Ambient TI not updated during wake-added TI calculations?

[mr483]

It appears that in the current Crespo-Hernandez wake-added turbulence model, when I step-through the calculations, I notice that the ambient turbulence intensity remains constant throughout TI calculations at each turbine. Looking at the sequential solver: Once the wake-added TI's are computed for each turbine, the flow field is finally updated (line 209). However, while iterating through turbines and calculating their wake-added TI, the same initial ambient TI (set at line 65) is utilized. Is this correct?

If so, why isn't the ambient TI updated based on the already-calculated effect of further upstream turbines? E.g., if you have a row of 3 perfectly aligned turbines (1 -> 2 -> 3 upstream to downstream), and you are now calculating the wake-added turbulence of turbine 2, wouldn't the ambient TI from turbine 2 already be the sum-of-squares combination of the freestream ambient TI and the wake-added TI from turbine 1?