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forceCoeffs Class Reference

Extends the forces functionObject by providing lift, drag and moment coefficients. The data can optionally be output into bins, defined in a given direction. More...

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Public Member Functions

 TypeName ("forceCoeffs")
 Runtime type information. More...
 
 forceCoeffs (const word &name, const Time &runTime, const dictionary &)
 Construct from Time and dictionary. More...
 
virtual ~forceCoeffs ()
 Destructor. More...
 
virtual bool read (const dictionary &)
 Read the forces data. More...
 
virtual bool execute ()
 Execute, currently does nothing. More...
 
virtual bool write ()
 Write the forces. More...
 
- Public Member Functions inherited from forces
 TypeName ("forces")
 Runtime type information. More...
 
 forces (const word &name, const Time &runTime, const dictionary &dict)
 Construct from Time and dictionary. More...
 
 forces (const word &name, const objectRegistry &obr, const dictionary &)
 Construct from objectRegistry and dictionary. More...
 
virtual ~forces ()
 Destructor. More...
 
virtual void calcForcesMoment ()
 Calculate the forces and moments. More...
 
virtual vector forceEff () const
 Return the total force. More...
 
virtual vector momentEff () const
 Return the total moment. More...
 
- Public Member Functions inherited from fvMeshFunctionObject
 TypeName ("fvMeshFunctionObject")
 Runtime type information. More...
 
 fvMeshFunctionObject (const word &name, const Time &runTime, const dictionary &dict)
 Construct from Time and dictionary. More...
 
 fvMeshFunctionObject (const word &name, const objectRegistry &obr, const dictionary &dict)
 Construct from the region objectRegistry and dictionary. More...
 
virtual ~fvMeshFunctionObject ()
 Destructor. More...
 
- Public Member Functions inherited from regionFunctionObject
 TypeName ("regionFunctionObject")
 Runtime type information. More...
 
 regionFunctionObject (const word &name, const Time &runTime, const dictionary &dict)
 Construct from Time and dictionary. More...
 
 regionFunctionObject (const word &name, const objectRegistry &obr, const dictionary &dict)
 Construct from the region objectRegistry and dictionary. More...
 
virtual ~regionFunctionObject ()
 Destructor. More...
 
- Public Member Functions inherited from functionObject
virtual const wordtype () const =0
 Runtime type information. More...
 
 declareRunTimeSelectionTable (autoPtr, functionObject, dictionary,(const word &name, const Time &runTime, const dictionary &dict),(name, runTime, dict))
 
 functionObject (const word &name)
 Construct from components. More...
 
autoPtr< functionObjectclone () const
 Return clone. More...
 
virtual ~functionObject ()
 Destructor. More...
 
const wordname () const
 Return the name of this functionObject. More...
 
virtual bool end ()
 Called when Time::run() determines that the time-loop exits. More...
 
virtual bool adjustTimeStep ()
 Called at the end of Time::adjustDeltaT() if adjustTime is true. More...
 
virtual void updateMesh (const mapPolyMesh &mpm)
 Update for changes of mesh. More...
 
virtual void movePoints (const polyMesh &mesh)
 Update for changes of mesh. More...
 
- Public Member Functions inherited from logFiles
 logFiles (const objectRegistry &obr, const word &prefix)
 Construct from objectRegistry and prefix. More...
 
virtual ~logFiles ()
 Destructor. More...
 
const wordListnames () const
 Return const access to the names. More...
 
PtrList< OFstream > & files ()
 Return access to the files. More...
 
OFstreamfile ()
 Return access to the file (if only 1) More...
 
OFstreamfile (const label i)
 Return file 'i'. More...
 
- Public Member Functions inherited from writeFile
 writeFile (const objectRegistry &obr, const word &prefix)
 Construct from objectRegistry and prefix. More...
 
 ~writeFile ()
 Destructor. More...
 
void initStream (Ostream &os) const
 Initialise the output stream for writing. More...
 
fileName baseFileDir () const
 Return the base directory for output. More...
 
fileName baseTimeDir () const
 Return the base directory for the current time value. More...
 
