surfaceNoise

Surface-based noise

The surfaceNoise utility reads data in Ensight format, e.g.

noiseModel      surfaceNoise;

surfaceNoiseCoeffs
{
    // Common entries (see above)

    // Input file
    file       "postProcessing/faceSource1/surface/patch/patch.case";

    // Surface reader
    reader          ensight;

    // Surface writer
    writer          ensight;


    // Optional entries

    // Pressure field name; default = p
    p           p;

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

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

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

The surface noise model is parallel aware.

Pressure data is read in Ensight format

Input surface data must be provided in Ensight Format, e.g. using the surfaceFieldValue function object. When specifying the formatOPtions the collatedTimes option should be employed, i.e.

surfaceFormat   ensight;
formatOptions
{
    ensight
    {
        format          binary;
        collateTimes    true;
    }
}
fields          (p);

Output

Surface data:

Ensight surface containing SPL, PSD, one-third octave data
Instead of time, each snapshot represents a given frequency

surface noise

Text files:

Surface average frequency histories:
- Average_Prms_f.dat : RMS pressure [Pa]
- Average_PSD_dB_Hz_f.dat : Power Spectral Density in [dB/Hz]
- Average_PSD_f_f.dat : Power Spectral Density in [Pa $^2$ /Hz]
- Average_SPL_dB_f.dat : Sound Pressure Level [dB]

Further information

Source code

noise

API:

Foam::noiseModels::surfaceNoise

Surface-based noise​

Output​

Further information​

Surface-based noise

Output

Further information