How to calculate torque of the shaft for turbines in CFD fluent simulation ?
 

We are working on CFD simulation of hydrokinetic turbine. we are using MRF (multiple frame reference) modeling and calculate torque in CFD fluent software with z- direction has the axis of rotation. whether the torque calculated from CFD fluent is fluid torque or is it the torque of the shaft for the given flow velocity of fluid.
For torque calculation whether 6 degrees of freedom must be considered. Kindly clarify in this regard.