SRFFreestreamVelocityFvPatchVectorField.H

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    Copyright (C) 2015 OpenCFD Ltd.
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Class
    Foam::SRFFreestreamVelocityFvPatchVectorField

Description
    Freestream velocity condition to be used in conjunction with the single
    rotating frame (SRF) model (see: SRFModel class)

    Given the free stream velocity in the absolute frame, the condition
    applies the appropriate rotation transformation in time and space to
    determine the local velocity using:

    \f[
        U_p = cos(\theta) U_{Inf} + sin(\theta) (n \times U_{Inf}) - U_{p,srf}
    \f]

    where
    \vartable
        U_p     | patch velocity [m/s]
        U_{Inf} | free stream velocity in the absolute frame [m/s]
        \theta  | swept angle [rad]
        n       | axis direction of the SRF
        U_{p,srf} | SRF velocity of the patch [m/s]
    \endvartable


Usage
    \table
        Property        | Description               | Required | Default value
        UInf            | freestream velocity       | yes      |
        relative        | UInf relative to the SRF? | no       |
    \endtable

    Example of the boundary condition specification:
    \verbatim
    <patchName>
    {
        type            SRFFreestreamVelocity;
        UInf            uniform (0 0 0);
        relative        no;
        value           uniform (0 0 0);    // initial value
    }
    \endverbatim

See also
    Foam::freestreamFvPatchField
    Foam::SRFVelocityFvPatchVectorField

SourceFiles
    SRFFreestreamVelocityFvPatchVectorField.C

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

#ifndef SRFFreestreamVelocityFvPatchVectorField_H
#define SRFFreestreamVelocityFvPatchVectorField_H

#include "inletOutletFvPatchFields.H"
#include "Switch.H"

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

namespace Foam
{

/*---------------------------------------------------------------------------*\
           Class SRFFreestreamVelocityFvPatchVectorField Declaration
\*---------------------------------------------------------------------------*/

class SRFFreestreamVelocityFvPatchVectorField
:
    public inletOutletFvPatchVectorField
{
    // Private data

        //- Is the supplied inlet value relative to the SRF
        Switch relative_;

        //- Velocity of the free stream in the absolute frame [m/s]
        vector UInf_;


public:

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


    // Constructors

        //- Construct from patch and internal field
        SRFFreestreamVelocityFvPatchVectorField
        (
            const fvPatch&,
            const DimensionedField<vector, volMesh>&
        );

        //- Construct from patch, internal field and dictionary
        SRFFreestreamVelocityFvPatchVectorField
        (
            const fvPatch&,
            const DimensionedField<vector, volMesh>&,
            const dictionary&
        );

        //- Construct by mapping given SRFFreestreamVelocityFvPatchVectorField
        //  onto a new patch
        SRFFreestreamVelocityFvPatchVectorField
        (
            const SRFFreestreamVelocityFvPatchVectorField&,
            const fvPatch&,
            const DimensionedField<vector, volMesh>&,
            const fvPatchFieldMapper&
        );

        //- Construct as copy
        SRFFreestreamVelocityFvPatchVectorField
        (
            const SRFFreestreamVelocityFvPatchVectorField&
        );

        //- Construct as copy setting internal field reference
        SRFFreestreamVelocityFvPatchVectorField
        (
            const SRFFreestreamVelocityFvPatchVectorField&,
            const DimensionedField<vector, volMesh>&
        );

        //- Return a clone
        virtual tmp<fvPatchField<vector>> clone() const
        {
            return fvPatchField<vector>::Clone(*this);
        }

        //- Clone with an internal field reference
        virtual tmp<fvPatchField<vector>> clone
        (
            const DimensionedField<vector, volMesh>& iF
        ) const
        {
            return fvPatchField<vector>::Clone(*this, iF);
        }


    // Member functions

        // Access

            //- Return the velocity at infinity
            const vector& UInf() const
            {
                return UInf_;
            }

            //- Return reference to the velocity at infinity to allow adjustment
            vector& UInf()
            {
                return UInf_;
            }


        // Evaluation functions

            //- Update the coefficients associated with the patch field
            virtual void updateCoeffs();


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


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

} // End namespace Foam

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

#endif

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