variableHeightFlowRateInletVelocityFvPatchVectorField.C

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    Copyright (C) 2021 OpenCFD Ltd.
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#include "variableHeightFlowRateInletVelocityFvPatchVectorField.H"
#include "addToRunTimeSelectionTable.H"
#include "volFields.H"

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

Foam::variableHeightFlowRateInletVelocityFvPatchVectorField
::variableHeightFlowRateInletVelocityFvPatchVectorField
(
    const fvPatch& p,
    const DimensionedField<vector, volMesh>& iF
)
:
    fixedValueFvPatchField<vector>(p, iF),
    flowRate_(),
    alphaName_("none")
{}


Foam::variableHeightFlowRateInletVelocityFvPatchVectorField
::variableHeightFlowRateInletVelocityFvPatchVectorField
(
    const fvPatch& p,
    const DimensionedField<vector, volMesh>& iF,
    const dictionary& dict
)
:
    fixedValueFvPatchField<vector>(p, iF, dict),
    flowRate_(Function1<scalar>::New("flowRate", dict, &db())),
    alphaName_(dict.lookup("alpha"))
{}


Foam::variableHeightFlowRateInletVelocityFvPatchVectorField
::variableHeightFlowRateInletVelocityFvPatchVectorField
(
    const variableHeightFlowRateInletVelocityFvPatchVectorField& ptf,
    const fvPatch& p,
    const DimensionedField<vector, volMesh>& iF,
    const fvPatchFieldMapper& mapper
)
:
    fixedValueFvPatchField<vector>(ptf, p, iF, mapper),
    flowRate_(ptf.flowRate_.clone()),
    alphaName_(ptf.alphaName_)
{}


Foam::variableHeightFlowRateInletVelocityFvPatchVectorField
::variableHeightFlowRateInletVelocityFvPatchVectorField
(
    const variableHeightFlowRateInletVelocityFvPatchVectorField& ptf
)
:
    fixedValueFvPatchField<vector>(ptf),
    flowRate_(ptf.flowRate_.clone()),
    alphaName_(ptf.alphaName_)
{}


Foam::variableHeightFlowRateInletVelocityFvPatchVectorField
::variableHeightFlowRateInletVelocityFvPatchVectorField
(
    const variableHeightFlowRateInletVelocityFvPatchVectorField& ptf,
    const DimensionedField<vector, volMesh>& iF
)
:
    fixedValueFvPatchField<vector>(ptf, iF),
    flowRate_(ptf.flowRate_.clone()),
    alphaName_(ptf.alphaName_)
{}


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

void Foam::variableHeightFlowRateInletVelocityFvPatchVectorField::updateCoeffs()
{
    if (updated())
    {
        return;
    }

    const auto& mesh = patch().boundaryMesh().mesh();
    auto& alpha = mesh.lookupObjectRef<volScalarField>(alphaName_);

    // Update alpha boundary (if needed) due to mesh changes
    if (!mesh.upToDatePoints(alpha))
    {
        auto& alphabf = alpha.boundaryFieldRef();

        if (!alphabf[patch().index()].updated())
        {
            DebugInfo<< "Updating alpha BC due to mesh changes" << endl;
            alphabf.evaluateSelected(labelList({ patch().index() }));
        }
    }

    scalarField alphap(alpha.boundaryField()[patch().index()]);

    alphap = max(alphap, scalar(0));
    alphap = min(alphap, scalar(1));

    const scalar t = db().time().timeOutputValue();
    scalar flowRate = flowRate_->value(t);

    // a simpler way of doing this would be nice
    scalar avgU = -flowRate/gSum(patch().magSf()*alphap);

    vectorField n(patch().nf());

    operator==(n*avgU*alphap);

    fixedValueFvPatchField<vector>::updateCoeffs();
}


void Foam::variableHeightFlowRateInletVelocityFvPatchVectorField::write
(
    Ostream& os
) const
{
    fvPatchField<vector>::write(os);
    flowRate_->writeData(os);
    os.writeEntry("alpha", alphaName_);
    fvPatchField<vector>::writeValueEntry(os);
}


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

namespace Foam
{
   makePatchTypeField
   (
       fvPatchVectorField,
       variableHeightFlowRateInletVelocityFvPatchVectorField
   );
}


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