propellerInfo.H

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    Copyright (C) 2021-2025 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::propellerInfo
 
Group
    grpForcesFunctionObjects
 
Description
    Calculates propeller performance and wake field properties.
 
    Controlled by \c executeControl:
    - Propeller performance
      - Thrust coefficient, Kt
      - Torque coefficient, 10*Kq
      - Advance coefficient, J
      - Open water efficiency, etaO
      - Written to postProcessing/<name>/<time>/propellerPerformance.dat
 
    Controlled by writeControl:
    - Wake field text file
      - Wake: 1 - UzMean/URef
      - Velocity in cylindrical coordinates at xyz locations
      - Written to postProcessing/<name>/<time>/wake.dat
    - Axial wake field text file
      - 1 - Uz/URef at r/R and angle
      - Written to postProcessing/<name>/<time>/axialWake.dat
    - Velocity surface
      - Written to postProcessing/<name>/surfaces/<time>/disk.<fileType>
 
Usage
    Example of function object specification:
    \verbatim
    propellerInfo1
    {
        type            propellerInfo;
        libs            (forces);
        writeControl    writeTime;
 
        patches         ("propeller.*");
 
        URef            5; // Function1 type; 'constant' form shown here
        rho             rhoInf; // incompressible
        rhoInf          1.2;
 
        // Optionally write propeller performance data
        writePropellerPerformance yes;
 
 
        // Propeller data:
 
        // Radius
        radius          0.1;
 
        rotationMode    specified; // specified | MRF
 
        // rotationMode = specified:
        origin          (0 -0.1 0);
        n               25.15;
        axis            (0 1 0);
 
        // Optional reference direction for angle (alpha) = 0
        alphaAxis       (1 0 0);
 

 
        // Optionally write wake text files
        // Note: controlled by writeControl
        writeWakeFields yes;
 
        // Sample plane (disk) properties
        // Note: controlled by writeControl
        sampleDisk
        {
            surfaceWriter   vtk;
            r1              0.05;
            r2              0.2;
            nTheta          36;
            nRadial         10;
            interpolationScheme cellPoint;
            errorOnPointNotFound false;
        }
    }
    \endverbatim
 
    Where the entries comprise:
    \table
        Property        | Description                   | Reqd     | Deflt
        type            | Type name: propellerInfo      | yes      |
        log             | Write to standard output      | no       | no
        patches         | Patches included in the forces calculation | yes |
        p               | Pressure field name           | no       | p
        U               | Velocity field name           | no       | U
        rho             | Density field name            | no       | rho
        URef            | Reference velocity            | yes      |
        rotationMode    | Rotation mode (see below)     | yes      |
        origin          | Sample disk centre            | no*      |
        axis            | Propeller axis                | no*      |
        alphaAxis       | Axis that defines alpha=0 dir | no       |
        n               | Rotation speed [rev/sec]      | no*      |
        rpm             | Rotation speed [rev/min]      | no*      |
        MRF             | Name of MRF zone              | no*      |
        originOffset    | Origin offset for MRF mode    | no       | (0 0 0)
        writePropellerPerformance| Write propeller performance text file | yes |
        writeWakeFields | Write wake field text files   | yes      |
        surfaceWriter   | Sample disk surface writer    | no*      |
        r1              | Sample disk inner radius      | no       | 0
        r2              | Sample disk outer radius      | no*      |
        nTheta          | Divisions in theta direction  | no*      |
        nRadial         | Divisions in radial direction | no*      |
        interpolationScheme | Sampling interpolation scheme | no* | cell
    \endtable
 
 
Note
- URef is a scalar Function1 type, i.e. supports constant, table, lookup values
- rotationMode is used to set the origin, axis and revolutions per second
  (alternatively rpm)
  - if set to 'specified' all 3 entries are required
    - note: origin is the sample disk origin
  - if set to 'MRF' only the MRF entry is required
    - to move the sample disk away from the MRF origin, use the originOffset
- if writePropellerPerformance is set to on|true:
  - propellerPerformance text file will be written
- if writeWakeFields is set to on|true:
  - wake and axialWake text files will be written
- if the surfaceWriter entry is set, the sample disk surface will be written
  - extents set according to the r1 and r2 entries
  - discretised according to the nTheta and nRadial entries
 
See also
    Foam::functionObject::forces
    Foam::Function1
 
SourceFiles
    propellerInfo.C
 
\*---------------------------------------------------------------------------*/
 
#ifndef Foam_functionObjects_propellerInfo_H
#define Foam_functionObjects_propellerInfo_H
 
#include "forces.H"
#include "Enum.H"
#include "faceList.H"
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
namespace Foam
{
 
// Forward Declarations
template<class Type> class Function1;
class surfaceWriter;
 
namespace functionObjects
{
 
/*---------------------------------------------------------------------------*\
                        Class propellerInfo Declaration
\*---------------------------------------------------------------------------*/
 
class propellerInfo
:
    public forces
{
 
public:
 
    enum class rotationMode
    {
        SPECIFIED,
        MRF
    };
 
    static const Enum<rotationMode> rotationModeNames_;
 
 
protected:
 
