimeSelectionTable.H"

// * * * * * * * * * * * * * Static Member Functions * * * * * * * * * * * * //

namespace Foam
{
namespace fv
{
    defineTypeNameAndDebug(patchMeanVelocityForce, 0);
    addToRunTimeSelectionTable(option, patchMeanVelocityForce, dictionary);
}
}


// * * * * * * * * * * * * * * * * Constructors  * * * * * * * * * * * * * * //

Foam::fv::patchMeanVelocityForce::patchMeanVelocityForce
(
    const word& sourceName,
    const word& modelType,
    const dictionary& dict,
    const fvMesh& mesh
)
:
    meanVelocityForce(sourceName, modelType, dict, mesh),
    patch_(coeffs_.get<word>("patch")),
    patchi_(mesh.boundaryMesh().findPatchID(patch_))
{
    if (patchi_ < 0)
    {
        FatalIOErrorInFunction(dict)
            << "Cannot find patch " << patch_
            << exit(FatalIOError);
    }
}


// * * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * //

Foam::scalar Foam::fv::patchMeanVelocityForce::magUbarAve
(
    const volVectorField& U
) const
{
    FixedList<scalar, 2> sumAmagUsumA(Zero);

    sumAmagUsumA[0] +=
        sum
        (
            (flowDir_ & U.boundaryField()[patchi_])
          * mesh_.boundary()[patchi_].magSf()
        );
    sumAmagUsumA[1] += sum(mesh_.boundary()[patchi_].magSf());


    // If the mean velocity force is applied to a cyclic patch
    // for parallel runs include contributions from processorCyclic patches
    // generated from the decomposition of the cyclic patch
    const polyBoundaryMesh& patches = mesh_.boundaryMesh();

    if (Pstream::parRun() && isA<cyclicPolyPatch>(patches[patchi_]))
    {
        for
        (
            const label patchi
          : processorCyclicPolyPatch::patchIDs(patch_, patches)
        )
        {
            sumAmagUsumA[0] +=
                sum
                (
                    (flowDir_ & U.boundaryField()[patchi])
                  * mesh_.boundary()[patchi].magSf()
                );
            sumAmagUsumA[1] += sum(mesh_.boundary()[patchi].magSf());
        }
    }

    mesh_.reduce(sumAmagUsumA, sumOp<scalar>());

    return
    (
        sumAmagUsumA[0]
      / stabilise(sumAmagUsumA[1], VSMALL)
    );
}


// ************************************************************************* //