Wrong results when the wind is blowing through the back of rotor

[mah92]

Hi
Trying to model a T-motor quad-rotor blade, I have encountered problems when the wind is blowing through the back of the blade.
The problem is that the thrust goes to negative values suddenly after the wind direction is changed through the top to the bottom of rotor disk(which is not happening in reality).
Even with negligible wind speed, the results show meaningless fluctuations (I could not set the wind speed to zero due to numerical issues).
I have attached the rotor geometry and the results.
Thanks in advance


geometryAndOutputs.zip

[mah92]

The problem persists even when reversing the front direction, or by using SimpleAF