### EOG with IECWind v5.01.02

Posted:

**Sat Oct 05, 2019 2:10 am**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 is my calculation:

Sigma1 = Iref*(0.75*Vhub+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?

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):

Code: Select all

`!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*(0.75*Vhub+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?