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#include "JohnsonJacksonFrictionalStress.H"
#include "addToRunTimeSelectionTable.H"
#include "mathematicalConstants.H"

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

namespace Foam
{
namespace kineticTheoryModels
{
namespace frictionalStressModels
{
    defineTypeNameAndDebug(JohnsonJackson, 0);

    addToRunTimeSelectionTable
    (
        frictionalStressModel,
        JohnsonJackson,
        dictionary
    );
}
}
}


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

bool Foam::kineticTheoryModels::frictionalStressModels::JohnsonJackson::
readCoeffs
(
    const dictionary& coeffDict
)
{
    Fr_.read(coeffDict);
    eta_.read(coeffDict);
    p_.read(coeffDict);

    phi_.read(coeffDict);
    phi_ *= constant::mathematical::pi/180.0;

    alphaDeltaMin_.read(coeffDict);

    return true;
}


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

Foam::kineticTheoryModels::frictionalStressModels::JohnsonJackson::
JohnsonJackson
(
    const dictionary& coeffDict
)
:
    frictionalStressModel(coeffDict),
    Fr_("Fr", dimensionSet(1, -1, -2, 0, 0), coeffDict),
    eta_("eta", dimless, coeffDict),
    p_("p", dimless, coeffDict),
    phi_("phi", dimless, coeffDict),
    alphaDeltaMin_("alphaDeltaMin", dimless, coeffDict)
{
    phi_ *= constant::mathematical::pi/180.0;
}


// * * * * * * * * * * * * * * * * Destructor  * * * * * * * * * * * * * * * //

Foam::kineticTheoryModels::frictionalStressModels::JohnsonJackson::
~JohnsonJackson()
{}


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

Foam::tmp<Foam::volScalarField>
Foam::kineticTheoryModels::frictionalStressModels::JohnsonJackson::
frictionalPressure
(
    const phaseModel& phase,
    const dimensionedScalar& alphaMinFriction,
    const dimensionedScalar& alphaMax
) const
{
    const volScalarField& alpha = phase;

    return
        Fr_*pow(max(alpha - alphaMinFriction, scalar(0)), eta_)
       /pow(max(alphaMax - alpha, alphaDeltaMin_), p_);
}


Foam::tmp<Foam::volScalarField>
Foam::kineticTheoryModels::frictionalStressModels::JohnsonJackson::
frictionalPressurePrime
(
    const phaseModel& phase,
    const dimensionedScalar& alphaMinFriction,
    const dimensionedScalar& alphaMax
) const
{
    const volScalarField& alpha = phase;

    return Fr_*
    (
        eta_*pow(max(alpha - alphaMinFriction, scalar(0)), eta_ - 1)
       *(alphaMax - alpha)
      + p_*pow(max(alpha - alphaMinFriction, scalar(0)), eta_)
    )/pow(max(alphaMax - alpha, alphaDeltaMin_), p_ + 1);
}


Foam::tmp<Foam::volScalarField>
Foam::kineticTheoryModels::frictionalStressModels::JohnsonJackson::nu
(
    const phaseModel& phase,
    const dimensionedScalar& alphaMinFriction,
    const dimensionedScalar& alphaMax,
    const volScalarField& pf,
    const volSymmTensorField& D
) const
{
    return volScalarField::New
    (
        IOobject::groupName
        (
            Foam::typedName<frictionalStressModel>("nu"),
            phase.group()
        ),
        dimensionedScalar(dimTime, 0.5)*pf*sin(phi_)
    );
}


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