Omanip< int > valueWidth (const label offset=0) const
 Return the value width when writing to stream with optional offset. More...
 
void writeCommented (Ostream &os, const string &str) const
 Write a commented string to stream. More...
 
void writeTabbed (Ostream &os, const string &str) const
 Write a tabbed string to stream. More...
 
void writeHeader (Ostream &os, const string &str) const
 Write a commented header to stream. More...
 
void writeTime (Ostream &os) const
 Write the current time to stream. More...
 
template<class Type >
void writeHeaderValue (Ostream &os, const string &property, const Type &value) const
 Write a (commented) header property and value pair. More...
 
label charWidth () const
 Return width of character stream output. More...
 

Protected Member Functions

virtual void writeFileHeader (const label i)
 Output file header information. More...
 
- Protected Member Functions inherited from forces
wordList createFileNames (const dictionary &dict) const
 Create file names for forces and bins. More...
 
void initialise ()
 Initialise the fields. More...
 
tmp< volSymmTensorFielddevRhoReff () const
 Return the effective viscous stress (laminar + turbulent). More...
 
tmp< volScalarFieldmu () const
 Dynamic viscosity field. More...
 
tmp< volScalarFieldrho () const
 Return rho if specified otherwise rhoRef. More...
 
scalar rho (const volScalarField &p) const
 Return rhoRef if the pressure field is dynamic, i.e. p/rho. More...
 
void applyBins (const vectorField &Md, const vectorField &fN, const vectorField &fT, const vectorField &fP, const vectorField &d)
 Accumulate bin data. More...
 
void writeForces ()
 Helper function to write force data. More...
 
void writeBins ()
 Helper function to write bin data. More...
 
 forces (const forces &)
 Disallow default bitwise copy construct. More...
 
void operator= (const forces &)
 Disallow default bitwise assignment. More...
 
- Protected Member Functions inherited from regionFunctionObject
template<class ObjectType >
bool foundObject (const word &fieldName) const
 Find field in the objectRegistry. More...
 
template<class ObjectType >
const ObjectType & lookupObject (const word &fieldName) const
 Lookup object from the objectRegistry. More...
 
template<class ObjectType >
ObjectType & lookupObjectRef (const word &fieldName)
 Lookup non-const object reference from the objectRegistry. More...
 
template<class ObjectType >
bool store (word &fieldName, const tmp< ObjectType > &tfield, bool cacheable=false)
 Store the given field in the objectRegistry under the given name. More...
 
bool writeObject (const word &fieldName)
 Write field if present in objectRegistry. More...
 
bool clearObject (const word &fieldName)
 Clear field from the objectRegistry if present. More...
 
- Protected Member Functions inherited from logFiles
virtual void createFiles ()
 Create the output file. More...
 
virtual void resetNames (const wordList &names)
 Reset the list of names from a wordList. More...
 
virtual void resetName (const word &name)
 Reset the list of names to a single name entry. More...
 

Additional Inherited Members

- Static Public Member Functions inherited from functionObject
static autoPtr< functionObjectNew (const word &name, const Time &, const dictionary &)
 Select from dictionary, based on its "type" entry. More...
 
- Public Attributes inherited from functionObject
Switch log
 Switch write log to Info. More...
 
- Static Public Attributes inherited from functionObject
static int debug
 
static bool postProcess
 Global post-processing mode switch. More...
 
- Static Public Attributes inherited from writeFile
static const word outputPrefix
 Directory prefix. More...
 
static label addChars = 7
 Additional characters for writing. More...
 
- Protected Types inherited from forces
enum  fileID { MAIN_FILE = 0, BINS_FILE = 1 }
 Enumeration for ensuring the right file is accessed. More...
 
- Protected Attributes inherited from forces
List< Field< vector > > force_
 Pressure, viscous and porous force per bin. More...
 
List< Field< vector > > moment_
 Pressure, viscous and porous moment per bin. More...
 
labelHashSet patchSet_
 Patches to integrate forces over. More...
 
word pName_
 Name of pressure field. More...
 
word UName_
 Name of velocity field. More...
 
word rhoName_
 Name of density field (optional) More...
 
