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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 "PiersonMoskowitz.H"
#include "mathematicalConstants.H"
#include "addToRunTimeSelectionTable.H"
using namespace Foam::constant::mathematical;
// * * * * * * * * * * * * * * Static Data Members * * * * * * * * * * * * * //
namespace Foam
{
namespace waveSpectra
{
defineTypeNameAndDebug(PiersonMoskowitz, 0);
addToRunTimeSelectionTable(waveSpectrum, PiersonMoskowitz, dictionary);
}
}
// * * * * * * * * * * * * * * * * Constructors * * * * * * * * * * * * * * //
Foam::waveSpectra::PiersonMoskowitz::PiersonMoskowitz
(
const PiersonMoskowitz& spectrum
)
:
waveSpectrum(spectrum),
U19_5_(spectrum.U19_5_),
alpha_(spectrum.alpha_),
beta_(spectrum.beta_)
{}
Foam::waveSpectra::PiersonMoskowitz::PiersonMoskowitz
(
const dictionary& dict,
const scalar g
)
:
waveSpectrum(dict, g),
U19_5_(dict.lookup<scalar>("U19_5")),
alpha_(dict.lookupOrDefault<scalar>("alpha", 8.1e-3)),
beta_(dict.lookupOrDefault<scalar>("beta", 0.74))
{}
// * * * * * * * * * * * * * * * * Destructor * * * * * * * * * * * * * * * //
Foam::waveSpectra::PiersonMoskowitz::~PiersonMoskowitz()
{}
// * * * * * * * * * * * * * * Member Functions * * * * * * * * * * * * * * //
Foam::tmp<Foam::scalarField> Foam::waveSpectra::PiersonMoskowitz::S
(
const scalarField& f
) const
{
const scalarField w(twoPi*f);
const scalar w0 = g()/U19_5_;
return twoPi*alpha_*sqr(g())/pow5(w)*exp(- beta_*pow4(w0/w));
}
Foam::tmp<Foam::scalarField> Foam::waveSpectra::PiersonMoskowitz::integralS
(
const scalarField& f
) const
{
const scalarField w(twoPi*f);
const scalar w0 = g()/U19_5_;
const scalar integralSInf = twoPi*alpha_*sqr(g())/(4*beta_*pow4(w0))/twoPi;
return integralSInf*exp(- beta_*pow4(w0/w));
}
Foam::scalar Foam::waveSpectra::PiersonMoskowitz::fFraction
(
const scalar fraction
) const
{
const scalar w0 = g()/U19_5_;
return w0/pow025(- log(fraction)/beta_)/twoPi;
}
void Foam::waveSpectra::PiersonMoskowitz::write(Ostream& os) const
{
waveSpectrum::write(os);
writeEntry(os, "U19_5", U19_5_);
writeEntryIfDifferent<scalar>(os, "alpha", 8.1e-3, alpha_);
writeEntryIfDifferent<scalar>(os, "beta", 0.74, beta_);
}
// ************************************************************************* //
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