/*---------------------------------------------------------------------------*\
  ==  == ====== ====   ====    |
                    \\     ||  | Multiphase Code Repository by HZDR
  ======   //   ||  || ===//   | Website: https://doi.org/10.14278/rodare.767
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-------------------------------------------------------------------------------
License
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    Website: https://hzdr.de

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#include "hyperbolic.H"
#include "addToRunTimeSelectionTable.H"

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

namespace Foam
{
namespace blendingMethods
{
    defineTypeNameAndDebug(hyperbolic, 0);
    addToRunTimeSelectionTable(blendingMethod, hyperbolic, dictionary);
}
}


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

Foam::tmp<Foam::volScalarField> Foam::blendingMethods::hyperbolic::fContinuous
(
    const UPtrList<const volScalarField>& alphas,
    const label phaseSet,
    const label systemSet
) const
{
    tmp<volScalarField> x = this->x(alphas, phaseSet, systemSet);
    tmp<volScalarField> a = parameter(alphas, phaseSet, minContinuousAlpha_);
    return (1 + tanh((4/transitionAlphaScale_.value)*(x - a)))/2;
}


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

Foam::blendingMethods::hyperbolic::hyperbolic
(
    const dictionary& dict,
    const phaseInterface& interface
)
:
    blendingMethod(dict, interface),
    minContinuousAlpha_
    (
        readParameters("minContinuousAlpha", dict, interface, {0, 1}, true)
    ),
    transitionAlphaScale_
    (
        readParameter("transitionAlphaScale", dict, {0, vGreat}, false)
    )
{
    if
    (
        canBeContinuous(0)
     && canBeContinuous(1)
     && minContinuousAlpha_[0].value + minContinuousAlpha_[1].value
      < 1 - rootSmall
    )
    {
        FatalErrorInFunction
            << typeName.capitalise() << " blending function for interface "
            << interface.name() << " is invalid in that it creates negative "
            << "coefficients for sub-modelled values. A valid function will "
            << "have minimum continuous alphas that sum one or greater."
            << exit(FatalError);
    }
}


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

Foam::blendingMethods::hyperbolic::~hyperbolic()
{}


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

bool Foam::blendingMethods::hyperbolic::canBeContinuous(const label index) const
{
    return minContinuousAlpha_[index].valid;
}


bool Foam::blendingMethods::hyperbolic::canSegregate() const
{
    return
        canBeContinuous(0)
     && canBeContinuous(1)
     && minContinuousAlpha_[0].value + minContinuousAlpha_[1].value
      > 1 + rootSmall;
}


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