Unsteady aerodynamics versus steady aerodynamics

Wind & Water Computer-Aided Engineering Software Tools
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Dear @Jason.Jonkman ,

Hope you are doing well.

I wanna ask you whether NREL has made a comparsion between steady Blade Element Momentum Theory (BEMT) and the unsteady one focusing on the difference of aerodynamic loads?

In other terms, if i use steady BEMT instead of the unsteady one, am i doing a big mistake ?

Best Regards,

Riad

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Dear @Riad.Elhamoud,

Certainly we have done comparisons between BEMT and dynamic BEMT (DBEMT). Generally, DBEMT tends to smooth out loads a bit during transients (due to the low-pass filter implemented in DBEMT). E.g., BEMT tends to overpredict fatigue loads compared to DBEMT.

Best regards,

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