Dear Dr. Jonkman,
thank you very much for your fast reply.
I am trying to model the Hywind spar-buoy wind turbine using only the strip-theory.
To do this I have to add the AddClin matrix (posted in the Hydrodyn user guide) to FAST.
I am facing some difficulties because I am not sure of some values that I have to implement.
Since the Spar-Buoy presents a double symmetry in the plane and I am not considering the marine growth, some terms cancel out (please see the attached image).
I am not sure how to calculate two terms:
- the undisplaced area A0; since the undisplaced volume is known (80291 m^3) it is correct to divide this value by the spar width (9.4m) to get this area?
- the total mass of ballasting, mf; in a older post you wrote “some members of OC3 tried to reverse-engineer the ballast and steel parts from the overall mass/inertia/cg properties of the OC3-Hywind spar, but these were never “officially” prescribed.”(Further Details about the Floating Platform of OC3 - #2 by Jason.Jonkman). I tried to figure out how to calculate this mass following your instruction, but I come across into new unknown data;
How can I obtain the “steel” mass?
Thank you for your help.
Best regards,
Gabriele
