NWTC

Dear Jason, This is very intersting! I'd better make sure these frequencies are in order! I'm going to have a go this weekend. In fact the SurgeSawySparInput.png is a plot of the results when I set PotFile to link to Spar files that you produced for OC3 Hywind turbine. And HWS is when I use the data...

And here are my files

Thank you

Here are the plots:

Dear OpenFAST team, I'm trying to model Hywind Scotland spar turbine, here's the problem: I generated the Potential flow solution input data using Nemoh a code from Nantes polytechnic that does similar thing as WAMIT. The results of these calculations are attached below (I'll have to split to severa...

Dear OpenFAST Team, I have current data which I would like to add to my model simulation. I'm attaching the information which describes currents at different depths. What would be the best way to translate it into HydroDyn file sub-surface and near-surface currents? In this data the current directio...

Dear Jason, The Torque Regions is the output from the scope with the same name, from the Simulink torque control. I'm attaching a graph print. The second scope is used to produce the 'blow-up' image. Thank you for taking the time to answer. I like the idea to use the blade pitch angle to stay in Reg...

Dear Jason, I'm afraid I have some more questions. The simulation result from the previous post were obtained for still water conditions. In this post, I am attaching similar graphs for two cases with regular waves. One has Tp=10s and Hs=1. The other one has Tp=33 and Hs=1. The second one is really ...

Here are some blow-up plots of torques 2 and 2.5 and the pitch angle. Wind speed is in the image with platform motions. Can I linearize about any of the operating points from this simulation?

Thank you!

Dear Jason, I have run some more simulations and I am happy with the Cp I get most of the time if the initial conditions are OK. At least it seems to me to be close to the max value I obtained from the rigid simulations. I mean the Cp in Region 2 of variable speed control. I am attaching some plots ...

Dear dr Jonkman, Exactly, this is the reason for my initial question. While checking the differences I noticed I had the tip, hub and tower losses disabled in the simulation, and after enabling them the Cp is much closer at 0.4533 so I would say this solves my problem. Thank you for your suggestion!...

Dear dr Jonkman, It was a typo. the Cp is 0.467. Which is close to my maximum Cp 0.452 and I was unsure of where this difference could come from. I am running simulations with steady wind for example 6 m/s, in order to let the turbine settle and use the steady state displacements of the platform as ...

Dear Deniz, dr Jonkman, I greatly appreciate your help so far! I have been running some mere simulations of my model and come across an issue: These simulations were meant to generate a set of initial conditions for different wind speeds, that I would use later. I was looking for platform displaceme...

Dear Deniz,

This is very nice of you. I'll have a look. I hope your controller turns out super!
By the way, which generator model is used in the base controller for CART turbine? Is it the simple model or rather the Thevenin equivalent circuit model?

BS