Dear Jason,
Within the technical report you wrote called ‘Dynamics Modeling and Loads Analysis of an Offshore Floating Wind Turbine’ published in 2007, which utilizes the NREl 5MW turbine, you state that for the pitch to stall analysis you smoothed the airfoil-data coefficients near stall to eliminate the existing fluctuations that could have led to numerical problems in the BEM aerodynamic-induction solution algorithm. You did this by modified the airfoils by manually manipulating the lift coefficients.
Would it be possible to get the values of the changes you made?
Also has any further work been done on a stall operated blade for the NREL 5MW turbine, or are there airfoils that you could recommend for the NREL 5MW turbine operating in active pitch to stall control?
Thanks,
Dawn