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========= |
\\ / 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
\*---------------------------------------------------------------------------*/
#ifndef JONSWAP_H
#define JONSWAP_H
#include "waveSpectrum.H"
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
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
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
#endif
// ************************************************************************* //
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