multiply.H

Go to the documentation of this file.

/*---------------------------------------------------------------------------*\
  =========                 |
  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
   \\    /   O peration     |
    \\  /    A nd           | www.openfoam.com
     \\/     M anipulation  |
-------------------------------------------------------------------------------
    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::multiply
 
Group
    grpFieldFunctionObjects
 
Description
    Multiplies a given list of (at least two or more) fields and outputs the
    result into a new field.
 
    \verbatim
        fieldResult = field1 * field2 * ... * fieldN
    \endverbatim
 
    Operands:
    \table
      Operand      | Type                          | Location
      input        | vol<Type>Field(s) <!--
               --> |$FOAM_CASE/<time>/<inpField>s
      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
    multiply1
    {
        // Mandatory entries (unmodifiable)
        type    multiply;
        libs    (fieldFunctionObjects);
 
        // Mandatory (inherited) entry (runtime modifiable)
        fields  (<field1> <field2> ... <fieldN>);
 
        // Optional (inherited) entries
        ...
    }
    \endverbatim
 
    where the entries mean:
    \table
      Property     | Description                        | Type | Reqd | Dflt
      type         | Type name: multiply                | word | yes | -
      libs         | Library name: fieldFunctionObjects | word | yes | -
      fields       | Names of the operand fields        | wordList | yes | -
    \endtable
 
    The inherited entries are elaborated in:
     - \link functionObject.H \endlink
     - \link fieldsExpression.H \endlink
 
See also
    - Foam::functionObject
    - Foam::functionObjects::fieldsExpression
    - Foam::functionObjects::fvMeshFunctionObject
 
SourceFiles
    multiply.C
    multiplyTemplates.C
 
\*---------------------------------------------------------------------------*/
 
#ifndef functionObjects_multiply_H
#define functionObjects_multiply_H
 
#include "fieldsExpression.H"
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
namespace Foam
{
namespace functionObjects
{
 
/*---------------------------------------------------------------------------*\
                          Class multiply Declaration
\*---------------------------------------------------------------------------*/
 
class multiply
:
    public fieldsExpression
{
    //- Helper struct to define valid operations
    template<class Type1, class Type2>
    struct is_valid_op
    {
        static constexpr bool value =
            (pTraits<Type1>::rank == 0 || pTraits<Type2>::rank == 0)
         || (pTraits<Type1>::rank == 1 && pTraits<Type2>::rank == 1);
    };
 
 
    // Private Member Functions
 
        template<class Type>
        bool initialiseResult(const word& fieldName);
 
        template<class Type>
        bool multiplyResult(const word& fieldName, bool& processed);
 
        template<class Type1, class Type2>
        typename std::enable_if
        <
            is_valid_op<Type1, Type2>::value, bool
        >::type
        multiplyFieldType
        (
            GeometricField<Type1, fvPatchField, volMesh>& result,
            const word& fieldName,
            bool& processed
        );
 
        template<class Type1, class Type2>
        typename std::enable_if
        <
            !is_valid_op<Type1, Type2>::value, bool
        >::type
        multiplyFieldType
        (
            GeometricField<Type1, fvPatchField, volMesh>& result,
            const word& fieldName,
            bool& processed
        );
 
        //- Multiply the list of fields and return true if successful
        virtual bool calc();
 
 
public:
 
    friend class fieldsExpression;
 
 
    //- Runtime type information
    TypeName("multiply");
 
 
    // Constructors
 
        //- Construct from Time and dictionary
        multiply
        (
            const word& name,
            const Time& runTime,
            const dictionary& dict
        );
 
        //- No copy construct
        multiply(const multiply&) = delete;
 
        //- No copy assignment
        void operator=(const multiply&) = delete;
 
 
    //- Destructor
    virtual ~multiply() = default;
};
 
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
} // End namespace functionObjects
} // End namespace Foam
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
#ifdef NoRepository
    #include "multiplyTemplates.C"
#endif
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
#endif
 
// ************************************************************************* //