/usr/include/freefoam/randomProcesses/noiseFFT.H is in libfreefoam-dev 0.1.0+dfsg-1build1.
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========= |
\\ / F ield | OpenFOAM: The Open Source CFD Toolbox
\\ / O peration |
\\ / A nd | Copyright (C) 1991-2010 OpenCFD Ltd.
\\/ M anipulation |
-------------------------------------------------------------------------------
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
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You should have received a copy of the GNU General Public License
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Class
Foam::noiseFFT
Description
FFT of the pressure field
SourceFiles
noiseFFT.C
\*---------------------------------------------------------------------------*/
#ifndef noiseFFT_H
#define noiseFFT_H
#include <OpenFOAM/scalarField.H>
#include <OpenFOAM/graph.H>
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
namespace Foam
{
/*---------------------------------------------------------------------------*\
Class noiseFFT Declaration
\*---------------------------------------------------------------------------*/
class noiseFFT
:
public scalarField
{
// Private data
//- Time spacing of the raw data
scalar deltat_;
public:
//- Reference pressure
static scalar p0;
// Constructors
//- Construct from pressure field
noiseFFT
(
const scalar deltat,
const scalarField& pressure
);
//- Construct from Istream
noiseFFT(Istream&);
//- Construct from pressure field file name
noiseFFT(const fileName& pFileName, const label skip = 0);
// Member Functions
//- Return the graph of p(t)
graph pt() const;
//- Return the nth window
tmp<scalarField> window(const label N, const label n) const;
//- Return the Hanning window function
tmp<scalarField> Hanning(const label N) const;
//- Return the fft of the given pressure data
tmp<scalarField> Pf(const tmp<scalarField>& pn) const;
//- Return the multi-window mean fft of the complete pressure data
graph meanPf(const label N, const label nw) const;
//- Return the multi-window RMS mean fft of the complete pressure data
graph RMSmeanPf(const label N, const label nw) const;
//- Return the narrow-band PFL (pressure-fluctuation level) spectrum
graph Lf(const graph& gPf) const;
//- Return the one-third-octave-band PFL spectrum
// starting at octave with mean frequency f1
graph Ldelta(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
graph Pdelta(const graph& gLf, const scalar f1, const scalar fU) const;
//- Return the total PFL as the sum of Lf over all frequencies
scalar Lsum(const graph& gLf) const;
//- Convert the db into Pa
scalar dbToPa(const scalar db) const;
//- Convert the db-field into Pa
tmp<scalarField> dbToPa(const tmp<scalarField>& db) const;
};
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
} // End namespace Foam
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
#endif
// ************************ vim: set sw=4 sts=4 et: ************************ //
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