ATCUaGradU.C

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    Copyright (C) 2007-2023 PCOpt/NTUA
    Copyright (C) 2013-2023 FOSS GP
    Copyright (C) 2019 OpenCFD Ltd.
-------------------------------------------------------------------------------
License
    This file is part of OpenFOAM.
 
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#include "ATCUaGradU.H"
#include "addToRunTimeSelectionTable.H"
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
namespace Foam
{
 
// * * * * * * * * * * * * * * Static Data Members * * * * * * * * * * * * * //
 
defineTypeNameAndDebug(ATCUaGradU, 0);
addToRunTimeSelectionTable
(
    ATCModel,
    ATCUaGradU,
    dictionary
);
 
 
// * * * * * * * * * * * * * * * * Constructors  * * * * * * * * * * * * * * //
 
ATCUaGradU::ATCUaGradU
(
    const fvMesh& mesh,
    const incompressibleVars& primalVars,
    const incompressibleAdjointVars& adjointVars,
    const dictionary& dict
)
:
    ATCModel(mesh, primalVars, adjointVars, dict)
{}
 
 
// * * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * //
 
void ATCUaGradU::addATC(fvVectorMatrix& UaEqn)
{
    const volVectorField& U = primalVars_.U();
    const volVectorField& Ua = adjointVars_.UaInst();
    const surfaceScalarField& phi = primalVars_.phi();
    const surfaceScalarField& phia = adjointVars_.phiaInst();
 
    // Build Ua to go into the ATC term, based on whether to smooth field or not
    autoPtr<volVectorField> UaForATC(nullptr);
    if (reconstructGradients_)
    {
        UaForATC.reset(new volVectorField(fvc::reconstruct(phia)));
    }
    else
    {
        UaForATC.reset(new volVectorField(Ua));
    }
 
    // Main ATC term
    ATC_ = -fvc::grad(UaForATC(), "gradUaATC") & U;
 
    if (extraConvection_ > 0)
    {
        // Implicit part added to increase diagonal dominance
        UaEqn += ATClimiter_*extraConvection_*fvm::div(-phi, Ua);
 
        // Correct rhs due to implicitly augmenting the adjoint convection
        ATC_ += extraConvection_*(fvc::grad(UaForATC(), "gradUaATC")().T() & U);
    }
 
    // Zero ATC on cells next to given patch types
    smoothATC();
 
    // Actual ATC term
    UaEqn += ATC_.internalField();
}
 
 
tmp<volTensorField> ATCUaGradU::getFISensitivityTerm() const
{
    auto tvolSDTerm = volTensorField::New
    (
        "ATCFISensitivityTerm" + type(),
        IOobject::NO_REGISTER,
        mesh_,
        dimensionedTensor(sqr(dimLength)/pow(dimTime, 3), Zero)
    );
    auto& volSDTerm = tvolSDTerm.ref();
 
    const volVectorField& U = primalVars_.U();
    const volVectorField& Ua = adjointVars_.Ua();
 
    //const volScalarField& mask = getLimiter();
 
    volSDTerm -=
        Ua.component(0) * fvc::grad(U.component(0) * U)
      + Ua.component(1) * fvc::grad(U.component(1) * U)
      + Ua.component(2) * fvc::grad(U.component(2) * U);
 
    return tvolSDTerm;
}
 
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
} // End namespace Foam
 
// ************************************************************************* //