How are rotor diameters assigned to turbines?

[henrysanders3]

Hi all,

In this line of the example code #10, which file is it reading the rotor diameters from?

print(fi.floris.farm.rotor_diameters)

many thanks

[rafmudaf]

The rotor diameter is set in the input file. See https://github.com/NREL/floris/blob/main/examples/10_opt_yaw_single_ws.py#L29. In this case, it's using one of the turbines in the included turbine library, the NREL 5MW. That turbine definition is here.

To change the rotor diameter, you can either create an external turbine library (see #568 for a description of this feature and usage) or modify the rotor diameter within your script.

[henrysanders3]

HI @rafmudaf, I have altered the rotor diameter in the the turbine library, however when the line below is run, it still prints the value 126, despite it being changed to 107.

print(fi.floris.farm.rotor_diameters)

[rafmudaf]

I think @Bartdoekemeijer's script below adds the clarity I left out, and it should address your question. However, it's worth trying to understand why modifying the rotor diameter in the turbine library yaml files directly didn't work for you. @henrysanders3 how did you install floris?

[Bartdoekemeijer]

The answer by @rafmudaf is by far the most complete and correct solution. In addition, here's a quick way to update rotor diameters in a script-like fashion:

# Load default model and show rotor diameters
fi = FlorisInterface("inputs/gch.yaml") # GCH model matched to the default "legacy_gauss" of V2
print(fi.floris.farm.rotor_diameters)

# Update rotor diameters manually
turbine_dict = fi.floris.farm.turbine_definitions[0]  # Copy properties of first turbine
turbine_dict["rotor_diameter"] = 107.0  # Change rotor diameter
turbine_dicts = [turbine_dict] * fi.floris.farm.n_turbines  # Copy these turbine properties over to make a list with length equal to the number of wind turbines in the farm
fi.reinitialize(turbine_type=turbine_dicts)  # Update FLORIS object with these new turbine definitions
print(fi.floris.farm.rotor_diameters)

[henrysanders3]

thats really helpful, many thanks