CFD Online Discussion Forums - Power Spectral Density for velocity with postProcessing "noise"

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Power Spectral Density for velocity with postProcessing "noise"

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?

I guess I found the answer...

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...

Unfortunately it doesnt work for U... Nobody knows how can I do postprocessing the PSD of velocity?

Small test for validation of psd

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 (Post 757441)

Code:

mpirun -np 16 noise -dict system/noiseDict-point -parallel