age.H

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    Copyright (C) 2018-2021 OpenFOAM Foundation
    Copyright (C) 2021-2025 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.
 
    OpenFOAM is distributed in the hope that it will be useful, but WITHOUT
    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
    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::age
 
Description
    Calculates and writes out the time taken for a particle to travel from an
    inlet to the location. Solves the following equation when incompressible:
 
    \f[
        \div (\phi t) = 1
    \f]
 
    where
    \vartable
        t    | Age [s]
        \phi | Volumetric flux [m^3/s]
    \endvartable
 
    Boundary conditions are generated automatically as \c zeroGradient
    on all walls and \c inletOutlet everywhere else.
 
Usage
    Minimal example by using \c system/controlDict.functions:
    \verbatim
    ageFO
    {
        // Mandatory entries
        type            age;
        libs            (fieldFunctionObjects);
 
        // Optional entries
        phi             <word>;
        rho             <word>;
        schemesField    <word>;
        tolerance       <scalar>;
        nCorr           <int>;
        diffusion       <bool>;
 
        // Inherited entries
        ...
    }
    \endverbatim
 
    where the entries mean:
    \table
      Property  | Description                        | Type | Reqd | Deflt
      type      | Type name: age                     | word | yes  | -
      libs      | Library name: fieldFunctionObjects | word | yes  | -
      phi       | Name of flux field                 | word | no   | phi
      rho       | Name of density field              | word | no   | rho
      schemesField | Name of the field from which schemes are taken <!--
                -->                                  | word | no   | age
      tolerance | Solver residual control            | scalar | no | 1e-5
      nCorr     | Maximum number of correctors       | int  | no   | 5
      diffusion | Flag to turn on/off the diffusion term | bool  | no | false
    \endtable
 
    The inherited entries are elaborated in:
      - \link functionObject.H \endlink
 
See also
  - Foam::functionObjects::comfort
 
SourceFiles
    age.C
 
\*---------------------------------------------------------------------------*/
 
#ifndef Foam_functionObjects_age_H
#define Foam_functionObjects_age_H
 
#include "fvMeshFunctionObject.H"
#include "volFields.H"
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
namespace Foam
{
namespace functionObjects
{
 
/*---------------------------------------------------------------------------*\
                             Class age Declaration
\*---------------------------------------------------------------------------*/
 
class age
:
    public fvMeshFunctionObject
{
    // Private Data
 
        //- The name of the flux field
        word phiName_;
 
        //- The name of the density field
        word rhoName_;
 
        //- Name of field from which schemes are taken
        word schemesField_;
 
        //- Name of the divergence scheme
        word divScheme_;
 
        //- Name of the Laplacian scheme
        word laplacianScheme_;
 
        //- Convergence tolerance
        scalar tolerance_;
 
        //- Number of corrections
        int nCorr_;
 
        //- Flag to turn on/off the diffusion term
        bool diffusion_;
 
        //- Flag that indicates if flux is mass-based or volume-based
        bool isCompressible_;
 
 
    // Private Member Functions
 
        //- The list of patch types for the age field
        wordList patchTypes() const;
 
        //- Return true if convergence is reached
        bool converged(const int nCorr, const scalar initialResidual) const;
 
 
public:
 
    //- Runtime type information
    TypeName("age");
 
 
    // Constructors
 
        //- Construct from name, Time and dictionary
        age
        (
            const word& name,
            const Time& runTime,
            const dictionary& dict
        );
 
 
    //- Destructor
    virtual ~age() = default;
 
 
    // Member Functions
 
        //- 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();
};
 
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
} // End namespace functionObjects
} // End namespace Foam
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
#endif
 
// ************************************************************************* //