azizChen.C

Go to the documentation of this file.

/*---------------------------------------------------------------------------*\
  =========                 |
  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
   \\    /   O peration     | Website:  https://openfoam.org
    \\  /    A nd           | Copyright (C) 2011-2026 OpenFOAM Foundation
     \\/     M anipulation  |
-------------------------------------------------------------------------------
License
    This file is part of OpenFOAM.
 
    OpenFOAM is free software: you can redistribute it and/or modify it
    under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.
 
    OpenFOAM is distributed in the hope that it will be useful, but WITHOUT
    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
    FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
    for more details.
 
    You should have received a copy of the GNU General Public License
    along with OpenFOAM.  If not, see <http://www.gnu.org/licenses/>.
 
\*---------------------------------------------------------------------------*/
 
#include "azizChen.H"
#include "addToRunTimeSelectionTable.H"
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
namespace Foam
{
namespace pairPotentials
{
 
// * * * * * * * * * * * * * * Static Data Members * * * * * * * * * * * * * //
 
defineTypeNameAndDebug(azizChen, 0);
 
addToRunTimeSelectionTable
(
    pairPotential,
    azizChen,
    dictionary
);
 
 
// * * * * * * * * * * * * * * * * Constructors  * * * * * * * * * * * * * * //
 
azizChen::azizChen
(
    const word& name,
    const dictionary& azizChen
)
:
    pairPotential(name, azizChen),
    azizChenCoeffs_(azizChen.typeDict(typeName)),
    epsilon_(azizChenCoeffs_.template lookup<scalar>("epsilon")),
    rm_(azizChenCoeffs_.template lookup<scalar>("rm")),
    A_(azizChenCoeffs_.template lookup<scalar>("A")),
    alpha_(azizChenCoeffs_.template lookup<scalar>("alpha")),
    C6_(azizChenCoeffs_.template lookup<scalar>("C6")),
    C8_(azizChenCoeffs_.template lookup<scalar>("C8")),
    C10_(azizChenCoeffs_.template lookup<scalar>("C10")),
    D_(azizChenCoeffs_.template lookup<scalar>("D")),
    gamma_(azizChenCoeffs_.template lookup<scalar>("gamma"))
{
    setLookupTables();
}
 
 
// * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * * //
 
scalar azizChen::unscaledEnergy(const scalar r) const
{
    scalar x = r/rm_;
 
    scalar F = 1.0;
 
    if (x < D_)
    {
        F = exp(-pow(((D_ / x) - 1.0),2));
    }
 
    return
        epsilon_
       *(
            A_ * Foam::pow(x, gamma_)*exp(-alpha_*x)
          - (
                (C6_/ Foam::pow(x, 6))
              + (C8_/ Foam::pow(x, 8))
              + (C10_/ Foam::pow(x, 10))
            )
           *F
    );
}
 
 
bool azizChen::read(const dictionary& azizChen)
{
    pairPotential::read(azizChen);
 
    azizChenCoeffs_ = azizChen.typeDict(typeName);
 
    azizChenCoeffs_.lookup("epsilon") >> epsilon_;
    azizChenCoeffs_.lookup("rm") >> rm_;
    azizChenCoeffs_.lookup("A") >> A_;
    azizChenCoeffs_.lookup("alpha") >> alpha_;
    azizChenCoeffs_.lookup("C6") >> C6_;
    azizChenCoeffs_.lookup("C8") >> C8_;
    azizChenCoeffs_.lookup("C10") >> C10_;
    azizChenCoeffs_.lookup("D") >> D_;
    azizChenCoeffs_.lookup("gamma") >> gamma_;
 
    return true;
}
 
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
} // End namespace pairPotentials
} // End namespace Foam
 
// ************************************************************************* //