Perform noise analysis on surface-based pressure data. More...

Inheritance diagram for surfaceNoise:

Collaboration diagram for surfaceNoise:

Public Member Functions
	TypeName ("surfaceNoise")
	Runtime type information. More...

	surfaceNoise (const dictionary &dict, const bool readFields=true)
	Constructor. More...

virtual	~surfaceNoise ()=default
	Destructor. More...

virtual bool	read (const dictionary &dict)
	Read from dictionary. More...

virtual void	calculate ()
	Calculate. More...

Public Member Functions inherited from noiseModel
	TypeName ("noiseModel")
	Runtime type information. More...

	declareRunTimeSelectionTable (autoPtr, noiseModel, dictionary,(const dictionary &dict),(dict))
	Run time selection table. More...

	noiseModel (const dictionary &dict, const bool readFields=true)
	Constructor. More...

virtual	~noiseModel ()=default
	Destructor. More...

tmp< Foam::scalarField >	PSD (const scalarField &PSDf) const
	PSD [dB/Hz]. More...

tmp< scalarField >	SPL (const scalarField &Prms2, const scalar f) const
	SPL [dB]. More...

tmp< scalarField >	SPL (const scalarField &Prms2, const scalarField &f) const
	SPL [dB]. More...

void	cleanFFTW ()
	Clean up the FFTW. More...

void	writeWeightings () const
	Helper function to check weightings. More...

Protected Member Functions
void	initialise (const fileName &fName)
	Initialise. More...

void	readSurfaceData (const labelList &procFaceOffset, List< scalarField > &pData)
	Read surface data. More...

scalar	writeSurfaceData (const fileName &outDirBase, const word &fName, const word &title, const scalar freq, const scalarField &data, const labelList &procFaceOffset, const bool writeSurface) const
	Write surface data to file. More...

scalar	surfaceAverage (const scalarField &data, const labelList &procFaceOffset) const
	Calculate the area average value. More...

Protected Member Functions inherited from noiseModel
void	readWriteOption (const dictionary &dict, const word &lookup, bool &option) const
	Helper function to read write options and provide info feedback. More...

scalar	checkUniformTimeStep (const scalarList &times) const
	Check and return uniform time step. More...

bool	validateBounds (const scalarList &p) const
	Return true if all pressure data is within min/max bounds. More...

label	findStartTimeIndex (const instantList &allTimes, const scalar startTime) const
	Find and return start time index. More...

fileName	baseFileDir (const label dataseti) const
	Return the base output directory. More...

tmp< scalarField >	uniformFrequencies (const scalar deltaT, const bool check) const

tmp< scalarField >	octaves (const scalarField &data, const scalarField &f, const labelUList &freqBandIDs) const
	Generate octave data. More...

tmp< scalarField >	Pf (const scalarField &p) const
	Return the fft of the given pressure data. More...

tmp< scalarField >	meanPf (const scalarField &p) const
	Return the multi-window mean fft of the complete pressure data [Pa]. More...

tmp< scalarField >	RMSmeanPf (const scalarField &p) const

tmp< scalarField >	PSDf (const scalarField &p, const scalar deltaT) const

scalar	RAf (const scalar f) const
	A weighting function. More...

scalar	gainA (const scalar f) const
	A weighting as gain in dB. More...

scalar	RBf (const scalar f) const
	B weighting function. More...

scalar	gainB (const scalar f) const
	B weighting as gain in dB. More...

scalar	RCf (const scalar f) const
	C weighting function. More...

scalar	gainC (const scalar f) const
	C weighting as gain in dB. More...

scalar	RDf (const scalar f) const
	D weighting function. More...

scalar	gainD (const scalar f) const
	D weighting as gain in dB. More...

Protected Attributes
List< fileName >	inputFileNames_
	Input file names. More...

word	pName_
	Name of pressure field. More...

label	pIndex_
	Index of pressure field in reader field list. More...

scalarList	times_
	Sample times. More...

scalar	deltaT_
	Time step (constant) More...

label	startTimeIndex_
	Start time index. More...

label	nFace_
	Number of surface faces. More...

label	fftWriteInterval_
	Frequency data output interval, default = 1. More...

bool	areaAverage_

word	readerType_
	Reader type. More...

autoPtr< surfaceReader >	readerPtr_
	Pointer to the surface reader. More...

autoPtr< surfaceWriter >	writerPtr_
	Pointer to the surface writer. More...

