meanVelocityForce.H

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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.
 
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    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::fv::meanVelocityForce
 
Description
    Calculates and applies the force necessary to maintain the specified mean
    velocity.
 
Usage
    Example usage:
    \verbatim
    meanVelocityConstraint
    {
        type            meanVelocityForce;
 
        select          all;
 
        U               U;          // Name of velocity field
 
        Ubar            (10.0 0 0); // Desired mean velocity
        relaxation      0.2;        // Optional relaxation factor
    }
    \endverbatim
 
    Note:
        Currently only handles kinematic pressure (incompressible solvers).
 
SourceFiles
    meanVelocityForce.C
 
\*---------------------------------------------------------------------------*/
 
#ifndef meanVelocityForce_H
#define meanVelocityForce_H
 
#include "fvConstraint.H"
#include "fvCellSet.H"
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
namespace Foam
{
namespace fv
{
 
/*---------------------------------------------------------------------------*\
                      Class meanVelocityForce Declaration
\*---------------------------------------------------------------------------*/
 
class meanVelocityForce
:
    public fvConstraint
{
    // Private data
 
        //- The set of cells the fvConstraint applies to
        fvCellSet set_;
 
        //- Name of the velocity field
        word UName_;
 
        //- Average velocity
        vector Ubar_;
 
        //- Relaxation factor
        scalar relaxation_;
 
        //- Pressure gradient before correction
        mutable scalar gradP0_;
 
        //- Change in pressure gradient
        mutable scalar dGradP_;
 
        //- Matrix 1/A coefficients field pointer
        mutable autoPtr<volScalarField> rAPtr_;
 
 
    // Private Member Functions
 
        //- Non-virtual read
        void readCoeffs();
 
        //- Calculate and return the magnitude of the mean velocity
        //  averaged over the selected cellSet
        virtual scalar magUbarAve(const volVectorField& U) const;
 
        //- Write the pressure gradient to file (for restarts etc)
        void writeProps(const scalar gradP) const;
 
        //- Correct driving force for a constant mass flow rate
        void update(fvMatrix<vector>& eqn) const;
 
 
public:
 
    //- Runtime type information
    TypeName("meanVelocityForce");
 
 
    // Constructors
 
        //- Construct from explicit source name and mesh
        meanVelocityForce
        (
            const word& sourceName,
            const word& modelType,
            const fvMesh& mesh,
            const dictionary& dict
        );
 
        //- Disallow default bitwise copy construction
        meanVelocityForce(const meanVelocityForce&) = delete;
 
 
    // Member Functions
 
        //- Return the average velocity
        const vector& Ubar() const
        {
            return Ubar_;
        }
 
        //- Return the list of fields constrained by the fvConstraint
        virtual wordList constrainedFields() const;
 
        //- Add the momentum source and set the 1/A coefficient
        virtual bool constrain
        (
            fvMatrix<vector>& eqn,
            const word& fieldName
        ) const;
 
        //- Correct the pressure gradient
        virtual bool constrain(volVectorField& U) const;
 
        //- Update for mesh motion
        virtual bool movePoints();
 
        //- Update topology using the given map
        virtual void topoChange(const polyTopoChangeMap&);
 
        //- Update from another mesh using the given map
        virtual void mapMesh(const polyMeshMap&);
 
        //- Redistribute or update using the given distribution map
        virtual void distribute(const polyDistributionMap&);
 
        //- Read source dictionary
        virtual bool read(const dictionary& dict);
 
 
    // Member Operators
 
        //- Disallow default bitwise assignment
        void operator=(const meanVelocityForce&) = delete;
};
 
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
} // End namespace fv
} // End namespace Foam
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
#endif
 
// ************************************************************************* //