Modifying a 3.4 IEA turbine to another offshore turbine

Wind & Water General
1

Hi,
I want to use the 3.4 MW IEA reference turbine to create a new fixed bottom offshore turbine with 3.2MW, 100m dia, 80m HH. I have the following details regarding the blade, the 1st,2nd and 3rd Flap and Edge freq. and the blade torsional freq., log decrement and damping and blade mass. I also have the blade planform details of chord location and length, twist, thickness, center pos and airfoil type (the airfoil polars are also available that includes aoa,cl,cd etc.). How should I proceed. The freq. and mass are the constraints. Few data points of the tower is also available. I don’t have any other data points mentioned in geometry.yaml or analysis.yaml or modelling.yaml.

Should I first Inverse design the rotor as mentioned in Inverse design and then use the blade and polar Airfoil files created and again run WISDEM.

2

Hello @Karthik.Prakash,

we have a tool that automatically ingests all these information and generates a model in OpenFAST. Unfortunately the tool is not open source. If you want to know more about it, please email us at Pietro.bortolotti@nrel.gov and Garrett.barter@nrel.gov

If you want to do things yourself, you are on the right track: start from WISDEM example 16 16. Inverse Design Example — WISDEM 2.0 documentation, then move on to example 6 6. Drivetrain Model Example — WISDEM 2.0 documentation, and lastly finish the design with example 5 5. Tower and Monopile Example — WISDEM 2.0 documentation

The user that opened the WISDEM issues #587, #594, #596 was also trying to do something similar to what you are doing, you could read what we recommended to them

3

Many Thanks for the reply @Pietro.Bortolotti .

I have a question regarding scaling the 3.4MW -130 m RWT to 3MW-95m design. I am trying to understand the implications of a different power density b/w the 2 models while scaling. The 3MW-95m will have the higher power density and will have loads implication based on what ambient condition I operate and may need to re-tune the controller. But, is there a word of caution when the power density changes while scaling and something to watch out for.