wallShearStress.H

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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::wallShearStress
 
Description
    Calculates and write the shear-stress at wall patches as
    the volVectorField field 'wallShearStress' or 'wallShearStress.<phase>'.
 
        \f[
            Stress = R \dot n
        \f]
 
    where
    \vartable
        R       | stress tensor
        n       | patch normal vector (into the domain)
    \endvartable
 
    The shear-stress symmetric tensor field is retrieved from the turbulence
    model.  All wall patches are included by default; to restrict the
    calculation to certain patches, use the optional 'patches' entry.
 
    Example of function object specification:
    \verbatim
    wallShearStress1
    {
        type        wallShearStress;
        libs        ("libfieldFunctionObjects.so");
        ...
        patches     (".*Wall");
    }
    \endverbatim
 
Usage
    \table
        Property | Description                | Required   | Default value
        type     | type name: wallShearStress | yes        |
        patch    | patch to process           | no         |
        patches  | list of patches to process | no         | all wall patches
        phase    | phase name                 | no         |
    \endtable
 
    Note:
        Writing field 'wallShearStress' is done by default, but it can be
        overridden by defining an empty \c objects list. For details see
        writeLocalObjects.
 
See also
    Foam::functionObject
    Foam::functionObjects::fvMeshFunctionObject
    Foam::functionObjects::logFiles
    Foam::functionObjects::writeLocalObjects
    Foam::functionObjects::timeControl
 
SourceFiles
    wallShearStress.C
 
\*---------------------------------------------------------------------------*/
 
#ifndef functionObjects_wallShearStress_H
#define functionObjects_wallShearStress_H
 
#include "fvMeshFunctionObject.H"
#include "logFiles.H"
#include "writeLocalObjects.H"
#include "volFieldsFwd.H"
#include "HashSet.H"
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
namespace Foam
{
namespace functionObjects
{
 
/*---------------------------------------------------------------------------*\
                       Class wallShearStress Declaration
\*---------------------------------------------------------------------------*/
 
class wallShearStress
:
    public fvMeshFunctionObject,
    public logFiles,
    public writeLocalObjects
{
    // Private Data
 
        //- The name of the phase
        word phaseName_;
 
        //- Optional list of patches to process
        labelHashSet patchSet_;
 
 
    // Private Member Functions
 
        //- File header information
        virtual void writeFileHeader(const label i);
 
        //- Calculate the shear-stress
        tmp<volVectorField> calcShearStress
        (
            const volSymmTensorField& tau
        );
 
 
public:
 
    //- Runtime type information
    TypeName("wallShearStress");
 
 
    // Constructors
 
        //- Construct from Time and dictionary
        wallShearStress
        (
            const word& name,
            const Time& runTime,
            const dictionary&
        );
 
        //- Disallow default bitwise copy construction
        wallShearStress(const wallShearStress&) = delete;
 
 
    //- Destructor
    virtual ~wallShearStress();
 
 
    // Member Functions
 
        //- Read the wallShearStress data
        virtual bool read(const dictionary&);
 
        //- Return the list of fields required
        virtual wordList fields() const
        {
            return wordList::null();
        }
 
        //- Calculate the wall shear-stress
        virtual bool execute();
 
        //- Write the wall shear-stress
        virtual bool write();
 
 
    // Member Operators
 
        //- Disallow default bitwise assignment
        void operator=(const wallShearStress&) = delete;
};
 
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
} // End namespace functionObjects
} // End namespace Foam
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
#endif
 
// ************************************************************************* //