derivedFields.H

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/*---------------------------------------------------------------------------*\
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-------------------------------------------------------------------------------
    Copyright (C) 2019-2020 OpenCFD Ltd.
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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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    FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
    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::functionObjects::derivedFields
 
Group
    grpFieldFunctionObjects
 
Description
    Computes two predefined derived fields, i.e. \c rhoU, and \c pTotal, where
    the defined fields are hard-coded as follows:
 
    \vartable
      rhoU              | \f$ \rho \vec U \f$
      pTotal            | \f$ p + 1/2 \rho \, mag(\vec U)^2 \f$
    \endvartable
 
    Operands:
    \table
      Operand       | Type                    | Location
      input         | vol{Scalar,Vector}Field | <time>/inputField
      output file   | -                       | -
      output field  | vol{Scalar,Vector}Field | <time>/outputField
    \endtable
 
Usage
    Minimal example by using \c system/controlDict.functions:
    \verbatim
    derivedFieldsFO
    {
        // Mandatory entries
        type            derivedFields;
        libs            (fieldFunctionObjects);
        derived         (rhoU pTotal);
 
        // Optional entries
        rhoRef          <scalar>;
 
        // Inherited entries
        ...
    }
    \endverbatim
 
    where the entries mean:
    \table
      Property     | Description                           | Type | Reqd | Deflt
      type         | Type name: derivedFields              | word |  yes  | -
      libs         | Library name: fieldFunctionObjects    | word |  yes  | -
      derived      | Names of operand fields (rhoU/pTotal) | word |  yes  | -
      rhoRef  | Reference density for incompressible flows | scalar | no  | 1.0
    \endtable
 
    The inherited entries are elaborated in:
      - \link functionObject.H \endlink
 
SourceFiles
    derivedFields.C
 
\*---------------------------------------------------------------------------*/
 
#ifndef Foam_functionObjects_derivedFields_H
#define Foam_functionObjects_derivedFields_H
 
#include "fvMeshFunctionObject.H"
#include "Enum.H"
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
namespace Foam
{
namespace functionObjects
{
 
/*---------------------------------------------------------------------------*\
                        Class derivedFields Declaration
\*---------------------------------------------------------------------------*/
 
class derivedFields
:
    public fvMeshFunctionObject
{
public:
 
    // Public Enumerations
 
        //- Options for the derived/calculated field type
        enum derivedType
        {
            NONE = 0,           
            MASS_FLUX,          
            TOTAL_PRESSURE,     
            UNKNOWN
        };
 
        //- Names for derivedType
        static const Enum<derivedType> knownNames;
 
 
protected:
 
    // Read from dictionary
 
        //- List of derived field (types) to create
        List<derivedType> derivedTypes_;
 
        //- Reference density (to convert from kinematic to static pressure)
        scalar rhoRef_;
 
 
    // Protected Member Functions
 
        //- Hard-coded derived field (rho * U)
        //  \return true if field did not previously exist
        bool add_rhoU(const word& derivedName);
 
        //- Hard-coded derived field (p + 1/2 * rho * U)
        //  \return true if field did not previously exist
        bool add_pTotal(const word& derivedName);
 
 
public:
 
    //- Run-time type information
    TypeName("derivedFields");
 
 
    // Constructors
 
        //- Construct from name, Time and dictionary
        derivedFields
        (
            const word& name,
            const Time& runTime,
            const dictionary& dict
        );
 
        //- No copy construct
        derivedFields(const derivedFields&) = delete;
 
        //- No copy assignment
        void operator=(const derivedFields&) = delete;
 
 
    //- Destructor
    virtual ~derivedFields() = default;
 
 
    // Member Functions
 
        //- Remove (checkOut) derived fields from the object registry
        void removeDerivedFields();
 
        //- Read the function-object dictionary
        virtual bool read(const dictionary& dict);
 
        //- Execute the function-object operations
        virtual bool execute();
 
        //- Write the function-object results
        virtual bool write();
 
        //- Update for changes of mesh
        virtual void updateMesh(const mapPolyMesh& mpm);
 
        //- Update for mesh point-motion
        virtual void movePoints(const polyMesh& m);
};
 
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
} // End namespace functionObjects
} // End namespace Foam
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
#endif
 
// ************************************************************************* //