Dear Thomas,
You may be able to estimate the value of LUlt, but to truly calculate it for a complex airfoil cross section you’d have to use a sectional analysis tool. See related topics regarding LUlt on this forum for further discussion e.g.:
Dear Bruno,
Unfortunately, the NWTC Information Portal has crashed and is no longer available, and there is a bit of gap before the new website becomes live–see the following announcement for more information: Other News .
Regardless, here is what the old FAQ said regarding the question, “What values do I use for TypeLMF and LUlt in my MCrunch and MLife input files?”:
Until the new website becomes live, I’ve temporarily places the MExtremes (as well as MCrunch and MLife) download(s) here: win…
Dear Conor,
Just to be clear, the OC3-Hywind specifications report (nrel.gov/docs/fy10osti/47535.pdf ) gives the Young’s modulus (E) of the tower as 210 GPa; however the yield strength (sigma_yield = E*epsilon_yield, where epsilon_yield is the axial strain at the yield strength) is not given in that report. I misread your post and was simply using your value. You’ll have to make your own assumptions on sigma_yield for your own purposes.
Here are the basic equations for LUlt for a thin-walled …
Best regards,