Turbine turbulence intensity

[rafmudaf]

It looks like turbulence intensity is unnecessarily tied to the Turbine object. Line 193 in FlowField sets the turbulence intensity for each turbine and then calls the turbine's calculate_turbulence_intensity function at line 274. Furthermore, the definition of that function in Turbine line 218 calls for three unique turbulence intensities:

• flow_field_ti
• wake model's initial ti
• turbulence intensity at the turbine

What are the distinctions between these turbulence intensities, can we make this simpler, and is it used correctly at the moment since flow_field_ti and turbine.turbulence_intensity are ultimately the same?