Dear Francesca,
I wasn’t the one who originally derived the distributed tower properties of the WindPACT 1.5-MW baseline wind turbine supplied with the FAST archive. Instead, these came from data supplied by GEC (one of the leads on the WindPACT studies). I quickly checked the source of the distributed tower properties and see that they were derived from slightly different values of the diameter/thickness than you report. Here are the values that were used:
base diam = 5.61 m
top diam = 2.82 m
base thickness = 0.01756 m
top thickness = 0.00882 m
The other values you report, including the flexible tower height and steel properties are the correct, except that the density was increased by 5% to account for paint, bolts, flanges, etc. that are not accounted for in the thickness data.
Table 6-2 in the “WindPACT Turbine Rotor Design Study” refers to configuration 1.5A08C01V03cAdm. The version used to derive the WindPACT 1.5-MW model supplied with the FAST archive was configuration 1.5A08V07adm, which is a newer version according to the configuration ID described in Table 2-4 of the same report. I’m not sure why the report lists properties of an older version.
I haven’t checked all of the equations in your attachment, but hopefully the changes in tower values described above will enable you to reproduce the distributed tower properties supplied with the FAST archive.
Best regards,