| /*---------------------------------------------------------------------------*\ | |
| ========= | | |
| \\ / F ield | OpenFOAM: The Open Source CFD Toolbox | |
| \\ / O peration | Website: https://openfoam.org | |
| \\ / A nd | Copyright (C) 2023-2026 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/>. | |
| Class | |
| Foam::JONSWAP | |
| Description | |
| JONSWAP wave spectrum. This is similar to the Pierson-Moskowitz spectrum, | |
| but with an additional empirical correction to account for the fetch | |
| (distance to the lee shore). | |
| References: | |
| \verbatim | |
| Hasselmann, K., Barnett, T. P., Bouws, E., Carlson, H., Cartwright, \\ | |
| D. E., Enke, K., ... & Walden, H. (1973). | |
| Measurements of wind-wave growth and swell decay during the Joint \\ | |
| North Sea Wave Project (JONSWAP). | |
| Ergaenzungsheft zur Deutschen Hydrographischen Zeitschrift, Reihe A. | |
| \endverbatim | |
| \verbatim | |
| Stewart, R. H. (2008). | |
| Introduction to physical oceanography. | |
| Robert H. Stewart. | |
| \endverbatim | |
| Usage | |
| \table | |
| Property | Description | Required? | Default | |
| U10 | The air speed 10 metres above the \\ | |
| surface [m/s] | yes | | |
| F | The fetch (distance from the lee \\ | |
| shore) [m] | yes | | |
| gamma | Peaked-ness parameter | no | 3.3 | |
| \endtable | |
| Example specification: | |
| \verbatim | |
| spectrum JONSWAP; | |
| JONSWAP | |
| { | |
| U10 10; | |
| F 200e3; | |
| } | |
| \endverbatim | |
| See also | |
| Foam::waveSpectra::PiersonMoskowitz | |
| SourceFiles | |
| JONSWAP.C | |
| \*---------------------------------------------------------------------------*/ | |
| // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * // | |
| namespace Foam | |
| { | |
| namespace waveSpectra | |
| { | |
| /*---------------------------------------------------------------------------*\ | |
| Class JONSWAP Declaration | |
| \*---------------------------------------------------------------------------*/ | |
| class JONSWAP | |
| : | |
| public waveSpectrum | |
| { | |
| // Private Data | |
| //- Reference velocity magnitude [m/s] | |
| const scalar U10_; | |
| //- Fetch (distance from the lee shore) [m] | |
| const scalar F_; | |
| //- Peaked-ness parameter | |
| const scalar gamma_; | |
| public: | |
| //- Runtime type information | |
| TypeName("JONSWAP"); | |
| // Constructors | |
| //- Construct a copy | |
| JONSWAP(const JONSWAP& spectrum); | |
| //- Construct from a dictionary and gravity | |
| JONSWAP(const dictionary& dict, const scalar g); | |
| //- Construct a clone | |
| virtual autoPtr<waveSpectrum> clone() const | |
| { | |
| return autoPtr<waveSpectrum>(new JONSWAP(*this)); | |
| } | |
| //- Destructor | |
| virtual ~JONSWAP(); | |
| // Member Functions | |
| //- Evaluate the wave spectral density at the given frequencies [m^2/Hz] | |
| virtual tmp<scalarField> S(const scalarField& f) const; | |
| //- Return the frequency below which a given fraction of the spectrum's | |
| // total energy falls [] | |
| virtual scalar fFraction(const scalar fraction) const; | |
| //- Write | |
| virtual void write(Ostream& os) const; | |
| }; | |
| // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * // | |
| } // End namespace waveSpectra | |
| } // End namespace Foam | |
| // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * // | |
| // ************************************************************************* // | |