Switch directForceDensity_
 Is the force density being supplied directly? More...
 
word fDName_
 The name of the force density (fD) field. More...
 
scalar rhoRef_
 Reference density needed for incompressible calculations. More...
 
scalar pRef_
 Reference pressure. More...
 
coordinateSystem coordSys_
 Coordinate system used when evaluting forces/moments. More...
 
bool localSystem_
 Flag to indicate whether we are using a local co-ordinate sys. More...
 
bool porosity_
 Flag to include porosity effects. More...
 
label nBin_
 Number of bins. More...
 
vector binDir_
 Direction used to determine bin orientation. More...
 
scalar binDx_
 Distance between bin divisions. More...
 
scalar binMin_
 Minimum bin bounds. More...
 
List< pointbinPoints_
 Bin positions along binDir. More...
 
bool binCumulative_
 Should bin data be cumulative? More...
 
bool initialised_
 Initialised flag. More...
 
- Protected Attributes inherited from fvMeshFunctionObject
const fvMeshmesh_
 Reference to the fvMesh. More...
 
- Protected Attributes inherited from regionFunctionObject
const Timetime_
 Reference to the Time. More...
 
const objectRegistryobr_
 Reference to the region objectRegistry. More...
 
- Protected Attributes inherited from logFiles
wordList names_
 File names. More...
 
PtrList< OFstreamfilePtrs_
 File pointer. More...
 
- Protected Attributes inherited from writeFile
const objectRegistryfileObr_
 Reference to the region objectRegistry. More...
 
const word prefix_
 Prefix. More...
 

Detailed Description

Extends the forces functionObject by providing lift, drag and moment coefficients. The data can optionally be output into bins, defined in a given direction.

Example of function object specification:

forceCoeffs1
{
    type        forceCoeffs;
    libs        ("libforces.so");
    ...
    log         yes;
    patches     (walls);
    liftDir     (0 1 0);
    dragDir     (-1 0 0);
    pitchAxis   (0 0 1);
    magUInf     100;
    lRef        3.5;
    Aref        2.2;

    binData
    {
        nBin        20;
        direction   (1 0 0);
        cumulative  yes;
    }
}
Usage
Property Description Required Default value
type type name: forces yes
log write force data to standard output no no
patches patches included in the forces calculation yes
liftDir lift direction yes
dragDir drag direction yes
pitchAxis picth axis yes
magUInf free stream velocity magnitude yes
lRef reference length scale for moment calculations yes
Aref reference area yes

Bin data is optional, but if the dictionary is present, the entries must be defined according o

nBin number of data bins yes
direction direction along which bins are defined yes
cumulative bin data accumulated with incresing distance yes
See also
Foam::functionObject Foam::functionObjects::timeControl Foam::functionObjects::forces
Source files

Definition at line 172 of file forceCoeffs.H.

Constructor & Destructor Documentation

◆ forceCoeffs()

forceCoeffs ( const word name,
const Time runTime,
const dictionary dict 
)

Construct from Time and dictionary.

Definition at line 128 of file forceCoeffs.C.

References Foam::read().

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◆ ~forceCoeffs()

~forceCoeffs ( )
virtual

Destructor.

Definition at line 148 of file forceCoeffs.C.

Member Function Documentation

◆ writeFileHeader()

void writeFileHeader ( const label  i)
protectedvirtual

Output file header information.

Reimplemented from forces.

Definition at line 43 of file forceCoeffs.C.

References Foam::abort(), Foam::endl(), Foam::FatalError, FatalErrorInFunction, forAll, Foam::jn(), Foam::name(), Foam::nl, and Foam::tab.

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◆ TypeName()

TypeName ( "forceCoeffs"  )

Runtime type information.

◆ read()

bool read ( const dictionary dict)
virtual

Read the forces data.

Reimplemented from forces.

Definition at line 154 of file forceCoeffs.C.

References dictionary::lookup(), and forces::read().

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◆ execute()

bool execute ( )
virtual

Execute, currently does nothing.

Reimplemented from forces.

Definition at line 177 of file forceCoeffs.C.

◆ write()

bool write ( )
virtual

Write the forces.

Reimplemented from forces.

Definition at line 183 of file forceCoeffs.C.

References forces::calcForcesMoment(), Foam::endl(), forAll, Log, UPstream::master(), Foam::name(), Foam::nl, pDyn(), List< T >::setSize(), List< T >::size(), Foam::sum(), Foam::tab, Foam::type(), and logFiles::write().

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The documentation for this class was generated from the following files: