Coupled vs uncoupled blade element momentum theory

Wind & Water Rotor Aerodynamics
1

Dear @Jason.Jonkman

Hope you are doing well.

I want to ask you how to enable coupled/uncoupled blade element moment in AeroDyn v4 ? or the uncoupled one was deprecated ?

Thank you in advance.

Best Regards,

Riad

2

Dear @Riad.Elhamoud,

Are you referring to the changes in AeroDyn introduced in OpenFAST v4? See the documentation here for the equivalencies between the old and new inputs: 4.1.2. API changes between versions — OpenFAST v5.0.0 documentation.

If you are specifically asking about the old and new SkewMod options, here are the equivalencies:
Old → New
SkewMod = 0 (orthogonal) → SkewMod = -1
SkewMod = 1 (uncoupled) → SkewMod = 0
SkewMod = 2 (Pitt/Peters) → SkewMod = 1 with SkewMomCorr = FALSE and SkewRedistr_Mod = 1
SkewMod = 3 (coupled) → This option has never been available

Best regards,

1 Like