[CFD XUE]

I am doing CFD simulation of Horizontal axis wind turbine by using Fluent.
Rotor dia = 6 m
Rotational speed = 20 rad/sec
Air velocity = 10 m/s
I am solving only one blade and using periodic boundary condition. I am using Single Rotating Reference Frame and pressure based solver. Solution is well converged. In fluent, we can write moment about x, y, and z axis.

I think moment about z-axis would be the rotor torque (z-axis is rotor axis). Am I right?

Calculated torque (30 N-m) (moment about z-axis) is around 2.5 time lesser than the torque predicted by BEM (78 N-m). What might be the reason?

I am solving laminar flow. Should I use turbulent flow? Which turbulent model would be appropriate?

Thanks