Live wind

1 Live controls

The live wind option gives you the option to change the wind characterictics while the simulation is running. This is done by changing the values in the live controls box shown in the image below:



Some parameters cannot be changed live and have to be changed on the Properties tab. These parameters are listed below.

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. 

IHub 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