Blades modeling considerations when tuning ROSCO

[lucpavonese]

Hello there,

My first question is related to the flexibility. Is it considered during the tuning process or are the blades considered only as rigid bodies?

Secondly, are the blade inertia properties taken into account at any point or only the aerodynamic forces are considered? I ask this as in openFAST you have two parameters that could be represented for the thrust force, the first being "RtAeroFxh" which considers only the aerodynamic thrust, and the second being "RotThrust", which is the force at the low-speed shaft that also includes the rotor inertia forces. So, my question is, are the blade inertia forces considered for the tuning or we are only considering the aerodynamic forces?

Cheers!

[dzalkind]

Hello,

Blades are considered rigid bodies during the tuning process. Flap and twist deflection are not accounted for in the Cp surface used to tune the ROSCO speed controllers; this could be improved.

Blade inertia is part of the total rotor inertia used by the ROSCO tuning process.

The thrust coefficient surface used to tune the ROSCO peak shaving method only considers aerodynamic thrust. It does not use either of the OpenFAST channels you suggest, but a standalone BEM solver cc-blade.

I hope this helps!

Best, Dan