/
restrainedHarmonicSpring.C
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/
restrainedHarmonicSpring.C
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/*---------------------------------------------------------------------------*\
========= |
\\ / F ield | OpenFOAM: The Open Source CFD Toolbox
\\ / O peration |
\\ / A nd | Copyright (C) 2011 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 "restrainedHarmonicSpring.H"
#include "addToRunTimeSelectionTable.H"
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
namespace Foam
{
namespace tetherPotentials
{
// * * * * * * * * * * * * * * Static Data Members * * * * * * * * * * * * * //
defineTypeNameAndDebug(restrainedHarmonicSpring, 0);
addToRunTimeSelectionTable
(
tetherPotential,
restrainedHarmonicSpring,
dictionary
);
// * * * * * * * * * * * * * * * * Constructors * * * * * * * * * * * * * * //
restrainedHarmonicSpring::restrainedHarmonicSpring
(
const word& name,
const dictionary& tetherPotentialProperties
)
:
tetherPotential(name, tetherPotentialProperties),
restrainedHarmonicSpringCoeffs_
(
tetherPotentialProperties.subDict(typeName + "Coeffs")
),
springConstant_
(
readScalar(restrainedHarmonicSpringCoeffs_.lookup("springConstant"))
),
rR_
(
readScalar(restrainedHarmonicSpringCoeffs_.lookup("rR"))
)
{}
// * * * * * * * * * * * * * * Member Functions * * * * * * * * * * * * * * //
scalar restrainedHarmonicSpring::energy(const vector r) const
{
scalar magR = mag(r);
if (magR < rR_)
{
return 0.5 * springConstant_ * magSqr(r);
}
else
{
return 0.5 * springConstant_ * rR_ * rR_
+ springConstant_ * rR_ * (magR - rR_);
}
}
vector restrainedHarmonicSpring::force(const vector r) const
{
scalar magR = mag(r);
if (magR < rR_)
{
return -springConstant_ * r;
}
else
{
return -springConstant_ * rR_ * r / magR;
}
}
bool restrainedHarmonicSpring::read
(
const dictionary& tetherPotentialProperties
)
{
tetherPotential::read(tetherPotentialProperties);
restrainedHarmonicSpringCoeffs_ =
tetherPotentialProperties.subDict(typeName + "Coeffs");
restrainedHarmonicSpringCoeffs_.lookup("springConstant") >> springConstant_;
restrainedHarmonicSpringCoeffs_.lookup("rR") >> rR_;
return true;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
} // End namespace tetherPotentials
} // End namespace Foam
// ************************************************************************* //