sigmoid.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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#include "sigmoid.H"
#include "addToRunTimeSelectionTable.H"
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
namespace Foam
{
namespace energyScalingFunctions
{
 
// * * * * * * * * * * * * * * Static Data Members * * * * * * * * * * * * * //
 
defineTypeNameAndDebug(sigmoid, 0);
 
addToRunTimeSelectionTable
(
    energyScalingFunction,
    sigmoid,
    dictionary
);
 
 
// * * * * * * * * * * * * Private Member Functions  * * * * * * * * * * * * //
 
scalar sigmoid::sigmoidScale
    (
        const scalar r,
        const scalar shift,
        const scalar scale
    ) const
{
    return 1.0 / (1.0 + exp( scale * (r - shift)));
}
 
 
// * * * * * * * * * * * * * * * * Constructors  * * * * * * * * * * * * * * //
 
sigmoid::sigmoid
(
    const word& name,
    const dictionary& energyScalingFunctionProperties,
    const pairPotential& pairPot
)
:
    energyScalingFunction(name, energyScalingFunctionProperties, pairPot),
    sigmoidCoeffs_
    (
        energyScalingFunctionProperties.subDict(typeName + "Coeffs")
    ),
    shift_(readScalar(sigmoidCoeffs_.lookup("shift"))),
    scale_(readScalar(sigmoidCoeffs_.lookup("scale")))
{}
 
 
// * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * * //
 
void sigmoid::scaleEnergy(scalar& e, const scalar r) const
{
    e *= sigmoidScale(r, shift_, scale_);
}
 
 
bool sigmoid::read(const dictionary& energyScalingFunctionProperties)
{
    energyScalingFunction::read(energyScalingFunctionProperties);
 
    sigmoidCoeffs_ =
        energyScalingFunctionProperties.subDict(typeName + "Coeffs");
 
    sigmoidCoeffs_.lookup("shift") >> shift_;
    sigmoidCoeffs_.lookup("scale") >> shift_;
 
    return true;
}
 
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
} // End namespace energyScalingFunctions
} // End namespace Foam
 
// ************************************************************************* //