Linear wind
Linear
Start speed
The start (initial) speed.
For more information on how the linear wind is computed, check the Linear wind section in the theory manual
- Default value: 3
- Unit: ${\text{m}} \over {\text{s}}$
- Range: -100 — 100
End speed
The end speed.
- Default value: 25
- Unit: ${\text{m}} \over {\text{s}}$
- Range: -100 — 100
Start angle
The start angle.
- Default value: 0
- Unit: $°$
- Range: -360 — 360
End angle
The ending angle.
- Default value: 0
- Unit: $°$
- Range: -360 — 360
Start-up duration
Duration until first speed/angle change
- Default value: 10
- Unit: $\text{s}$
- Range: 0 — 1e+06
Duration
Duration of the linear increase.
- Default value: 20
- Unit: $\text{s}$
- Range: 0.1 — 1e+06
Shear profile
Shear
Decides if a shear law is applied to the deterministic wind.
- Default value: False
- Unit: —
Power law exponent
The shear is computed using a power law. This is the power law exponent.
To see how the power law is computed, see Wind profile power law
- Default value: 0.2
- Unit: —
- Range: 0 — 100
Reference height scheme
This parameter lets your define whether the point of application of the reference speed (used to compute a vertical wind shear) is input by you or defined as the hub height. This parameter is only relevant if a shear law is applied to the wind.
If Hub height is selected, the reference wind speed for the shear will be applied at hub height. If the turbine has multiple rotors, the reference wind speed will be applied at the average hub height. If there is no rotor, the reference speed is applied at the average height of the nodes at sea level.
Options:
Hub height (default):
The reference height is set to the hub height.
User defined:
The reference height is set explicitly by the user (you).
Reference height
The height above the ground (or above sea level for offshore turbine) where the reference wind speed is applied.
Hub height is often used for the reference height, but in some cases it is convenient to use another height. E.g. if the wind speed is given for a height of 10 m above ground, then this parameter should be set to 10 m. Note: The reference height only has an influence if there is shear (see Wind profile power law)
- Default value: 10
- Unit: $\text{m}$
- Range: 0.01 — 1000