OpenFOAM-dev / data /src /waves /waveModels /irregular /waveSpectra /PiersonMoskowitz /PiersonMoskowitz.C
| /*---------------------------------------------------------------------------*\ | |
| ========= | | |
| \\ / 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/>. | |
| \*---------------------------------------------------------------------------*/ | |
| 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_); | |
| } | |
| // ************************************************************************* // | |