unrealistic bias in Z velocities.

[Jwely]

Uncertainty analysis is showing an exceptionally strong bias in the Z velocity measurements, which gets better as the interrogation plane moves down stream.

This bias can be checked for by examining the mean axial velocity measured in each vortex compared to the free stream velocity. In every single case, the mean axial velocity is slightly elevated from the free stream velocity measured with dynamic pressure, precisely as we would expect. This seems to indicate that in reality, Z measurements are not significantly biased.

One attempted fix is to remove the meshgrid recalculation for a small z displacement in the ArtificialPIV instance which generates the image pairs. We will see how it goes, but must wait yet many more hours for it to finish computing.

[Jwely]

After extensive review, no flaws can be found in the classes responsible for the creation of artificial particle images. Perhaps the simulation criteria is a little bit too drastically worse case, but no more time can be dedicated to discovering the issue. The results of the uncertainty analysis have proven useful and consistent in all maters pertaining to the X and Y velocity fluctuations. This issue will not be fixed by the graduation release.