SIMPInterpolation.C

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/*---------------------------------------------------------------------------*\
  =========                 |
  \\      /  F ield         | OpenFOAM: The Open Interpolation CFD Toolbox
   \\    /   O peration     |
    \\  /    A nd           | www.openfoam.com
     \\/     M anipulation  |
-------------------------------------------------------------------------------
    Copyright (C) 2020-2023 PCOpt/NTUA
    Copyright (C) 2020-2023 FOSS GP
-------------------------------------------------------------------------------
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
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    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
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\*---------------------------------------------------------------------------*/
 
#include "SIMPInterpolation.H"
#include "addToRunTimeSelectionTable.H"
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
namespace Foam
{
    defineTypeNameAndDebug(SIMPInterpolation, 0);
    addToRunTimeSelectionTable
    (
        topOInterpolationFunction,
        SIMPInterpolation,
        dictionary
    );
}
 
 
// * * * * * * * * * * * * * * * * Constructors  * * * * * * * * * * * * * * //
 
Foam::SIMPInterpolation::SIMPInterpolation
(
    const fvMesh& mesh,
    const dictionary& dict
)
:
    topOInterpolationFunction(mesh, dict),
    b_(Function1<scalar>::New("b",dict))
{}
 
 
// * * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * //
 
void Foam::SIMPInterpolation::interpolate
(
    const scalarField& arg,
    scalarField& res
) const
{
    // Compute exponent
    const scalar time(mesh_.time().timeOutputValue());
    const scalar t(time == 0 ? 1. : time);
    const scalar b(b_->value(t));
 
    res = pow(arg, b);
}
 
 
Foam::tmp<Foam::scalarField>
Foam::SIMPInterpolation::derivative(const scalarField& arg) const
{
    tmp<scalarField> tderiv(tmp<scalarField>::New(arg.size(), Zero));
    scalarField& deriv = tderiv.ref();
 
    const scalar t(mesh_.time().timeOutputValue());
    const scalar b(b_->value(t));
 
    deriv = b*pow(arg, b - scalar(1));
 
    return tderiv;
}
 
 
// ************************************************************************* //