Dear Hieu,
To model an idling rotor in FAST with AeroDyn, specify the following inputs:
In FAST’s primary input file:
PCMode = 0 (disable pitch control)
GenTiStr = True
TimGenOn = 9999.9 (a large don’t care > TMax)
BlPitch1 = BlPitch2 = BlPitch3 = 90.0 (fully feathered)
RotSpeed = 0.0 (or close to zero)
In AeroDyn’s primary input file:
StallMod = STEADY (disable dynamic stall, which isn’t valid at large angles of attack)
IndModel = NONE (disable aerodynamic induction)
More advice is given in the “Simulating Special Events” Section of the “Controls” Chapter of the FAST User’s Guide.
Best regards,