Maxwell.C

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    Copyright (C) 2019-2023 OpenCFD Ltd.
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#include "Maxwell.H"
#include "fvOptions.H"
#include "uniformDimensionedFields.H"
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
namespace Foam
{
namespace laminarModels
{
 
// * * * * * * * * * * * * * * * * Constructors  * * * * * * * * * * * * * * //
 
template<class BasicTurbulenceModel>
Maxwell<BasicTurbulenceModel>::Maxwell
(
    const alphaField& alpha,
    const rhoField& rho,
    const volVectorField& U,
    const surfaceScalarField& alphaRhoPhi,
    const surfaceScalarField& phi,
    const transportModel& transport,
    const word& propertiesName,
    const word& type
)
:
    laminarModel<BasicTurbulenceModel>
    (
        type,
        alpha,
        rho,
        U,
        alphaRhoPhi,
        phi,
        transport,
        propertiesName
    ),
 
    nuM_("nuM", dimViscosity, this->coeffDict_),
 
    lambda_("lambda", dimTime, this->coeffDict_),
 
    sigma_
    (
        IOobject
        (
            IOobject::groupName("sigma", alphaRhoPhi.group()),
            this->runTime_.timeName(),
            this->mesh_,
            IOobject::MUST_READ,
            IOobject::AUTO_WRITE
        ),
        this->mesh_
    )
{
    if (type == typeName)
    {
        this->printCoeffs(type);
    }
}
 
 
// * * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * //
 
template<class BasicTurbulenceModel>
bool Maxwell<BasicTurbulenceModel>::read()
{
    if (laminarModel<BasicTurbulenceModel>::read())
    {
        nuM_.readIfPresent(this->coeffDict());
        lambda_.readIfPresent(this->coeffDict());
 
        return true;
    }
 
    return false;
}
 
 
template<class BasicTurbulenceModel>
tmp<Foam::volSymmTensorField>
Maxwell<BasicTurbulenceModel>::R() const
{
    return sigma_;
}
 
 
template<class BasicTurbulenceModel>
tmp<Foam::volSymmTensorField>
Maxwell<BasicTurbulenceModel>::devRhoReff() const
{
    return devRhoReff(this->U_);
}
 
 
template<class BasicTurbulenceModel>
tmp<Foam::volSymmTensorField>
Maxwell<BasicTurbulenceModel>::devRhoReff(const volVectorField& U) const
{
    return tmp<volSymmTensorField>
    (
        new volSymmTensorField
        (
            IOobject
            (
                IOobject::groupName("devRhoReff", this->alphaRhoPhi_.group()),
                this->runTime_.timeName(),
                this->mesh_,
                IOobject::NO_READ,
                IOobject::NO_WRITE
            ),
            this->alpha_*this->rho_*sigma_
          - (this->alpha_*this->rho_*this->nu())
           *devTwoSymm(fvc::grad(U))
        )
    );
}
 
 
template<class BasicTurbulenceModel>
tmp<Foam::fvVectorMatrix>
Maxwell<BasicTurbulenceModel>::divDevRhoReff
(
    volVectorField& U
) const
{
    return
    (
        fvc::div
        (
            this->alpha_*this->rho_*this->nuM_*fvc::grad(U)
        )
      + fvc::div(this->alpha_*this->rho_*sigma_)
      - fvc::div(this->alpha_*this->rho_*this->nu()*dev2(T(fvc::grad(U))))
      - fvm::laplacian(this->alpha_*this->rho_*nu0(), U)
    );
}
 
 
template<class BasicTurbulenceModel>
tmp<Foam::fvVectorMatrix>
Maxwell<BasicTurbulenceModel>::divDevRhoReff
(
    const volScalarField& rho,
    volVectorField& U
) const
{
    return
    (
        fvc::div
        (
            this->alpha_*rho*this->nuM_*fvc::grad(U)
        )
      + fvc::div(this->alpha_*rho*sigma_)
      - fvc::div(this->alpha_*rho*this->nu()*dev2(T(fvc::grad(U))))
      - fvm::laplacian(this->alpha_*rho*nu0(), U)
    );
}
 
 
template<class BasicTurbulenceModel>
void Maxwell<BasicTurbulenceModel>::correct()
{
    // Local references
    const alphaField& alpha = this->alpha_;
    const rhoField& rho = this->rho_;
    const surfaceScalarField& alphaRhoPhi = this->alphaRhoPhi_;
    const volVectorField& U = this->U_;
    volSymmTensorField& sigma = this->sigma_;
    fv::options& fvOptions(fv::options::New(this->mesh_));
 
    laminarModel<BasicTurbulenceModel>::correct();
 
    tmp<volTensorField> tgradU(fvc::grad(U));
    const volTensorField& gradU = tgradU();
 
    uniformDimensionedScalarField rLambda
    (
        IOobject
        (
            IOobject::groupName("rLambda", this->alphaRhoPhi_.group()),
            this->runTime_.constant(),
            this->mesh_
        ),
        1.0/(lambda_)
    );
 
    // Note sigma is positive on lhs of momentum eqn
    volSymmTensorField P
    (
        twoSymm(sigma & gradU)
      - nuM_*rLambda*twoSymm(gradU)
    );
 
    // Viscoelastic stress equation
    tmp<fvSymmTensorMatrix> sigmaEqn
    (
        fvm::ddt(alpha, rho, sigma)
      + fvm::div(alphaRhoPhi, sigma)
      + fvm::Sp(alpha*rho*rLambda, sigma)
     ==
        alpha*rho*P
      + fvOptions(alpha, rho, sigma)
    );
 
    sigmaEqn.ref().relax();
    fvOptions.constrain(sigmaEqn.ref());
    solve(sigmaEqn);
    fvOptions.correct(sigma_);
}
 
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
} // End namespace laminarModels
} // End namespace Foam
 
// ************************************************************************* //