Protected Attributes inherited from noiseModel
const dictionary	dict_
	Copy of dictionary used for construction. More...

scalar	rhoRef_
	Reference density (to convert from kinematic to static pressure) More...

label	nSamples_
	Number of samples in sampling window, default = 2^16. More...

scalar	fLower_
	Lower frequency limit, default = 25Hz. More...

scalar	fUpper_
	Upper frequency limit, default = 10kHz. More...

scalar	startTime_
	Start time, default = 0s. More...

autoPtr< windowModel >	windowModelPtr_
	Window model. More...

word	graphFormat_
	Graph format. More...

weightingType	SPLweighting_
	Weighting. More...

scalar	dBRef_
	Reference for dB calculation, default = 2e-5. More...

scalar	minPressure_
	Min pressure value. More...

scalar	maxPressure_
	Min pressure value. More...

fileName	outputPrefix_
	Output file prefix, default = ''. More...

bool	writePrmsf_
	Write Prmsf; default = yes. More...

bool	writeSPL_
	Write SPL; default = yes. More...

bool	writePSD_
	Write PSD; default = yes. More...

bool	writePSDf_
	Write PSDf; default = yes. More...

bool	writeOctaves_
	Write writeOctaves; default = yes. More...

planInfo	planInfo_
	Plan information for FFTW. More...

Additional Inherited Members
Public Types inherited from noiseModel
enum	weightingType { none, dBA, dBB, dBC, dBD }

Static Public Member Functions inherited from noiseModel
static autoPtr< noiseModel >	New (const dictionary &dict)
	Selector. More...

Static Public Attributes inherited from noiseModel
static const Enum< weightingType >	weightingTypeNames_

Static Protected Member Functions inherited from noiseModel
static void	setOctaveBands (const scalarField &f, const scalar fLower, const scalar fUpper, const scalar octave, labelList &fBandIDs, scalarField &fCentre)

Detailed Description

Perform noise analysis on surface-based pressure data.

Input data is read from a dictionary, e.g.

// Pressure reference
pRef            0;

// Number of samples in sampling window, default = 2^16 (=65536)
N               4096;

// Lower frequency bounds
fl              25;

// Upper frequency bounds
fu              25;

// Start time
startTime       0;

windowModel     <modelType>
<modelType>Coeffs
{
    ...
}

// Input file
file            "postProcessing/faceSource1/surface/patch/patch.case";
//files           ("postProcessing/faceSource1/surface/patch/patch.case");

// Write interval for FFT data, default = 1
fftWriteInterval 100;

// Area-weighted averaging switch, default = no (ensemble) for backwards
// compatibility
areaAverage     yes;

// Surface reader
reader          ensight;

// Surface writer
writer          ensight;

// Collate times for ensight output - ensures geometry is only written once
writeOptions
{
    ensight
    {
        collateTimes true;
    }

    // Write Prmsf; default = yes
    writePrmsf  no;

    // Write SPL; default = yes
    writeSPL    yes;

    // Write PSD; default = yes
    writePSD    yes;

    // Write PSDf; default = yes
    writePSDf   no;

    // Write writeOctaves; default = yes
    writeOctaves yes;
}

Source files

See also: noiseModel.H

Definition at line 130 of file surfaceNoise.H.

Constructor & Destructor Documentation

◆ surfaceNoise()

surfaceNoise	(	const dictionary &	dict,
		const bool	readFields = `true`
	)

Constructor.

Definition at line 430 of file surfaceNoise.C.

References dict, surfaceNoise::read(), and Foam::readFields().

Here is the call graph for this function:

◆ ~surfaceNoise()

virtual ~surfaceNoise ( )

virtualdefault

Destructor.

Member Function Documentation

◆ initialise()

void initialise ( const fileName & fName )

protected

Initialise.

Definition at line 49 of file surfaceNoise.C.

References noiseModel::checkUniformTimeStep(), surfaceNoise::deltaT_, Foam::endl(), Foam::exit(), Foam::FatalError, FatalErrorInFunction, fieldNames(), noiseModel::findStartTimeIndex(), forAll, Foam::Info, UPstream::master(), surfaceReader::New(), surfaceNoise::nFace_, surfaceNoise::pIndex_, surfaceNoise::pName_, surfaceNoise::readerPtr_, surfaceNoise::readerType_, Pstream::scatter(), List< T >::setSize(), MeshedSurface< Face >::size(), noiseModel::startTime_, surfaceNoise::startTimeIndex_, surfaceNoise::times_, and noiseModel::windowModelPtr_.

Referenced by surfaceNoise::calculate().

Here is the call graph for this function:

Here is the caller graph for this function:

◆ readSurfaceData()

void readSurfaceData	(	const labelList &	procFaceOffset,
		List< scalarField > &	pData
	)

protected

Read surface data.

Definition at line 118 of file surfaceNoise.C.

References UPstream::allProcs(), Foam::average(), PstreamBuffers::clear(), Foam::endl(), PstreamBuffers::finishedSends(), forAll, Foam::Info, UPstream::master(), UPstream::myProcNo(), Foam::nl, UPstream::nonBlocking, p, UPstream::parRun(), Foam::returnReduce(), and List< T >::setSize().

Referenced by surfaceNoise::calculate().

Here is the call graph for this function:

Here is the caller graph for this function:

◆ writeSurfaceData()

scalar writeSurfaceData	(	const fileName &	outDirBase,
		const word &	fName,
		const word &	title,
		const scalar	freq,
		const scalarField &	data,
		const labelList &	procFaceOffset,
		const bool	writeSurface
	)		const