ddt.H

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/*---------------------------------------------------------------------------*\
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-------------------------------------------------------------------------------
    Copyright (C) 2017 OpenFOAM Foundation
    Copyright (C) 2020 OpenCFD Ltd.
-------------------------------------------------------------------------------
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::ddt
 
Group
    grpFieldFunctionObjects
 
Description
    Computes the Eulerian time derivative of an input volume field for
    time-variant simulations (not appropriate to steady-state simulations).
 
    Operands:
    \table
      Operand           | Type             | Location
      input             | vol<Type>Field | $FOAM_CASE/<time>/<inpField>
      output file       | -                | -
      output field      | vol<Type>Field | $FOAM_CASE/<time>/<outField>
    \endtable
 
    where \c <Type>=Scalar/Vector/SphericalTensor/SymmTensor/Tensor.
 
Usage
    Minimal example by using \c system/controlDict.functions:
    \verbatim
    ddt1
    {
        // Mandatory entries (unmodifiable)
        type            ddt;
        libs            (fieldFunctionObjects);
 
        // Mandatory (inherited) entries (runtime modifiable)
        field           <field>;
 
        // Optional (inherited) entries
        ...
    }
    \endverbatim
 
    where the entries mean:
    \table
      Property     | Description                        | Type | Req'd | Dflt
      type         | Type name: ddt                     | word |  yes  | -
      libs         | Library name: fieldFunctionObjects | word |  yes  | -
      field        | Name of operand field              | word |  yes  | -
    \endtable
 
    The inherited entries are elaborated in:
     - \link functionObject.H \endlink
     - \link fieldExpression.H \endlink
 
    Minimal example by using the \c postProcess utility:
    \verbatim
        postProcess -func "ddt(<field>)"
    \endverbatim
 
See also
    - Foam::functionObject
    - Foam::functionObjects::fvMeshFunctionObject
    - Foam::functionObjects::fieldExpression
    - ExtendedCodeGuide::functionObjects::field::ddt
 
SourceFiles
    ddt.C
    ddtTemplates.C
 
\*---------------------------------------------------------------------------*/
 
#ifndef functionObjects_ddt_H
#define functionObjects_ddt_H
 
#include "fieldExpression.H"
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
namespace Foam
{
namespace functionObjects
{
 
/*---------------------------------------------------------------------------*\
                         Class ddt Declaration
\*---------------------------------------------------------------------------*/
 
class ddt
:
    public fieldExpression
{
 
    // Private Member Functions
 
        //- Calculate and store the result
        //  \return true if fieldName_ was known and had the correct type
        template<class Type>
        bool calcDdt();
 
        //- Calculate time derivative of the field
        //  \return true on success
        virtual bool calc();
 
 
public:
 
    //- Runtime type information
    TypeName("ddt");
 
 
    // Constructors
 
        //- Construct from Time and dictionary
        ddt
        (
            const word& name,
            const Time& runTime,
            const dictionary& dict
        );
 
        //- No copy construct
        ddt(const ddt&) = delete;
 
        //- No copy assignment
        void operator=(const ddt&) = delete;
 
 
    //- Destructor
    virtual ~ddt() = default;
};
 
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
} // End namespace functionObjects
} // End namespace Foam
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
#ifdef NoRepository
    #include "ddtTemplates.C"
#endif
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
#endif
 
// ************************************************************************* //