Ansys Polyflow can calculate the vorticity vector 
for the flow. Vorticity is a measure of the rotation of a fluid
element as it moves in the flow field, and is defined as the curl of the velocity vector
(see [33], for example):
 | (30–12) |
This quantity is a vector representation of twice the antisymmetric part 
of the velocity gradient tensor given by
 | (30–13) |
For 3D flows, the vorticity vector 
is given in component form by
 | (30–14) |
For 2D planar and axisymmetric flows, the vorticity has one non-zero component only, and it is displayed as a signed scalar quantity. For 2D 1/2 flows, the magnitude of the vorticity vector is displayed, while it will appear as a vector in your graphical postprocessing program for 3D flows. The procedure for specifying the calculation of vorticity is as follows:
Create a new sub-task.
Create a sub-task
Select Postprocessor as the sub-task type.
Postprocessor
When prompted, enter a name for the postprocessor sub-task.
In the F.E.M. Task Postprocessor menu, select Vorticity.
Vorticity
Ansys Polydata will tell you where the calculation will be performed. You can click to continue. No additional parameters or boundary conditions are required.