Dear Jonkson,

I have one question about the ‘NRELOffshrBsline5MW_AeroDyn.ipt’ file content. I know the ‘RNodes’ shoud be equal

RNodes(1) = HubRad + DRNodes(1)/2

RNodes(2) = RNodes(1) + ( DRNodes(1) + DRNodes(2) )/2

RNodes(i) = RNodes(i-1) + ( DRNodes(i-1) + DRNodes(i) )/2.

And I know the ‘FoilNm’ about aerodynamic data is according to the thickness chord ratio(for example “AeroData\DU40_A17.dat”,its aerodynamic data at the 40% thickness chord ratio station). My question is how to choose the ‘Nfoil’ parameters at every RNodes?(for example,when RNodes equal to 11.75,does the thickness chord ratio equal to 40%? Or just equal approximatively?). At every RNodes, does Nfoil correspond to the accurate thickness chord ratio airfoil aerodynamic data ? Should we calculate every RNodes station airfoil aerodynamic data ?

Best regards,