noise.C File Reference

Utility to perform noise analysis of pressure data using the noiseFFT library. More...

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Detailed Description

Utility to perform noise analysis of pressure data using the noiseFFT library.

Original source file noise.C

Control settings are read from the $FOAM_CASE/system/noiseDict dictionary, or user-specified dictionary using the -dict option. Pressure data is read using a Table Function1:

Usage

pRef        101325;
N           65536;
nw          100;
f1          25;
fU          10000;
graphFormat raw;

pressureData
{
    file                "pressureData";
    nHeaderLine         1;          // number of header lines
    refColumn           0;          // reference column index
    componentColumns    (1);        // component column indices
    separator           " ";        // optional (defaults to ",")
    mergeSeparators     no;         // merge multiple separators
    outOfBounds         clamp;      // optional out-of-bounds handling
    interpolationScheme linear;     // optional interpolation scheme
}

where

Property	Description	Required	Default value
pRef	Reference pressure	no	0
N	Number of samples in sampling window	no	65536
nw	Number of sampling windows	no	100
fl	Lower frequency band	no	25
fU	Upper frequency band	no	10000
graphFormat	Output graph format	no	raw

Current graph outputs include:

• FFT of the pressure data
• narrow-band PFL (pressure-fluctuation level) spectrum
• one-third-octave-band PFL spectrum
• one-third-octave-band pressure spectrum

See also

Table.H noiseFFT.H

Definition in file noise.C.