FFT of the pressure field. More...

#include <randomProcesses/noiseFFT.H>

Detailed Description

FFT of the pressure field.

Source files

Definition at line 50 of file noiseFFT.H.

Inheritance diagram for noiseFFT:

Collaboration diagram for noiseFFT:

List of all members.

Public Member Functions
	noiseFFT (const scalar deltat, const scalarField &pressure)
	Construct from pressure field.
	noiseFFT (Istream &)
	Construct from Istream.
	noiseFFT (const fileName &pFileName, const label skip=0)
	Construct from pressure field file name.
graph	pt () const
	Return the graph of p(t)
tmp< scalarField >	window (const label N, const label n) const
	Return the nth window.
tmp< scalarField >	Hanning (const label N) const
	Return the Hanning window function.
tmp< scalarField >	Pf (const tmp< scalarField > &pn) const
	Return the fft of the given pressure data.
graph	meanPf (const label N, const label nw) const
	Return the multi-window mean fft of the complete pressure data.
graph	RMSmeanPf (const label N, const label nw) const
	Return the multi-window RMS mean fft of the complete pressure data.
graph	Lf (const graph &gPf) const
	Return the narrow-band PFL (pressure-fluctuation level) spectrum.
graph	Ldelta (const graph &gLf, const scalar f1, const scalar fU) const
	Return the one-third-octave-band PFL spectrum.
graph	Pdelta (const graph &gLf, const scalar f1, const scalar fU) const
	Return the one-third-octave-band pressure spectrum.
scalar	Lsum (const graph &gLf) const
	Return the total PFL as the sum of Lf over all frequencies.
scalar	dbToPa (const scalar db) const
	Convert the db into Pa.
tmp< scalarField >	dbToPa (const tmp< scalarField > &db) const
	Convert the db-field into Pa.
Static Public Attributes
static scalar	p0 = 2e-5
	Reference pressure.

Constructor & Destructor Documentation

noiseFFT	(	const scalar	deltat,
		const scalarField &	pressure
	)

Construct from pressure field.

Definition at line 41 of file noiseFFT.C.

noiseFFT ( Istream & )

Construct from Istream.

noiseFFT	(	const fileName &	pFileName,
		const label	skip = `0`
	)

Construct from pressure field file name.

Definition at line 52 of file noiseFFT.C.

References IOstream::eof(), Foam::exit(), Foam::FatalError, FatalErrorIn, IOstream::good(), Field< Type >::operator=(), DynamicList< T, SizeInc, SizeMult, SizeDiv >::shrink(), List< T >::size(), and Field< Type >::T().

Member Function Documentation

Foam::graph pt ( ) const

Return the graph of p(t)

Definition at line 111 of file noiseFFT.C.

References forAll.

Foam::tmp< Foam::scalarField > window	(	const label	N,
		const label	n
	)		const

Return the nth window.

Definition at line 131 of file noiseFFT.C.

References Foam::endl(), Foam::exit(), Foam::FatalError, FatalErrorIn, and forAll.

Foam::tmp< Foam::scalarField > Hanning ( const label N ) const

Return the Hanning window function.

Definition at line 162 of file noiseFFT.C.

References Foam::cos(), forAll, Foam::mathematicalConstant::pi(), and Foam::T().

Foam::tmp< Foam::scalarField > Pf ( const tmp< scalarField > & pn ) const

Return the fft of the given pressure data.

Definition at line 177 of file noiseFFT.C.

References tmp< T >::clear(), Foam::mag(), Foam::ReComplexField(), fft::reverseTransform(), and Foam::sqrt().

Foam::graph meanPf	(	const label	N,
		const label	nw
	)		const

Return the multi-window mean fft of the complete pressure data.

Definition at line 212 of file noiseFFT.C.

References Foam::endl(), Foam::exit(), f(), Foam::FatalError, FatalErrorIn, forAll, and List< T >::size().

Foam::graph RMSmeanPf	(	const label	N,
		const label	nw
	)		const

Return the multi-window RMS mean fft of the complete pressure data.

Definition at line 258 of file noiseFFT.C.

References Foam::endl(), Foam::exit(), f(), Foam::FatalError, FatalErrorIn, forAll, List< T >::size(), Foam::sqr(), and Foam::sqrt().

Foam::graph Lf ( const graph & gPf ) const

Return the narrow-band PFL (pressure-fluctuation level) spectrum.

Definition at line 303 of file noiseFFT.C.

References Foam::log10(), graph::x(), and graph::y().

Foam::graph Ldelta	(	const graph &	gLf,
		const scalar	f1,
		const scalar	fU
	)		const

Return the one-third-octave-band PFL spectrum.

starting at octave with mean frequency f1

Definition at line 317 of file noiseFFT.C.

References Foam::cbrt(), f(), fu, Foam::log10(), Foam::pow(), List< T >::setSize(), List< T >::size(), Foam::sqrt(), graph::x(), and graph::y().

Foam::graph Pdelta	(	const graph &	gLf,
		const scalar	f1,
		const scalar	fU
	)		const

Return the one-third-octave-band pressure spectrum.

starting at octave with mean frequency f1

Definition at line 373 of file noiseFFT.C.

References Foam::cbrt(), f(), fu, List< T >::setSize(), List< T >::size(), Foam::sqr(), Foam::sqrt(), graph::x(), and graph::y().

Foam::scalar Lsum ( const graph & gLf ) const

Return the total PFL as the sum of Lf over all frequencies.

Definition at line 428 of file noiseFFT.C.

References forAll, Foam::log10(), Foam::pow(), and graph::y().

Foam::scalar dbToPa ( const scalar db ) const

Convert the db into Pa.

Definition at line 445 of file noiseFFT.C.

References Foam::pow().

Foam::tmp< Foam::scalarField > dbToPa ( const tmp< scalarField > & db ) const

Convert the db-field into Pa.

Definition at line 452 of file noiseFFT.C.

References Foam::pow().

Member Data Documentation

Foam::scalar p0 = 2e-5 [static]

Reference pressure.

Definition at line 63 of file noiseFFT.H.

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

src/randomProcesses/noise/noiseFFT.H
src/randomProcesses/noise/noiseFFT.C

noiseFFT Class Reference

Detailed Description

Public Member Functions

Static Public Attributes

Constructor & Destructor Documentation

Member Function Documentation

Member Data Documentation