wallShearStress.H

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/*---------------------------------------------------------------------------*\
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    Copyright (C) 2013-2016 OpenFOAM Foundation
    Copyright (C) 2015-2020 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.
 
    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::wallShearStress
 
Group
    grpForcesFunctionObjects
 
Description
    Computes the wall-shear stress at selected wall patches.
 
    \f[
        \vec \tau = \vec R \cdot \vec n
    \f]
 
    where
    \vartable
        \vec \tau   | Wall shear stress vector [m^2/s^2]
        \vec R | Shear-stress symmetric tensor (retrieved from turbulence model)
        \vec n | Patch normal vector (into the domain)
    \endvartable
 
    Operands:
    \table
      Operand        | Type              | Location
      input          | -                 | -
      output file    | dat | $FOAM_CASE/postProcessing/<FO>/<time>/<field>
      output field   | volVectorField (only boundaryField) <!--
                 --> | $FOAM_CASE/<time>/<outField>
    \endtable
 
Usage
    Minimal example by using \c system/controlDict.functions:
    \verbatim
    wallShearStress1
    {
        // Mandatory entries (unmodifiable)
        type        wallShearStress;
        libs        (fieldFunctionObjects);
 
        // Optional entries (runtime modifiable)
        patches     (<patch1> ... <patchN>); // (wall1 "(wall2|wall3)");
 
        // Optional (inherited) entries
        ...
    }
    \endverbatim
 
    where the entries mean:
    \table
      Property     | Description                           | Type | Req'd | Dflt
      type         | Type name: wallShearStress            | word |  yes  | -
      libs         | Library name: fieldFunctionObjects    | word |  yes  | -
      patches    | Names of operand patches   | wordList | no | all wall patches
    \endtable
 
    The inherited entries are elaborated in:
     - \link functionObject.H \endlink
     - \link writeFile.H \endlink
 
    Minimal example by using the \c postProcess utility:
    \verbatim
        <solver> -postProcess -func wallShearStress
    \endverbatim
 
See also
    - Foam::functionObject
    - Foam::functionObjects::fvMeshFunctionObject
    - Foam::functionObjects::writeFile
    - ExtendedCodeGuide::functionObjects::field::wallShearStress
 
SourceFiles
    wallShearStress.C
 
\*---------------------------------------------------------------------------*/
 
#ifndef functionObjects_wallShearStress_H
#define functionObjects_wallShearStress_H
 
#include "fvMeshFunctionObject.H"
#include "writeFile.H"
#include "volFieldsFwd.H"
#include "HashSet.H"
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
namespace Foam
{
namespace functionObjects
{
 
/*---------------------------------------------------------------------------*\
                       Class wallShearStress Declaration
\*---------------------------------------------------------------------------*/
 
class wallShearStress
:
    public fvMeshFunctionObject,
    public writeFile
{
protected:
 
    // Protected Data
 
        //- Optional list of patches to process
        labelHashSet patchSet_;
 
 
    // Protected Member Functions
 
        //- File header information
        virtual void writeFileHeader(Ostream& os) const;
 
        //- Calculate the shear-stress
        void calcShearStress
        (
            const volSymmTensorField& Reff,
            volVectorField& shearStress
        );
 
 
public:
 
    //- Runtime type information
    TypeName("wallShearStress");
 
 
    // Constructors
 
        //- Construct from Time and dictionary
        wallShearStress
        (
            const word& name,
            const Time& runTime,
            const dictionary&
        );
 
        //- No copy construct
        wallShearStress(const wallShearStress&) = delete;
 
        //- No copy assignment
        void operator=(const wallShearStress&) = delete;
 
 
    //- Destructor
    virtual ~wallShearStress() = default;
 
 
    // Member Functions
 
        //- Read the wallShearStress data
        virtual bool read(const dictionary&);
 
        //- Calculate the wall shear-stress
        virtual bool execute();
 
        //- Write the wall shear-stress
        virtual bool write();
};
 
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
} // End namespace functionObjects
} // End namespace Foam
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
#endif
 
// ************************************************************************* //