[Paraview] Calculating Vorticity from Velocity Vector

[Aditya Saurabh]

Hi!
I have to create an animation(movie) from turbulent flow dataset urgently! I
would really appreciate your help.
I have a VTK_RECTILINEAR_GRID turbulent fluid flow dataset with velocity
(vector) and pressure (scalar). I want to create vorticity isosurfaces. I
know vorticity is curl of velocity vector, i.e. del 'cross product' V, where
del is vector gradient operator and V is velocity vector. How do I calculate
vorticity from velocity in paraview? I searched a lot in filters, however,
could not find a vector gradient operator. The gradient filter of paraview
finds imageGradient and not vector gradient. When I applied calc and got a
component of velocity (which should supposedly be treated as scalar), even
then gradient was not enabled as an applicable filter.
Thanks in advance for your help.
Aditya
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