HerschelBulkley.C

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#include "HerschelBulkley.H"
#include "incompressibleDriftFluxMixture.H"
#include "fvcGrad.H"
#include "addToRunTimeSelectionTable.H"
 
// * * * * * * * * * * * * * * Static Data Members * * * * * * * * * * * * * //
 
namespace Foam
{
namespace mixtureViscosityModels
{
    defineTypeNameAndDebug(HerschelBulkley, 0);
 
    addToRunTimeSelectionTable
    (
        mixtureViscosityModel,
        HerschelBulkley,
        dictionary
    );
}
}
 
 
// * * * * * * * * * * * * * * * * Constructors  * * * * * * * * * * * * * * //
 
Foam::mixtureViscosityModels::HerschelBulkley::HerschelBulkley
(
    const incompressibleDriftFluxMixture& mixture
)
:
    mixtureViscosityModel(mixture),
    n_("n", dimless, typeDict()),
    k_("k", dimDynamicViscosity*pow(dimTime, n_ - 1), typeDict()),
    tau0_("tau0", dimDynamicViscosity/dimTime, typeDict())
{}
 
 
// * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * * //
 
Foam::tmp<Foam::volScalarField>
Foam::mixtureViscosityModels::HerschelBulkley::mu
(
    const volScalarField& muc,
    const volVectorField& U
) const
{
    const volScalarField strainRate(sqrt(2.0)*mag(symm(fvc::grad(U))));
 
    return min
    (
        muc,
        (tau0_ + k_*pow(strainRate, n_))
       /max(strainRate, dimensionedScalar(dimless/dimTime, rootVSmall))
    );
}
 
 
bool Foam::mixtureViscosityModels::HerschelBulkley::read()
{
    if (mixtureViscosityModel::read())
    {
        const dictionary& dict = typeDict();
 
        n_.read(dict);
        k_.read(dict);
        tau0_.read(dict);
 
        return true;
    }
    else
    {
        return false;
    }
}
 
 
// ************************************************************************* //