WindRose Command

WindData.WindRose(Tag, WindDayClassList=None, WindNightClassList=None, AlphaCOEFlist=None, DayWindSpeedList=None, DayWindFreqMatrix=None, NightWindSpeedList=None, NightWindFreqMatrix=None)

This module contains several inputs that can directly be inserted among object definition that is tough and is not suggested.

Argument	Type	Description
Tag	int	Unique integer value that will be used for referring to the defined elements or objects.
WindDayClassList	list of str	Specifies list of the wind classes corresponding to each wind speed range in windSpeedList in day.
WindNightClassList	list of str	Specifies list of the wind classes corresponding to each wind speed range in windSpeedList in night.
AlphaCOEFlist	list of float	Specifies list of the wind height alpha coefficient corresponding to each wind speed range in windSpeedList.
DayWindSpeedList	list of float	List of wind speed corresponding to each direction for day.
DayWindFreqMatrix	nested lists of float	A list of wind speed probabilities that for each direction divided to the probabilities of corresponding wind speed range defined in wind list for day.
NightWindSpeedList	list of float	List of wind speed corresponding to each direction for night.
NightWindFreqMatrix	nested lists of float	A list of wind speed probabilities that for each direction divided to the probabilities of corresponding wind speed range defined in wind list for night.

Note

Attention that the lists in WindFreqMatrix considered for each direction and the first list is for north direction and consider as zero degree.

Example:

As said, defining all above parameters while defining the wind rose object is tough and author suggests that define step by step as shown in the following. The below values are according to the example of chapter 7 of Casal book [Ref.1] :

Python Code

import opensrane as opr

#Define Wind Rose with Tag=1 and store the wind rose object in a variable (windobj)
windobj=opr.WindData.WindRose(1)

#define wind classes
windobj.WindDayClassList=['F','D','B','E','D','D']
windobj.WindNightClassList=['F','D','B','E','D','D']

#define AlphaCOEFlist
windobj.AlphaCOEFlist=[0.6,0.25,0.15,0.4,0.25,0.25]

#define Wind speeds list
windobj.DayWindSpeedList=[
[1,2],[2,3],[3,5],[5,7],[7,9],[9]]

windobj.NightWindSpeedList=[
[1,2],[2,3],[3,5],[5,7],[7,9],[9]]

#Define wind probabilities for Day and night for each direction and corresponding to the wind speeds

windobj.DayWindFreqMatrix=[
[0.446,0.372,0.355,0.109,0.017,0],
[0.44,0.938,1.55,0.755,0.097,0.029],
[0.898,1.321,3.06,1.402,0.767,0.892],
[0.875,1.241,2.626,1.51,0.892,0.646],
[0.801,0.927,1.63,0.658,0.355,0.097],
[0.87,1.121,0.984,0.309,0.023,0.029],
[0.778,0.801,0.91,0.315,0.029,0],
[0.652,0.875,1.35,0.498,0.086,0.023],
[0.566,0.887,1.659,0.709,0.149,0],
[0.583,0.807,2.128,2.998,1.041,0.137],
[0.898,1.093,2.408,2.059,1.327,0.154],
[1.985,2.088,2.488,1.098,0.332,0.069],
[4.067,3.123,1.442,0.292,0.063,0.011],
[3.93,5.372,3.85,1.201,0.349,0.057],
[1.71,1.619,2.38,0.767,0.109,0.006],
[0.698,0.469,0.383,0.154,0.011,0],]

windobj.NightWindFreqMatrix=windobj.DayWindFreqMatrix

The results are shown in the following figure:

[Ref.1]

J. Casal, Evaluation of the Effects and Consequences of Major Accidents in Industrial Plants, vol. 8. 2018.

Code Developed by: Bijan Sayyafzadeh