ddt2.H

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    Copyright (C) 2016-2020 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::ddt2
 
Group
    grpFieldFunctionObjects
 
Description
    Computes the magnitude or magnitude squared of the Eulerian time derivative
    of an input volume field for time-variant simulations
    (not appropriate to steady-state simulations).
 
    The result can be further used for determining e.g. variance or RMS values.
 
    Operands:
    \table
      Operand           | Type           | Location
      input             | vol<Type>Field   | <time>/inputFields
      output file       | -              | -
      output field      | vol<Type>Field   | <time>/outputField
    \endtable
 
    where \c Type can be one of:
        \c Scalar, \c Vector, \c SphericalTensor, \c SymmTensor, or \c Tensor.
 
Usage
    Minimal example by using \c system/controlDict.functions:
    \verbatim
    ddt2FO
    {
        // Mandatory entries
        type            ddt2;
        libs            (fieldFunctionObjects);
 
        // Optional entries
        result          d@@dt2;
        mag             <bool>;
 
        // Inherited entries
        fields          <wordList>;  // (<field1> <field2> ... <fieldN>);
        ...
    }
    \endverbatim
 
    where the entries mean:
    \table
      Property     | Description                        | Type | Reqd  | Deflt
      type         | Type name: ddt2                    | word |  yes  | -
      libs         | Library name: fieldFunctionObjects | word |  yes  | -
      fields       | Names of the operand fields        | wordList | yes | -
      mag          | Compute 'mag' instead of 'magSqr'  | bool |  no   | false
      result       | Name of results     | word |  no   | magSqr(ddt2(@@))
    \endtable
 
    The inherited entries are elaborated in:
      - \link functionObject.H \endlink
 
    A list of fields can contain exact names or regular expressions.
    The token '\@\@' in the result name is replaced by the name of the source
    field. In the special case of a single source field (specified as
    a non-regex), the '\@\@' token checking is suppressed.
 
    The function object will skip over fields that appear to have
    already been processed (ie, their names are similar to the output names).
 
SourceFiles
    ddt2.C
    ddt2Templates.C
 
\*---------------------------------------------------------------------------*/
 
#ifndef Foam_functionObjects_ddt2_H
#define Foam_functionObjects_ddt2_H
 
#include "fvMeshFunctionObject.H"
#include "volFieldsFwd.H"
#include "OFstream.H"
#include "regExp.H"
#include "HashSet.H"
#include "wordRes.H"
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
namespace Foam
{
namespace functionObjects
{
 
/*---------------------------------------------------------------------------*\
                            Class ddt2 Declaration
\*---------------------------------------------------------------------------*/
 
class ddt2
:
    public fvMeshFunctionObject
{
    // Private Data
 
        //- Name of fields to process
        wordRes selectFields_;
 
        //- Formatting for the result fields
        word resultName_;
 
        //- Avoid processing the same field twice
        mutable regExp denyField_;
 
        //- Hashed names of result fields
        wordHashSet results_;
 
        //- Flat to use 'mag' instead of 'magSqr'
        //  Cannot be adjusted during the simulation since it alters the
        //  dimensions of the output field
        const bool mag_;
 
 
    // Private Member Functions
 
        //- Accept unless field name appears to have already been processed
        bool accept(const word& fieldName) const;
 
        //- Apply for the volume field type
        template<class FieldType>
        int apply(const word& inputName, int& state);
 
        //- Process by trying to apply for various volume field types
        int process(const word& inputName);
 
 
public:
 
    //- Runtime type information
    TypeName("ddt2");
 
 
    // Constructors
 
        //- Construct from name, Time and dictionary
        ddt2
        (
            const word& name,
            const Time& runTime,
            const dictionary& dict
        );
 
        //- No copy construct
        ddt2(const ddt2&) = delete;
 
        //- No copy assignment
        void operator=(const ddt2&) = delete;
 
 
    //- Destructor
    virtual ~ddt2() = 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
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
#ifdef NoRepository
    #include "ddt2Templates.C"
#endif
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
#endif
 
// ************************************************************************* //