harmonicSpring.C

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/*---------------------------------------------------------------------------*\
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    Copyright (C) 2011 OpenFOAM Foundation
-------------------------------------------------------------------------------
License
    This file is part of OpenFOAM.

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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_(harmonicSpringCoeffs_.get<scalar>("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_.readEntry("springConstant", springConstant_);

    return true;
}


// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

} // End namespace tetherPotentials
} // End namespace Foam

// ************************************************************************* //