FAST-SC Program

Dear Jason,

I found several interesting papers on the topic of structural control of wind turbines. According to the paper “Passive structural control of offshore wind turbines” from University of Massachusetts Amherst, the authors, based on FAST, developed a program called FAST-SC which incorporated tuned mass dampers into the modeling of wind turbines. I feel this work is sensible and attractive, and I am wondering whether this program can be downloaded from NREL software center, or I should contact the authors directly for further information. Thanks.

Kind regards,
Yulin

Dear Yulin,

NREL hasn’t had the resources to migrate the FAST-SC features into the version of FAST that we support through this website. But this merging is something we’d like to do and will do when we get the resources. In the meantime, I suggest you contact the authors of a paper to see if they’ll supply you a copy. NREL provided guidance on the development of FAST-SC, so, we are quite confident about its correctness; we’ve also heard that new features are currently being added to FAST-SC.

Best regards,

Thanks a lot, Jason~ I have tried to contact the author of the program. I will let you know if I get any response~

Dear Yulin and Mr. Jason;

I contacted to the author of FAST-SC program (Dr. Lackner); he is a very honorable and respectful person;
First he gave me a portable version of the program and after a while he decided to give the source files in the access of public;
So he gave me this address for anyone who was looking for the software:
umass.edu/windenergy/researc … fastsc.php
Hope it would be useful for you;

Hi Hamid,

I strongly suggest that you study Jason Jonkman’s PHD dissertation carefully first, as well as FAST & AeroDyn user’s guides.

Regards,
Mehdi,

Dear Hamid Hokmabady,

The ability to model offshore wind turbines was added with the inclusion of the HydroDyn module in FAST v7.00.00a-bjj and newer available from here: wind.nrel.gov/designcodes/simulators/fast/. HydroDyn is currently included as an undocumented feature in FAST (see the HydroCalc.f90 source file). HydroDyn in its present form can be used to model fixed-bottom monopile support structures, as well as floating wind systems with taut or catenary moorings. HydroDyn has been tested by many users, so while the code is currently undocumented, it is well tested. We are in the process of reworking HydroDyn so that it (1) is a stand-alone module that can be called by a variety of structural codes and (2) can be applied to multi-member fixed-bottom systems (e.g., jackets and tripods). We plan to verify the multi-member modeling functionality in the OC4 project and validate the floating functionality through several code-to-experiment projects we’re involved in. We don’t plan to release a user’s guide until this version is complete, probably a few months from now.

For floating platforms, the new hydrodynamics and mooring system theories are well documented in my 2009 Wind Energy journal article and 2007 PhD thesis-turned NREL report: nrel.gov/docs/fy08osti/41958.pdf. As you’ll see by reviewing these papers, the hydrodynamic properties of the floater are defined through application of WAMIT or an equivalent panel code as a preprocess. The floating platform hydrodynamics calculations include regular or irregular linear waves and include radiation loads, diffraction loads, hydrostatic loads, and viscous drag loads.

There are several HAWT models you can use to start playing with the new offshore features if you are interested. In addition to the 17 sample wind turbine models (all onshore) provided in the archive of FAST v7.02.00d-bjj, five models of the NREL 5-MW baseline wind turbine are available from here: wind.nrel.gov/public/jjonkman/NR … rBsline5MW. These models include, the (1) onshore version of the 5-MW turbine, (2) the 5-MW turbine installed on a fixed-bottom monopile with rigid foundation in 20 m of water, (3) the 5-MW turbine installed on the floating ITI Energy barge (the floating platform I analyzed in my Ph.D. project), (4) the 5-MW turbine installed on a floating Tension Leg Platform, and (5) the 5-MW turbine installed on a floating spar-buoy (based on the OC3 project’s modifications to the Hywind concept). The archive for the model of the onshore version of the NREL 5-MW wind turbine includes a report that documents the turbine. The OC3 model requires a slightly customized version of HydroDyn, so, this model comes with its own FAST executable; this model also comes with a report that documents the platform.

Each of these models contains a torque and pitch controller in GH Bladed-style DLL format. These controllers require FAST’s interface to GH Bladed-style DLLs, which is not a default option in FAST v7.02.00d-bjj You can find a version of FAST with this interface here: wind.nrel.gov/public/jjonkman/FA … erface.exe. Or if you’re adventurous, you can recompile FAST yourself.

All of the new offshore-related (hydrodynamic and mooring system) inputs are contained in the updated platform input files.

Best regards,

Dear all
Is the FAST input files of OC4-DeepCwind concept available at the moment.
Best regards

Dear Hamid

Thanks for your information. I was also informed by Dr. Lackner about the release of FAST-SC. It is very useful to attract more research effort in this direction, and I will keep following this line. Good luck.

Best regards
Yulin

Dear Liang,

Please find an answer to your question in the following forum topic: http://forums.nrel.gov/t/oc4-deepcwind/692/1.

Best regards,

Dear Mr. Jonkman
Thank u so much for all of your answers.

Best
Hamid