Question

How is vorticity vector calculated from velocity vectors?

Answer 1

In a flow field, vorticity is related to fluid particle velocity which is defined as twice of rotation vector i.e. Thus, the curl of the velocity vector is equal to the vorticity. ... If at every point in the flow, the flow is called as rotational. It implies that the fluid elements have a finite angular velocity.

4 - nptel

I'm not sure

I think this is correct answer