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========= |
\\ / F ield | OpenFOAM: The Open Source CFD Toolbox
\\ / O peration | Website: https://openfoam.org
\\ / A nd | Copyright (C) 2023 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 "JONSWAP.H"
#include "mathematicalConstants.H"
#include "addToRunTimeSelectionTable.H"
using namespace Foam::constant::mathematical;
// * * * * * * * * * * * * * * Static Data Members * * * * * * * * * * * * * //
namespace Foam
{
namespace waveSpectra
{
defineTypeNameAndDebug(JONSWAP, 0);
addToRunTimeSelectionTable(waveSpectrum, JONSWAP, dictionary);
}
}
// * * * * * * * * * * * * * * * * Constructors * * * * * * * * * * * * * * //
Foam::waveSpectra::JONSWAP::JONSWAP
(
const JONSWAP& spectrum
)
:
waveSpectrum(spectrum),
U10_(spectrum.U10_),
F_(spectrum.F_),
gamma_(spectrum.gamma_)
{}
Foam::waveSpectra::JONSWAP::JONSWAP
(
const dictionary& dict,
const scalar g
)
:
waveSpectrum(dict, g),
U10_(dict.lookup<scalar>("U10")),
F_(dict.lookup<scalar>("F")),
gamma_(dict.lookupOrDefault<scalar>("gamma", 3.3))
{}
// * * * * * * * * * * * * * * * * Destructor * * * * * * * * * * * * * * * //
Foam::waveSpectra::JONSWAP::~JONSWAP()
{}
// * * * * * * * * * * * * * * Member Functions * * * * * * * * * * * * * * //
Foam::tmp<Foam::scalarField> Foam::waveSpectra::JONSWAP::S
(
const scalarField& f
) const
{
const scalar alpha = 0.076*pow(sqr(U10_)/(F_*g()), 0.22);
const scalarField w(twoPi*f);
const scalar wp = 22*pow(sqr(g())/(U10_*F_), 1.0/3.0);
const scalarField sigma(0.07 + 0.02*pos(w - wp));
const scalarField r(exp(- sqr(w - wp)/(2*sqr(sigma)*sqr(wp))));
return twoPi*alpha*sqr(g())/pow5(w)*exp(- 1.2*pow4(wp/w))*pow(gamma_, r);
}
Foam::scalar Foam::waveSpectra::JONSWAP::fFraction(const scalar fraction) const
{
const scalar wp = 22*pow(sqr(g())/(U10_*F_), 1.0/3.0);
const scalar f1 = wp/pow025(rootSmall/1.2)/twoPi;
return waveSpectrum::fFraction(fraction, f1);
}
void Foam::waveSpectra::JONSWAP::write(Ostream& os) const
{
waveSpectrum::write(os);
writeEntry(os, "U10", U10_);
writeEntry(os, "F", F_);
writeEntryIfDifferent(os, "gamma", scalar(3.3), gamma_);
}
// ************************************************************************* //
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