AMR-Wind-OpenFAST overestimate 5 MW turbine power

[QB-Lin]

I am using AMR-Wind and OpenFAST to simulate the 5 MW floating offshore wind turbine (FOWT) under uniform wind and regular wave. I used the beamdyn to consider the nonlinear deformation of blade. The wind speed is 11.4 m/s (rated condition), the wave height is 7.58 m, and the wave period is 12.1 s. The power coefficient Cp of wind turbine in this case is 0.436. This result is based on the reference (Huang et al., 2025). The result (Huang et al., 2025) is much close to the reference of 5 MW turbine, so I think the literature result (Huang et al., 2025) is correct.
Here is the results from the reference (Huang et al., 2025). The averaged Cp of FOWT is 0.436.

In my simulation, the time steps of AMR-Wind and OpenFAST are 0.02 s and 0.001 s, respectively. The pitch angle (0 deg) and rotor speed (12.1 RPM) are fixed during simulation, and the servodyn is closed.
My boundary condition is: xlo.type = mass_inflow, xhi.type= pressure_outflow, ylo.type = yhi.type = zhi.type = symmetric_wall, zlo.type= wall_model (Moeng)
Results showed that the power coefficient (Cp) of AMR-Wind and OpenFAST is much larger than the reference (Huang et al., 2025). However, when I only use OpenFAST to simulate the case, the result is close to the reference (Huang et al., 2025).

It seems that the power is too large compared with the baseline results. The rated torque is 5 MW.

I use ylo.type = yhi.type = zhi.type =slip_wall, but it has little effect on it.

References

Huang H D, Liu Q, Iglesias G, et al. Advanced multi-physics modeling of floating offshore wind turbines for aerodynamic design and load management, Energy Conversion and Management, 2025, 346: 120437.
Jonkman J., Butterfield S., Musial W., et al., 2009, Definition of a 5-MW reference wind turbine for offshore system development, National Renewable Energy Lab, Golden, CO (United States).

[marchdf]

Thanks for opening this issue. We have a couple of these discussions (#1534, #1661) and I would recommend looking those over for tips on getting this to work.

Another way is you can look at our benchmark simulations: https://github.com/marchdf/exawind-benchmarks/tree/main/amr-wind. These illustrate verification/validation for several turbine configurations. Getting the openfast model correct is not trivial and I would recommend you look at differences between what we've used successfully and your setup.

[QB-Lin]

In the case "Calibrate_dx2p5_3_EPS5.00_WS_11.0", I see the two options
"
Actuator.T0.use_tip_correction = true
Actuator.T0.use_root_correction = true
"

But I do not see the introduction in the https://exawind.github.io/amr-wind/user/inputs_Actuator.html

Do the two setting work?

[QB-Lin]

epsilon size and actuator point number seems have small effect.

[github-actions]

This issue is stale because it has been open 30 days with no activity.