EOG with IECWind v5.01.02

Hi,
I am a little bit confused because the gustoutput from IECWind v5.01.02 and my calculations are showing differences.

The “IEC.ipt” whih is included in IECWind with give me this result for EOGR-2.0 (8m/s):

!This file was generated by IECwind v5.01.02 (13-Sep-2012). ! Wind condition defined by IEC 61400-1 3rd EDITION. ! for IEC Turbine Class 2 and IEC Turbulence Category b !---------------------------------------------------------- ! Rotor diameter = 80.0 m. ! 80.0 m hub-height yields 42.0 m turbulence scale. !---------------------------------------------------------- ! IEC Condition: Extreme Operating Gust. ! Stats for this wind file: ! The transient occurs over 10.5 seconds. ! ! The maximum gust speed is 3.331 m/s. ! The maximum total wind speed is 11.331 m/s. ! This maximum occurs at 45.250 seconds. ! ! The wind inflow inclination angle is 0.0 degrees to the horizontal.

This is my calculation:

Sigma1 = Iref*(0.75Vhub+b) = 0.14(0.75*8+5.6) = 1.62 m/s
Vgust = 3.3 (Sigma1/(1+0.1(D/Lambda1))) = 3.3 (1.62/(1+0.1(80/42))) = 4.5 m/s

The other Vgust formula is higher then this one, thats why i only write the formula.

Can someone see the failure?

Found the problem:

Greetings,
Your study on EOG in IECWind was helpful. Is there any means to simulate EOG50 (i.e.) with 50 years recurrence time period using IECWind?
Thanks in advance.
With regards,
Akheel

Dear Akheel,

What do you mean by EOG50, which is not defined in the IEC design standards?

Best regards,

Greetings Sir,
Thanks for your response.
I have been referring to IEC 61400-1(ed 2) in which DLC 1.6 is of extreme operating gust with a recurrence of 50 years, which I mentioned as EOG50.
With regards,
Akheel

Dear Akheel,

Actually, I’m not very familiar with Ed. 2 of IEC 61400-1. I guess the version of IECWind that I sent you in the following forum topic solves your issue: https://forums.nrel.gov/t/iecwind-previous-version/2978/3; is that correct?

Best regards,

Greetings Sir,
Thanks for your reply. Yes, the file (IECWind_v4) you sent through mail, solved the issue.
Thanks again.
With regards,
Akheel