Axial Induction for a given turbine v3

[JackDI1]

Hi all,

I am attempting to calculate the wake centerline for each turbine in a 3x3 wind farm using the Empirical Gauss deflection model (v3). The arguments of this require the thrust coefficient and the wake-induced mixing term for the ith turbine. The trust coefficient I have managed to get using get_turbine_Cts(), and it looks like I need to use the wake induced mixing function here to get the mixing function for the turbine, but this requires the Axial induction factor of the ith turbine as an argument. I can't seem to work out how to get this value from floris, can someone please point me in the right direction?

If anyone has an alternative method of calculating the wake centerline I would also be interested to hear that!

Thanks,
Jack

[misi9170]

Hi @JackDI1 ,

To get the axial induction factors, use the get_turbine_ais() method of the FlorisInterface.

However, you could also use the sample_flow_at_points() method of the FlorisInterface, and set the x, y, z array arguments to be locations along the wake centerline, to get the flow velocities without needing to explicitly compute the thrust coefficients and axial induction factors. See also v3 example 28 for example code.

[JackDI1]

Ah, not sure how I missed that!! Thank you!

[misi9170]

For future reference for anyone looking at this thread, in FLORIS v4, the equivalent methods are:

• get_turbine_thrust_coefficients()
• get_turbine_ais()
  or
• sample_flow_at_points()

and an example demonstrating the use of sample_flow_at_points() is examples_get_flow/002_extract_wind_speed_at_points.py.