In the "Standard" version of Orca3D Marine CFD we use an approximate representation of the propeller called an actuator disk (or momentum disk). Here momentum sources are automatically inserted into the flow field to simulate both the body forces on the model that the propeller would generate, as well as the change to the flow field in terms of axial and rotational acceleration of the flow around the propeller. This causes a modification to the pressure field around the hull near the propeller.
As a result of this change in the pressure field, you can compute an estimate of 1-t by running the model with and without the propellers (at the same speed of course) and looking at the ratio of measured resistance. Then,
1-t = [Resistance without propeller] / [Resistance with propeller]
The input required in order to create the actuator disk model are the principal propeller characteristics (diameter, hub diameter, propeller thickness (essentially the hub length), location, thrust angles) and the propeller performance. Ideally, you would have propeller open water data for the propellers. However, if not Orca3D also allows you to use standard B-series or Gawn-Burrill propellers where you only need specify the number of blades, blade-area ratio, and pitch-diameter ratio and Orca3D computes the open water curves automatically. In either case, Orca3D Marine CFD does compute and display the propeller open water efficiency, etaO, as one of the custom plot variables in the simulation.
Regarding wake fraction, Orca3D Marine CFD can compute a "nominal" wake fraction, 1-w, by running a simulation without propellers and measuring the flow field at the location of where the propellers would be. The average velocity through the propeller disk location from this simulation is used to compute the nominal wake fraction. Of course you could do this for a number of speeds in order to get 1-w as a function of ship speed. See Simulating a Propeller Wake Survey for more information. To learn about including the wake fraction in the analysis, see Including the Effects of a Nominal Wake Fraction. It is important to recognize that this is not the same thing as the effective wake fraction which includes the interaction effects of the propeller since it is computed in the absence of the propeller.
It is not possible to compute the relative rotative efficiency, etaR, with the actuator disk approximation. However, there is also a "Premium" version of Orca3D Marine CFD that allows you to include the actual propeller CAD geometry in the CFD simulation. It is of course up to you to develop the propeller CAD model, but once you have that you can place the propeller in the simulation along with the ship/yacht hull. This approach allows you measure the real forces and torques on the propeller just like you would in a self-propelled model experiment. With that information you can get all of the interaction coefficients including etaR as well as the effective wake fraction. However, these simulations are more complex to set up and take longer to run, so the actuator disk approximation is often sufficient for vessel design purposes.