[Paraview] Vorticity Calculation

[Sebastian]

Hello,

I am trying to calculate the vorticity of a velocity vector field in Paraview 
3.14.1 (64bit).
I tried using the "Compute Derivatives" and "Gradient Of Unstructured DataSet"
filters but both return completely different results.
Also, the results do not match with my reference data at all.
What is the correct way to calculate the vorticity from a velocity vector field
in Paraview?

Best,
Sebastian