waveModel.H

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/*---------------------------------------------------------------------------*\
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  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
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    \\  /    A nd           | Copyright (C) 2017 OpenFOAM Foundation
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License
    This file is part of OpenFOAM.

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    the Free Software Foundation, either version 3 of the License, or
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Class
    Foam::waveModel

Description
    Generic base class for waves. Derived classes must implement field
    functions which return the elevation above the wave surface and the
    velocity field, both as a function of position.

SourceFiles
    waveModel.C

\*---------------------------------------------------------------------------*/

#ifndef waveModel_H
#define waveModel_H

#include "objectRegistry.H"
#include "dictionary.H"
#include "Function1.H"
#include "runTimeSelectionTables.H"
#include "vectorField.H"
#include "vector2DField.H"

// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

namespace Foam
{

/*---------------------------------------------------------------------------*\
                         Class waveModel Declaration
\*---------------------------------------------------------------------------*/

class waveModel
{
    // Private data

        //- Reference to the database
        const objectRegistry& db_;

        //- Peak-to-peak length [m]
        const scalar length_;

        //- Peak-to-mean amplitude [m]
        autoPtr<Function1<scalar>> amplitude_;

        //- Phase offset [rad]
        const scalar phase_;

        //- Depth [m]
        const scalar depth_;


protected:

    // Protected Member Functions

        //- The angular wavenumber [rad/m]
        scalar k() const;

        //- The intrinsic angular frequency [rad/s]
        scalar sigma() const;

        //- The observed angular frequency [rad/s]
        scalar omega(const scalar u) const;

        //- Angle of the oscillation [rad]
        tmp<scalarField> angle
        (
            const scalar t,
            const scalar u,
            const scalarField& x
        ) const;

        //- Return whether shallow effects are to be included
        bool shallow() const;


public:

    //- Runtime type information
    TypeName("waveModel");


    // Declare runtime construction
    declareRunTimeSelectionTable
    (
        autoPtr,
        waveModel,
        objectRegistry,
        (const objectRegistry& db, const dictionary& dict),
        (db, dict)
    );


    // Constructors

        //- Construct a copy
        waveModel(const waveModel& wave);

        //- Construct from a database and a dictionary
        waveModel(const objectRegistry& db, const dictionary& dict);

        //- Construct a clone
        virtual autoPtr<waveModel> clone() const = 0;


    // Selectors

        //- Select
        static autoPtr<waveModel> New
        (
            const objectRegistry& db,
            const dictionary& dict
        );

        //- Select
        static autoPtr<waveModel> New
        (
            const word& type,
            const objectRegistry& db,
            const dictionary& dict
        );


    //- Destructor
    virtual ~waveModel();


    // Member Functions

        // Access

            //- Get the length
            scalar length() const
            {
                return length_;
            }

            //- Get the amplitude
            scalar amplitude(const scalar t) const
            {
                return amplitude_->value(t);
            }

            //- Get the phase
            scalar phase() const
            {
                return phase_;
            }

            //- Get the depth
            scalar depth() const
            {
                return depth_;
            }

        //- Get the wave elevation at a given time, mean velocity and local
        //  coordinates. Local x is aligned with the mean velocity.
        virtual tmp<scalarField> elevation
        (
            const scalar t,
            const scalar u,
            const scalarField& x
        ) const = 0;

        //- Get the wave velocity at a given time, mean velocity and local
        //  coordinates. Local x is aligned with the mean velocity, and z with
        //  negative gravity.
        virtual tmp<vector2DField> velocity
        (
            const scalar t,
            const scalar u,
            const vector2DField& xz
        ) const = 0;

        //- Write
        virtual void write(Ostream& os) const;
};


// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

} // End namespace Foam

// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

#endif

// ************************************************************************* //