exponential.C

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    Copyright (C) 2013-2016 OpenFOAM Foundation
-------------------------------------------------------------------------------
License
    This file is part of OpenFOAM.
 
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    under the terms of the GNU General Public License as published by
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    FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
    for more details.
 
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#include "exponential.H"
#include "addToRunTimeSelectionTable.H"
 
// * * * * * * * * * * * * * * Static Data Members * * * * * * * * * * * * * //
 
namespace Foam
{
namespace ParticleStressModels
{
    defineTypeNameAndDebug(exponential, 0);
 
    addToRunTimeSelectionTable
    (
        ParticleStressModel,
        exponential,
        dictionary
    );
}
}
 
 
// * * * * * * * * * * * * * * * * Constructors  * * * * * * * * * * * * * * //
 
Foam::ParticleStressModels::exponential::exponential
(
    const dictionary& dict
)
:
    ParticleStressModel(dict),
    preExp_(dict.get<scalar>("preExp")),
    expMax_(dict.get<scalar>("expMax")),
    g0_(dict.get<scalar>("g0"))
{}
 
 
Foam::ParticleStressModels::exponential::exponential
(
    const exponential& hc
)
:
    ParticleStressModel(hc),
    preExp_(hc.preExp_),
    expMax_(hc.expMax_),
    g0_(hc.g0_)
{}
 
 
// * * * * * * * * * * * * * * * * Destructor  * * * * * * * * * * * * * * * //
 
Foam::ParticleStressModels::exponential::~exponential()
{}
 
 
// * * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * //
 
Foam::tmp<Foam::Field<Foam::scalar>>
Foam::ParticleStressModels::exponential::tau
(
    const Field<scalar>& alpha,
    const Field<scalar>& rho,
    const Field<scalar>& uSqr
) const
{
    return dTaudTheta(alpha, rho, uSqr)/preExp_;
}
 
 
Foam::tmp<Foam::Field<Foam::scalar>>
Foam::ParticleStressModels::exponential::dTaudTheta
(
    const Field<scalar>& alpha,
    const Field<scalar>& rho,
    const Field<scalar>& uSqr
) const
{
    return
        g0_
       *min
        (
            exp(preExp_*(alpha - alphaPacked_)),
            expMax_
        );
}
 
 
// ************************************************************************* //