How to input vorticity into the control dictionary Version 2.3
 

Hello

I'm running an LES pimpleFoam simulation on a wing and don't know how to code in to compute vorticity in the domain at whatever time step interval I choose. Any help would be appriated.
I tried using somebody else's code from here but it didn't work as it's an unknown function type.
(
vorticity
{
type vorticity;
outputControl timeStep;
outputInterval 1;
}
)
Note I'm using OpenFOAM version 2.3 as that's what's on my university cluster.

Thank you