harmonicSpring.C

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/*---------------------------------------------------------------------------*\
  =========                 |
  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
   \\    /   O peration     |
    \\  /    A nd           | Copyright (C) 2011 OpenFOAM Foundation
     \\/     M anipulation  |
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License
    This file is part of OpenFOAM.
 
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    FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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#include "harmonicSpring.H"
#include "addToRunTimeSelectionTable.H"
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
namespace Foam
{
namespace tetherPotentials
{
 
// * * * * * * * * * * * * * * Static Data Members * * * * * * * * * * * * * //
 
defineTypeNameAndDebug(harmonicSpring, 0);
 
addToRunTimeSelectionTable
(
    tetherPotential,
    harmonicSpring,
    dictionary
);
 
 
// * * * * * * * * * * * * * * * * Constructors  * * * * * * * * * * * * * * //
 
harmonicSpring::harmonicSpring
(
    const word& name,
    const dictionary& tetherPotentialProperties
)
:
    tetherPotential(name, tetherPotentialProperties),
    harmonicSpringCoeffs_
    (
        tetherPotentialProperties.subDict(typeName + "Coeffs")
    ),
    springConstant_(readScalar(harmonicSpringCoeffs_.lookup("springConstant")))
{}
 
 
// * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * * //
 
scalar harmonicSpring::energy(const vector r) const
{
    return 0.5*springConstant_*magSqr(r);
}
 
 
vector harmonicSpring::force(const vector r) const
{
    return -springConstant_*r;
}
 
 
bool harmonicSpring::read(const dictionary& tetherPotentialProperties)
{
    tetherPotential::read(tetherPotentialProperties);
 
    harmonicSpringCoeffs_ =
        tetherPotentialProperties.subDict(typeName + "Coeffs");
 
    harmonicSpringCoeffs_.lookup("springConstant") >> springConstant_;
 
    return true;
}
 
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
} // End namespace tetherPotentials
} // End namespace Foam
 
// ************************************************************************* //