GodaJONSWAP.H

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License
    This file is part of OpenFOAM.
 
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Class
    Foam::GodaJONSWAP
 
Description
    GodaJONSWAP wave spectrum. This is an alternative, approximate
    parameterisation of the JONSWAP spectrum, in which the significant wave
    height and period are specified instead of the wind speed and fetch.
 
    References:
    \verbatim
        Goda, Y. (1988).
        Statistical variability of sea state parameters as a function of wave
        spectrum.
        Coastal Engineering in Japan, 31(1), 39-52.
    \endverbatim
 
    \verbatim
        Goda, Y. (2010).
        Random seas and design of maritime structures.
        World Scientific Publishing Company.
    \endverbatim
 
    See page 29 of the second reference for a convenient formulation.
 
Usage
    \table
        Property | Description                             | Required? | Default
        Hs       | The significant wave height [m]         | yes       |
        Tp       | The significant wave period [s]         | yes       |
        gamma    | Peaked-ness parameter                   | no        | 3.3
    \endtable
 
    Example specification:
    \verbatim
    spectrum    GodaJONSWAP;
 
    GodaJONSWAPCoeffs
    {
        Hs          2;
        Ts          6;
    }
    \endverbatim
 
See also
    Foam::waveSpectra::JONSWAP
 
SourceFiles
    GodaJONSWAP.C
 
\*---------------------------------------------------------------------------*/
 
#ifndef GodaJONSWAP_H
#define GodaJONSWAP_H
 
#include "waveSpectrum.H"
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
namespace Foam
{
namespace waveSpectra
{
 
/*---------------------------------------------------------------------------*\
                          Class GodaJONSWAP Declaration
\*---------------------------------------------------------------------------*/
 
class GodaJONSWAP
:
    public waveSpectrum
{
    // Private Data
 
        //- Significant Wave Height [m]
        const scalar Hs_;
 
        //- Significant wave period [s]
        const scalar Ts_;
 
        //- Peaked-ness parameter
        const scalar gamma_;
 
 
public:
 
    //- Runtime type information
    TypeName("GodaJONSWAP");
 
 
    // Constructors
 
        //- Construct a copy
        GodaJONSWAP(const GodaJONSWAP& spectrum);
 
        //- Construct from a dictionary and gravity
        GodaJONSWAP(const dictionary& dict, const scalar g);
 
        //- Construct a clone
        virtual autoPtr<waveSpectrum> clone() const
        {
            return autoPtr<waveSpectrum>(new GodaJONSWAP(*this));
        }
 
 
    //- Destructor
    virtual ~GodaJONSWAP();
 
 
    // 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
 
// ************************************************************************* //