Stepped Wind |
 
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Stepped Wind |
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In the stepped wind test case, a time varying wind load is applied in a single continuous simulation. The time history of wind speed starts off with a magnitude of 4 m/s. This is simulated for a period which is sufficiently long to dissipate the effects of initial transients associated with turbine start-up (only the final 120 seconds of this stage is shown in the results section). Beyond this point, the wind speed magnitude is increased in steps of 1 m/s every 40 seconds, up to the cut-out speed of 25 m/s, providing a good test of the controller. The rotor is misaligned with the incoming wind flow, creating a horizontal skew angle of 30°. Results are presented in the form of time histories, for turbine performance and blade structural response.
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