variableHeightFlowRateInletVelocityFvPatchVectorField.H

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Class
    Foam::variableHeightFlowRateInletVelocityFvPatchVectorField
 
Group
    grpInletBoundaryConditions
 
Description
    This boundary condition provides a velocity boundary condition for
    multphase flow based on a user-specified volumetric flow rate.
 
    The flow rate is made proportional to the phase fraction alpha at each
    face of the patch and alpha is ensured to be bound between 0 and 1.
 
    \heading Patch usage
 
    \table
        Property     | Description             | Required    | Default value
        flowRate     | volumetric flow rate [m3/s] | yes |
        alpha        | phase-fraction field    | yes |
    \endtable
 
    Example of the boundary condition specification:
    \verbatim
    myPatch
    {
        type            variableHeightFlowRateInletVelocity;
        flowRate        0.2;
        alpha           alpha.water;
        value           uniform (0 0 0); // placeholder
    }
    \endverbatim
 
Note
    - the value is positive into the domain
    - may not work correctly for transonic inlets
    - strange behaviour with potentialFoam since the momentum equation is
      not solved
 
SeeAlso
    Foam::fixedValueFvPatchField
 
SourceFiles
    variableHeightFlowRateInletVelocityFvPatchVectorField.C
 
\*---------------------------------------------------------------------------*/
 
#ifndef variableHeightFlowRateInletVelocityFvPatchVectorField_H
#define variableHeightFlowRateInletVelocityFvPatchVectorField_H
 
#include "fixedValueFvPatchFields.H"
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
namespace Foam
{
/*---------------------------------------------------------------------------*\
    Class variableHeightFlowRateInletVelocityFvPatchVectorField Declaration
\*---------------------------------------------------------------------------*/
 
class variableHeightFlowRateInletVelocityFvPatchVectorField
:
    public fixedValueFvPatchVectorField
{
    // Private data
 
        //- Inlet integral flow rate
        scalar flowRate_;
 
        //- Name of the phase-fraction field
        word alphaName_;
 
 
public:
 
   //- Runtime type information
   TypeName("variableHeightFlowRateInletVelocity");
 
 
   // Constructors
 
        //- Construct from patch and internal field
        variableHeightFlowRateInletVelocityFvPatchVectorField
        (
            const fvPatch&,
            const DimensionedField<vector, volMesh>&
        );
 
        //- Construct from patch, internal field and dictionary
        variableHeightFlowRateInletVelocityFvPatchVectorField
        (
            const fvPatch&,
            const DimensionedField<vector, volMesh>&,
            const dictionary&
        );
 
        //- Construct by mapping given
        //  variableHeightFlowRateInletVelocityFvPatchVectorField
        //  onto a new patch
        variableHeightFlowRateInletVelocityFvPatchVectorField
        (
            const variableHeightFlowRateInletVelocityFvPatchVectorField&,
            const fvPatch&,
            const DimensionedField<vector, volMesh>&,
            const fvPatchFieldMapper&
        );
 
        //- Construct as copy
        variableHeightFlowRateInletVelocityFvPatchVectorField
        (
            const variableHeightFlowRateInletVelocityFvPatchVectorField&
        );
 
        //- Construct and return a clone
        virtual tmp<fvPatchVectorField> clone() const
        {
            return tmp<fvPatchVectorField>
            (
                new variableHeightFlowRateInletVelocityFvPatchVectorField(*this)
            );
        }
 
        //- Construct as copy setting internal field reference
        variableHeightFlowRateInletVelocityFvPatchVectorField
        (
            const variableHeightFlowRateInletVelocityFvPatchVectorField&,
            const DimensionedField<vector, volMesh>&
        );
 
        //- Construct and return a clone setting internal field reference
        virtual tmp<fvPatchVectorField> clone
        (
            const DimensionedField<vector, volMesh>& iF
        ) const
        {
            return tmp<fvPatchVectorField>
            (
                new variableHeightFlowRateInletVelocityFvPatchVectorField
                (
                    *this,
                    iF
                )
            );
        }
 
 
    // Member functions
 
        // Access
 
            //- Return the flux
            scalar flowRate() const
            {
                return flowRate_;
            }
 
            //- Return reference to the flux to allow adjustment
            scalar& flowRate()
            {
                return flowRate_;
            }
 
 
        //- Update the coefficients associated with the patch field
        virtual void updateCoeffs();
 
        //- Write
        virtual void write(Ostream&) const;
};
 
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
} // End namespace Foam
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
#endif
 
// ************************************************************************* //