    // Protected data
 
        //- Copy of dictionary used during construction
        dictionary dict_;
 
        //- Propeller radius
        scalar radius_;
 
        //- Reference velocity
        autoPtr<Function1<scalar>> URefPtr_;
 
        //- Rotation mode
        rotationMode rotationMode_;
 
        //- Name of MRF zone (if applicable)
        word MRFName_;
 
        //- Propeller speed (revolutions per second)
        scalar n_;
 
        //- Flag to write performance data
        bool writePropellerPerformance_;
 
        //- Propeller performance file
        autoPtr<OFstream> propellerPerformanceFilePtr_;
 
        //- Flag to write wake fields
        bool writeWakeFields_;
 
 
        // Wake field output
 
            //- Surface writer
            autoPtr<surfaceWriter> surfaceWriterPtr_;
 
            //- Number of surface divisions in theta direction
            label nTheta_;
 
            //- Number of surface divisions in radial direction
            label nRadial_;
 
            //- Surface points
            pointField points_;
 
            //- Flag to raise an error if the sample point is not found in the
            //- mesh. Default = false to enable. e.g. reduced geometry/symmetric
            //- cases
            bool errorOnPointNotFound_;
 
            //- Surface faces
            faceList faces_;
 
            //- Surface point sample cell IDs
            labelList cellIds_;
 
            //- List of participating points (parallel reduced)
            boolList pointMask_;
 
            //- Interpolation scheme
            word interpolationScheme_;
 
            //- Wake field file
            autoPtr<OFstream> wakeFilePtr_;
 
            //- Axial wake field file
            autoPtr<OFstream> axialWakeFilePtr_;
 
            //- Default value when a sample point is not found; default =
            //- scalar::min
            scalar nanValue_;
 
            //- Initialised flag
            bool initialised_;
 
 
    // Protected Member Functions
 
        //- Set the coordinate system
        void setCoordinateSystem(const dictionary& dict);
 
        //- Set the rotational speed
        void setRotationalSpeed();
 
        //- Create output files
        void createFiles();
 
        //- Return the velocity field
        const volVectorField& U() const;
 
 
        // Propeller performance text file
 
            //- Write the wake fields
            void writePropellerPerformance();
 
 
        // Wake text files
 
            //- Write the wake text file
            void writeWake(const vectorField& U, const scalar URef);
 
            //- Write the axial wake text file
            void writeAxialWake(const vectorField& U, const scalar URef);
 
            //- Write the wake fields
            void writeWakeFields(const scalar URef);
 
 
        // Sample surface functions
 
            //- Set the faces and points for the sample surface
            void setSampleDiskGeometry
            (
                const coordinateSystem& coordSys,
                const scalar r1,
                const scalar r2,
                const scalar nTheta,
                const label nRadius,
                faceList& faces,
                pointField& points
            ) const;
 
            //- Set the sample surface based on dictionary settings
            void setSampleDiskSurface(const dictionary& dict);
 
            //- Set the sample cells corresponding to the sample points
            void updateSampleDiskCells();
 
            //- Return the area average of a field
            scalar meanSampleDiskField(const scalarField& field) const;
 
            //- Write the sample surface
            void writeSampleDiskSurface
            (
                const vectorField& U,
                const vectorField& Ur,
                const scalar URef
            );
 
            //- Interpolate from the mesh onto the sample surface
            template<class Type>
            tmp<Field<Type>> interpolate
            (
                const GeometricField<Type, fvPatchField, volMesh>& psi,
                const Type& defaultValue
            ) const;
 
        //- No copy construct
        propellerInfo(const propellerInfo&) = delete;
 
        //- No copy assignment
        void operator=(const propellerInfo&) = delete;
 
 
public:
 
    //- Runtime type information
    TypeName("propellerInfo");
 
 
    // Constructors
 
        //- Construct from name, Time and dictionary
        propellerInfo
        (
            const word& name,
            const Time& runTime,
            const dictionary& dict,
            const bool readFields = true
        );
 
        //- Construct from objectRegistry and dictionary
        propellerInfo
        (
            const word& name,
            const objectRegistry& obr,
            const dictionary& dict,
            const bool readFields = true
        );
 
 
    //- Destructor
    virtual ~propellerInfo() = default;
 
 
    // Member Functions
 
        //- Read the function-object dictionary
        virtual bool read(const dictionary&);
 
        //- Execute the function-object operations
        virtual bool execute();
 
        //- Write the function-object results
        virtual bool write();
 
        void UpdateMesh(const mapPolyMesh& mpm);
 
        void movePoints(const polyMesh& mesh);
};
 
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
} // End namespace functionObjects
} // End namespace Foam
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
#endif
 
// ************************************************************************* //