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UPWIND<br />
Appendix B – IEC 61400-3 Design Load Cases<br />
Operating conditions Power production<br />
Page 134 of 146<br />
DLC 1.2 – FATIGUE<br />
Wind conditions Normal turbulence model (NTM)<br />
Sea conditions Normal sea state (NSS), no currents, MSL + 10% of tidal range<br />
Partial safety factor 1.0<br />
Description of simulations:<br />
Filename<br />
Mean<br />
wind<br />
speed<br />
[m/s]<br />
Longit.<br />
turbulence<br />
intensity [%]<br />
Sig. wave<br />
height [m]<br />
Peak<br />
spectral<br />
period<br />
1.2a_x_y 4 20.4 1.17 5.55<br />
1.2b_x_y 6 17.5 1.25 5.6<br />
1.2c_x_y 8 16.0 1.33 5.67<br />
1.2d_x_y 10 15.2 1.75 5.71<br />
1.2e_x_y 12 14.6 2.4 5.88<br />
1.2f_x_y 14 14.2 2.8 6.07<br />
1.2g_x_y 16 13.9 3.2 6.37<br />
1.2h_x_y 18 13.6 3.7 6.71<br />
1.2i_x_y 20 13.4 4.4 6.99<br />
1.2j_x_y 22 13.3 5.1 7.4<br />
1.2k_x_y 24 13.1 5.3 7.8<br />
Comments<br />
[s]<br />
Time<br />
[hrs/year]<br />
See<br />
design<br />
basis [65]<br />
Wind-wavemisalignment<br />
[deg]<br />
0° – 150°<br />
(30° sectors)<br />
� 3D, 3-component Kaimal turbulent wind field (2 minutes sample)<br />
� 6 different wind speed (and wave) seeds for each wind speed bin<br />
� The first 18 runs are with a yaw error of +8 deg, the last 18 with -8deg per wind bin<br />
� The 6 seeds are 6 times re-used for each wind speed bin<br />
� x = 1-6 according to wind direction (0-150deg in 30deg steps)<br />
� y = 1-6 according to wave direction (0-150deg in 30deg steps)<br />
� log. vertical shear with ground roughness length of 0.002m<br />
� NTM is site specific<br />
� NSS with irregular waves defined using Jonswap spectrum (peakness = 1.0)<br />
� tidal range is equal to HAT – LAT, 10% = 0.22m
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