Contours of Swirl Strength in Fluent
 

Hi,
I am working on a problem of Tip Leakage Flow in a Low Pressure Gas Turbine Airfoil. My cases are at Low Reynolds Number. Due to the complexity in the Endwall Region I am using Transition SST Model and finer grids. I am running Transient. I got the results for Pressure Distribution and Total Pressure losses and it matches well with the experiments. I am using Velocity Inlet and Pressure Outlet Conditions. Turbulence properties TuI and Hydraulic Diameter is defined at the inlet and I also specified the Velocity Profile at the inlet.

I wanna plot the contours of Swirl Strength and I know it is defined as defined as the imaginary portion of the complex eigenvalue of the local velocity gradient tensor. I can get the Velocity Gradient Tensor by defining Q = 0.5(Omega ij*Omegaij -Sij*Sij). I do not know how to plot Swirl Strength or how to define it using Custom Defined Functions.
Please help...Thanks