utils

off.utils.lg = <Logger off.utils (WARNING)>

Utilities for the OFF toolbox functions which are handy in multiple places but do not have a true parent object they could belong to.

off.utils.ot_abs2uv(wind_speed_abs, wind_dir) → ndarray
off.utils.ot_abs_wind_speed(u, v) → float
off.utils.ot_deg2rad(deg) → float
off.utils.ot_get_closest_2_points_3d_sorted(ref_loc: ndarray, points: ndarray) → List[int]

Function to find the index of the closest 2 points to a reference location in 3D. The function can expect the list of points to be sorted / trailing each other.

Parameters:

  • ref_loc – [1 x 3] np.ndarray Reference location

  • points – [n x 3] np.ndarray Points

Return type:

[1 x 2] int array

off.utils.ot_get_closest_point_3d_sorted(ref_loc: ndarray, points: ndarray) → int

Function to find the index of the closes point to a reference location in 3D. The function can expect the list of points to be sorted / trailing each other.

Parameters:

  • ref_loc – [1 x 3] np.ndarray Reference location

  • points – [n x 3] np.ndarray Points

Returns:

index

Return type:

int

off.utils.ot_get_orientation(wind_dir: float, yaw: float) → float

Return the turbine orientation based on the wind direction and the yaw angle

Parameters:

  • wind_dir (float) – Wind direction in LES degree (270 deg pointing along the x-axis, 190 deg along the y axis)

  • yaw (float) – Yaw angle in degree

Returns:

Orientation in LES degree

Return type:

float

off.utils.ot_get_yaw(wind_dir: float, orientation: float) → float

Return the turbine yaw angle based on the wind direction and turbine orientation

Parameters:

  • wind_dir (float) – Wind direction in LES degree (270 deg pointing along the x-axis, 190 deg along the y axis)

  • orientation (float) – Turbine orientation in LES degree (270 deg pointing along the x-axis, 190 deg along the y axis)

Returns:

yaw angle in LES degree (clockwise)

Return type:

float

off.utils.ot_isocell(n_rp: int) → tuple

Isocell algorithm to discretize the rotor plane (or any circle) Masset et al.

https://orbi.uliege.be/bitstream/2268/91953/1/masset_isocell_orbi.pdf

We choose N = 3 here, 4 or 5 are also viable options, 3 is close to optimal

Parameters:

n_rp (int) – desired number of Rotor points (algorithm can not work with all numbers, takes the closest one)

Returns:

[yRP, zRP] : np.ndarray location of the rotor points with values between -0.5 and 0.5 w : float weight of the RPs (1/number)

Return type:

tuple

off.utils.ot_uv2abs(u, v) → float
off.utils.ot_uv2deg(u, v) → float