NWTC

Dear Nikhar, Thanks a lot for your reply. Like you recommended I continued to modify the floating feedback gain (Fl_Kp term). To investigate the ROSCO controller behavior on the floating system for different floating feedback gains, I performed platform pitch decay tests in constant wind and calm wa...

Dear NREL team, I am running aero-hydro-servo-elastic simulations of the 15MW NREL offshore reference wind turbine, using specific aero-elastic and hydrodynamic software. The aero-elastic software I use supports the bladed-style communication interface. Therefore I am using the ROSCO controller vers...

Dear Jason, Indeed, when I eliminate the shaft tilt (ShftTilt = 0) I get the expected result that RtAeroFxp equates to YawBrFxp. I guess I was concentrating too much on the RtAeroFxp while the RtAeroFyp and specifically the RtAeroFzp is contributing to the YawBrFxp as well due to the shaft tilt. The...

Dear NREL team, I am investigating the loads on the yaw bearing of the 15MW NREL reference turbine for a parked condition (not idling). For simplicity I neglected the floater motions and structural deformations of the wind turbine tower and wind turbine blades. I am running a simulation in a 52.1 m/...

Dear Nikhar, Thanks a lot for quick and helpful reply. The controller that I was using from https://github.com/IEAWindTask37/IEA-15-240-RWT/tree/master/OpenFAST/IEA-15-240-RWT-UMaineSemi/ServoData turned out to be outdated, indeed. Re-running the simulations with ROSCO v2.1.1 resulted in the expecte...

Dear NREL team, I am running openFAST simulations for the 15-MW reference wind turbine including wind turbine control (for floating applications) with a fully constrained floater and ignoring structural deformations of the wind turbine tower and wind turbine blades. Also, the tower drag loads are no...

Dear NREL team, I am running an openFAST simulation of the 15-MW offshore reference turbine in an under rated, rated and above rated turbulent condition (8, 10.6 and 14 m/s) generated with the use of Turbsim (V2.00.08 64-bit). For verification purposes, I fixed all translations and rotations of the ...