Regarding Apparent Fixity model

Dear Sir

For the same wind and wave conditions, one would expect lower response from the OWT with increasing apparent fixity depth. However, for a HH wind speed of 30mps (idling rotor), I find that the FATBM is steadily increasing with increasing AF depth. My Hs and Tp values are 10m and 14s, respectively.

I have modelled the idling rotor in FASTv8, using the recommendations in the post Extreme events. I have used the default monopile OWT in FASTv8. Please help me diagnose the error.

Sincerely

Abhinav
FAST8_idle.zip (16.1 KB)