[spalartallmaras]

Hello,

I want to make PSD diagram for velocity.

so I wrote my controlDict like this,

    patchProbes
    {
        type            patchProbes;
      	libs            (sampling);
	//writeControl    timeStep;
	writeControl    writeTime;
        timeStart       0.6;

        patch           zyl_naca0012;
        probeLocations
        (
            (-0.15045 0.2 0.00885) // A
            (0.04425 0.2 0.0177) // B
         );
        fields          (U p Curle);
    }

for p and Curle it works well, but for U I have only zero value for every timesteps.

# Probe 0 (-0.17741013 0.19999995 0.0023531675)
# Probe 1 (0.04411183 0.2 0.010945718)
#         Probe               0               1
#          Time
          0.601               (0 0 0)               (0 0 0)
          0.602               (0 0 0)               (0 0 0)
          0.603               (0 0 0)               (0 0 0)
          0.604               (0 0 0)               (0 0 0)
          0.605               (0 0 0)               (0 0 0)
          0.606               (0 0 0)               (0 0 0)
          0.607               (0 0 0)               (0 0 0)
          0.608               (0 0 0)               (0 0 0)
          0.609               (0 0 0)               (0 0 0)
           0.61               (0 0 0)               (0 0 0)
          0.611               (0 0 0)               (0 0 0)
          0.612               (0 0 0)               (0 0 0)
          0.613               (0 0 0)               (0 0 0)
          0.614               (0 0 0)               (0 0 0)
          0.615               (0 0 0)               (0 0 0)
and so on...

Do someone know how can I do probe for U or make PSD of velocity?

[olesen]

Maybe just that it is a no-slip BC and thus zero-velocity?

[spalartallmaras]

Here is the right answer for probes:

        probes
	{
		libs            (sampling);
	        type        probes;
         	name        probes;

	        fields          (p Curle U);
	        probeLocations
	        (
 	            (-0.925 0.04 1.6)
	            (0 0.04 1.85)
    	            (0.925 0.04 1.6)
	            (-0.15 0.04 0.01) // A
                    (0.045 0.04 0.02) // B
	        );
	}

Results:

# Probe 0 (-0.925 0.04 1.6)
# Probe 1 (0 0.04 1.85)
# Probe 2 (0.925 0.04 1.6)
# Probe 3 (-0.15 0.04 0.01)
# Probe 4 (0.045 0.04 0.02)
#          Probe                0                1                2                3                4
#           Time
               0                (68 0 0)                (68 0 0)                (68 0 0)                (68 0 0)                (68 0 0)
           0.081                (68.0014332 5.99036437e-10 0.00738969358)                (68.030297 -4.33218127e-08 0.0121846369)                (68.0643646 -1.24457047e-05 0.00762068548)                (31.0006862 2.28241103 -26.8158835)                (64.1542249 -11.4418305 6.65235618)
           0.082                (68.0014296 1.31878963e-09 0.00740097379)                (68.0305114 -4.17360714e-08 0.0122377878)                (68.064582 -1.30316188e-05 0.00770105171)                (31.4001765 5.95961984 0.494150689)                (51.2321979 -0.285955754 2.71000551)
           0.083                (68.0014491 7.12236223e-10 0.0074375163)                (68.0307652 -4.67176522e-08 0.0123226498)                (68.0647564 -1.33251934e-05 0.00773059729)                (33.6709631 -7.52004268 8.6170834)                (61.9887947 18.8947403 -5.23805307)
           0.084                (68.0014616 -5.88914933e-10 0.0074433959)                (68.0308733 -4.80321233e-08 0.0123194492)                (68.0647517 -1.36197217e-05 0.0077650226)                (44.6682783 10.1557355 23.1492018)                (77.8522556 -10.7819079 -5.72007478)
           0.085                (68.0014514 4.56040382e-10 0.00741534868)                (68.0310821 -4.70863241e-08 0.0124136671)                (68.0651851 -1.38559911e-05 0.00792646197)                (49.1198921 12.2354596 52.0417185)                (68.7600304 1.5191382 -17.9202192)
...