Dear FAST community,
I am quite new in FAST and I am currently modeling an offshore wind turbine with a monopile. I derived the eigenvalues and modes shapes using BModes and a distributed springs model but, for now, I would like to perform time-domain simulations and compare the values of the eigen frequencies I get, namely BModes with distributed springs vs. FAST with distributed springs or FAST with p-y curves.
However, I read (@ http://forums.nrel.gov/t/turbine-soil-interaction-influence-on-the-mode-shapes/481/1) it was not possible yet to run FAST with a distributed springs model or the p-y curves. I downloaded the .f90 file with the user-defined subroutine UserTwrLd but I would like to know what are the changes to be made in the source code of FAST for using this routine (distributed springs). In which file(s) must this routine be written, when must it be called?
The following step would be to incorporate the p-y curves (which I have, ie. table of values + graphs) in the code, but I guess I would need to create a loop in the source code for re-computing the loads. Shall you please help me with that?
Thanks a lot. Best regards,