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Power Spectral Density for velocity with postProcessing "noise"

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Old   February 10, 2020, 05:03
Default Power Spectral Density for velocity with postProcessing "noise"
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niewiemnic
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Hello,

I am searching info for the power spectral density of velocity (uu, boths in the direction of stream) in the phase of postprocessing.

It is clear that I can get results about PSD of pressure (fluctuation?) with e.g.

Code:
mpirun -np 16 noise -dict system/noiseDict-point -parallel
But I still dont know how can I get results of PSD of velocity.

My simulation is an aeroacoustic calculation about rod-airfoil configuration and the points on which I will get results are nearby rod and airfoil.

Does someone have any idea for that?
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Old   February 10, 2020, 10:45
Default I guess I found the answer...
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At first I collect the info about velocity fields with controlDict

Code:
probes
     {
         type            patchProbes;
         libs            ("libsampling.so");
         writeControl    timeStep;
         timeStart       2.0;
         patch           cylinder;
         probeLocations
          (
              (0.4 0.2 0.08) // E
             (-0.4 0.2 0.08) // W
            (0.07 0.2 0.3) // N
            (0.07 0.2 -0.3) // S
          );
         fields          (U p forces:force Curle);

     }
and I run the postProcess noise with


Code:
pointNoiseCoeffs
{
 windowModel     Hanning;

    files
    (
        "postProcessing/probes/0.1/U"
        "postProcessing/probes/0.1/p"
        "postProcessing/probes/0.1/Curle"
    );
...
}
I hope I understood right...
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Old   March 30, 2020, 16:07
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niewiemnic
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Unfortunately it doesnt work for U... Nobody knows how can I do postprocessing the PSD of velocity?
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Old   June 25, 2020, 09:30
Default Small test for validation of psd
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Kossivi GOKPI
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Hello spalartallmaras,
I'm working currently the OF version18+ in order to use psd utility. Everything is working quite good for pressure PSD calculation. Nevertheless I'm looking for a samll test case with result with other sofware for example Fluent to compare with what I get with OF.


I would like to know if you have a test case to validate the result of OF.


Kind regards,
Kossivi.



Quote:
Originally Posted by spalartallmaras View Post
Hello,

I am searching info for the power spectral density of velocity (uu, boths in the direction of stream) in the phase of postprocessing.

It is clear that I can get results about PSD of pressure (fluctuation?) with e.g.

Code:
mpirun -np 16 noise -dict system/noiseDict-point -parallel
But I still dont know how can I get results of PSD of velocity.

My simulation is an aeroacoustic calculation about rod-airfoil configuration and the points on which I will get results are nearby rod and airfoil.

Does someone have any idea for that?
__________________
Thanks in advance,

Kossivi.
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