I am a master student in geotechnical engineering from TU DELFT doing my thesis on the seismic response of offshore wind turbines in sandy soils in Japan.
My question is if Fast can generate wind/wave loads on my structure from the spectra.
Thank you very much and have a nice day,
I’m sorry, but I’m not sure I understand your question. Is your question, “can I simulate an offshore wind turbine with combined wind + wave + seismic loading?” Or is your question, “can I derive wind and wave loads from user-defined spectra?” Or is your question something else?
First of all thank you for taking the time to read my question and reply.
My question is “Can I derive wind and wave loads from user-defined spectra”. I would like to input the spectra applicable to the East Coast of Japan and get the loads from there.
My goal with FAST is to obtain the wind/wave loads on my structure, that I can later import into Opensees to run my analysis.
For the seismic loading, I got accelerograms from the strong motion database of Japan.
I will initially do an analysis where only seismic loading is present, followed by an analysis where seismic loading is present together with wind and wave loading.
I would like to stress out that the analysis will be run in Opensees, not in FAST, my reason for using FAST being strictly to obtain the wind/wave loads on the structure.
I apologise for being unclear, I am still a rookie in the offshore field (did my Master’s in geotechnical engineering, and doing my thesis in offshore geotechnical engineering).
Your help is greatly appreciated.
You can generator turbulent wind based on a user-specified wind spectra using the TurbSim v2.00, available from here: nwtc.nrel.gov/alphas. See the associated TurbSim User’s Guide and CertTest for documentation and examples.
You can generate irregular waves based on user-specified wave spectra using the WaveMod = 4 option in the HydroDyn module of FAST, which requires you to implement you own spectra in routine UserWaveSpctrm and recompile FAST.
Thank you very much for the help!