objectivePowerDissipation.C

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    Copyright (C) 2013-2022 FOSS GP
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License
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#include "objectivePowerDissipation.H"
#include "incompressibleAdjointSolver.H"
#include "createZeroField.H"
#include "IOmanip.H"
#include "addToRunTimeSelectionTable.H"

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

namespace Foam
{

namespace objectives
{

// * * * * * * * * * * * * * * Static Data Members * * * * * * * * * * * * * //

defineTypeNameAndDebug(objectivePowerDissipation, 0);
addToRunTimeSelectionTable
(
    objectiveIncompressible,
    objectivePowerDissipation,
    dictionary
);


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

objectivePowerDissipation::objectivePowerDissipation
(
    const fvMesh& mesh,
    const dictionary& dict,
    const word& adjointSolverName,
    const word& primalSolverName
)
:
    objectiveIncompressible(mesh, dict, adjointSolverName, primalSolverName),
    zones_(mesh_.cellZones().indices(dict.get<wordRes>("zones")))
{
    // Append Ua name to fieldNames
    /*
    fieldNames_.setSize
    (
        1,
        mesh_.lookupObject<solver>(adjointSolverName_).
            extendedVariableName("Ua")
    );
    */

    // Check if cellZones provided include at least one cell
    checkCellZonesSize(zones_);

    // Allocate dJdTMvar1Ptr_ and dJdTMvar2Ptr_ if needed
    allocatedJdTurbulence();

    // Allocate source term to the adjoint momentum equations
    dJdvPtr_.reset
    (
        createZeroFieldPtr<vector>
        (
            mesh_,
            "dJdv" + type(),
            dimLength/sqr(dimTime)
        )
    );
    // Allocate terms to be added to volume-based sensitivity derivatives
    divDxDbMultPtr_.reset
    (
        createZeroFieldPtr<scalar>
        (
            mesh_,
            ("divDxdbMult" + type()),
            // Dimensions are set in a way that the gradient of this term
            // matches the source of the adjoint grid displacement PDE
            sqr(dimLength)/pow3(dimTime)
        )
    );
    gradDxDbMultPtr_.reset
    (
        createZeroFieldPtr<tensor>
        (
            mesh_,
            ("gradDxdbMult" + type()),
            sqr(dimLength)/pow3(dimTime)
        )
    );
}


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

scalar objectivePowerDissipation::J()
{
    J_ = Zero;

    // References
    const volVectorField& U = vars_.UInst();
    const autoPtr<incompressible::turbulenceModel>& turb = vars_.turbulence();
    const scalarField& V = mesh_.V().field();

    volScalarField integrand(turb->nuEff()*magSqr(twoSymm(fvc::grad(U))));

    for (const label zI : zones_)
    {
        const cellZone& zoneI = mesh_.cellZones()[zI];
        scalarField VZone(V, zoneI);
        scalarField integrandZone(integrand.primitiveField(), zoneI);

        J_ += 0.5*gSum(integrandZone*VZone);
    }

    return J_;
}


void objectivePowerDissipation::update_dJdv()
{
    dJdvPtr_().primitiveFieldRef() = Zero;

    const volVectorField& U = vars_.U();
    const autoPtr<incompressible::turbulenceModel>& turb = vars_.turbulence();
    tmp<volSymmTensorField> S = twoSymm(fvc::grad(U));

    // Add source from possible dependencies of nut on U
    if (mesh_.foundObject<incompressibleAdjointSolver>(adjointSolverName_))
    {
        const incompressibleAdjointSolver& adjSolver =
            mesh_.lookupObject<incompressibleAdjointSolver>
                (adjointSolverName_);
        const autoPtr<incompressibleAdjoint::adjointRASModel>& adjointRAS =
            adjSolver.getAdjointVars().adjointTurbulence();
        tmp<volScalarField> dnutdUMult = 0.5*magSqr(S());
        tmp<volVectorField> dnutdU = adjointRAS->nutJacobianU(dnutdUMult);
        if (dnutdU)
        {
            for (const label zI : zones_)
            {
                const cellZone& zoneI = mesh_.cellZones()[zI];
                for (const label cellI : zoneI)
                {
                    dJdvPtr_()[cellI] = dnutdU()[cellI];
                }
            }
        }
    }

    // Add source from the strain rate magnitude
    volVectorField integrand(-2.0*fvc::div(turb->nuEff()*S));
    for (const label zI : zones_)
    {
        const cellZone& zoneI = mesh_.cellZones()[zI];
        for (const label cellI : zoneI)
        {
            dJdvPtr_()[cellI] += integrand[cellI];
        }
    }
}


void objectivePowerDissipation::update_dJdTMvar1()
{
    const volVectorField& U = vars_.U();
    volScalarField JacobianMultiplier(0.5*magSqr(twoSymm(fvc::grad(U))));
    update_dJdTMvar
    (
        dJdTMvar1Ptr_,
        &incompressibleAdjoint::adjointRASModel::nutJacobianTMVar1,
        JacobianMultiplier,
        zones_
    );
}


void objectivePowerDissipation::update_dJdTMvar2()
{
    const volVectorField& U = vars_.U();
    volScalarField JacobianMultiplier(0.5*magSqr(twoSymm(fvc::grad(U))));
    update_dJdTMvar
    (
        dJdTMvar2Ptr_,
        &incompressibleAdjoint::adjointRASModel::nutJacobianTMVar2,
        JacobianMultiplier,
        zones_
    );
}


void objectivePowerDissipation::update_divDxDbMultiplier()
{
    // References
    volScalarField& divDxDbMult = divDxDbMultPtr_();
    const volVectorField& U = vars_.U();
    const autoPtr<incompressible::turbulenceModel>& turb = vars_.turbulence();
    volScalarField integrand(0.5*turb->nuEff()*magSqr(twoSymm(fvc::grad(U))));

    for (const label zI : zones_)
    {
        const cellZone& zoneI = mesh_.cellZones()[zI];
        for (const label cellI : zoneI)
        {
            divDxDbMult[cellI] = integrand[cellI];
        }
    }
    divDxDbMult.correctBoundaryConditions();
}


void objectivePowerDissipation::update_gradDxDbMultiplier()
{
    // References
    volTensorField& gradDxDbMult = gradDxDbMultPtr_();
    const volVectorField& U = vars_.U();
    const autoPtr<incompressible::turbulenceModel>& turb = vars_.turbulence();
    tmp<volTensorField> gradU = fvc::grad(U);
    volTensorField integrand(-2.0*turb->nuEff()*(gradU() & twoSymm(gradU())));

    for (const label zI : zones_)
    {
        const cellZone& zoneI = mesh_.cellZones()[zI];
        for (const label cellI : zoneI)
        {
            gradDxDbMult[cellI] = integrand[cellI];
        }
    }
    gradDxDbMult.correctBoundaryConditions();
    // Missing contribution from gradU in nut
}


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

} // End namespace objectives
} // End namespace Foam

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