strainRateFunction.C

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    Copyright (C) 2020 OpenCFD Ltd.
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#include "strainRateFunction.H"
#include "volFields.H"
#include "addToRunTimeSelectionTable.H"
 
// * * * * * * * * * * * * * * Static Data Members * * * * * * * * * * * * * //
 
namespace Foam
{
namespace laminarModels
{
namespace generalizedNewtonianViscosityModels
{
    defineTypeNameAndDebug(strainRateFunction, 0);
 
    addToRunTimeSelectionTable
    (
        generalizedNewtonianViscosityModel,
        strainRateFunction,
        dictionary
    );
}
}
}
 
 
// * * * * * * * * * * * * * * * * Constructors  * * * * * * * * * * * * * * //
 
Foam::laminarModels::generalizedNewtonianViscosityModels::strainRateFunction::
strainRateFunction
(
    const dictionary& viscosityProperties
)
:
    generalizedNewtonianViscosityModel(viscosityProperties),
    strainRateFunctionCoeffs_
    (
        viscosityProperties.optionalSubDict(typeName + "Coeffs")
    ),
    strainRateFunction_
    (
        Function1<scalar>::New("function", strainRateFunctionCoeffs_)
    )
{}
 
 
// * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * * //
 
bool Foam::laminarModels::generalizedNewtonianViscosityModels::
strainRateFunction::read
(
    const dictionary& viscosityProperties
)
{
    generalizedNewtonianViscosityModel::read(viscosityProperties);
 
    strainRateFunctionCoeffs_ =
        viscosityProperties.optionalSubDict(typeName + "Coeffs");
 
    strainRateFunction_.reset();
    strainRateFunction_ = Function1<scalar>::New
    (
        "function",
        strainRateFunctionCoeffs_
    );
 
    return true;
}
 
 
Foam::tmp<Foam::volScalarField>
Foam::laminarModels::generalizedNewtonianViscosityModels::strainRateFunction::
nu
(
    const volScalarField& nu0,
    const volScalarField& strainRate
) const
{
    auto tnu = volScalarField::New
    (
        IOobject::scopedName(type(), IOobject::groupName("nu", nu0.group())),
        nu0.mesh(),
        dimensionedScalar(dimViscosity, Zero)
    );
 
    // Set the database - could not be done in constructor
    const_cast<Function1<scalar>&>(strainRateFunction_()).resetDb
    (
        nu0.mesh().thisDb()
    );
 
    tnu.ref().primitiveFieldRef() = strainRateFunction_->value(strainRate);
 
    volScalarField::Boundary& nuBf = tnu.ref().boundaryFieldRef();
    const volScalarField::Boundary& sigmaBf = strainRate.boundaryField();
 
    forAll(nuBf, patchi)
    {
        nuBf[patchi] = strainRateFunction_->value(sigmaBf[patchi]);
    }
 
    return tnu;
}
 
 
// ************************************************************************* //