Aerodynamic Model

Wake Induction

$AERODYN -> *GENERAL -> WAKEMOD

BEMT, DBEMT or OLAF

None

None

Unsteady Aerodynamics

$AERODYN -> *UNSTEADY AEROFOIL AERODYNAMICS -> UA_MOD

Beddoes-Leishmann Gonzalez, Beddoes-Leishmann Minemma/Pierce, Beddoes-Leishmann HGM 4-States, Beddoes-Leishmann HGM+Vortex 5-States,  Oye or Boeing-Vertol.

Quasi-Steady

Quasi-Steady

Pitch Control

Pitch control mode

ServoDyn input file: PCMode

5 (User-defined from Bladed-style DLL)

0 (None)

0 (None)

Time to enable active pitch control

ServoDyn input file: TPCOn

0.0 s

N/A

N/A

Blade pitch control mode

Controller DLL input file: PC_ControlMode

1 (active PI blade pitch control)

0 (no pitch control)

0 (no pitch control)

Generator and Torque Control

Generator Speed Control

ServoDyn input file: VSContrl

5 (User-defined from Bladed-style DLL)

5 (User-defined from Bladed-style DLL)

0 (None)

Method to start the generator

ServoDyn input file: GenTiStr

True

False

N/A

Method to stop the generator

ServoDyn input file: GenTiStp

True

N/A

N/A

Generator speed to turn on the generator

ServoDyn input file: SpdGenOn

N/A

9999.9 (a large number)

N/A

Time to turn on the generator

ServoDyn input file: TimGenOn

0.0

N/A

N/A

Time to turn off the generator

ServoDyn input file: TimGenOf

9999.9 s (a large number)

N/A

N/A

Generator torque control mode

Controller DLL input file: VS_ControlMode

2 (WSE TSR Tracking)

0 (no torque control)

N/A

Structural Model

Initial Rotor Speed

Not possible to explicitly specify an initial rotor speed in Flexcom, so the rotor always starts with zero angular velocity.

Optionally run a pre-simulation with steady wind speed to allow rotor to achieve an initial speed. Alternatively just start from zero and ignore initial transients when post-processing.

0 rpm

0  rpm

Initial Pitch

$LOAD CASE -> *TWIST -> TYPE=CONSTANT

0.0 deg i.e. allow ServoDyn to automatically find the correct pitch. Use $LOAD CASE -> *SERVODYN -> FLEXCOM MANUAL OVERRIDE if you are experiencing issues with rotor overspeed.

-90 degrees

-90 degrees

Rotor Brake

$MODEL -> *LOCAL AXIS SYSTEM -> NAME=Shaft -> {Shaft_Front},LOCAL_X_NODE={Shaft_Back}

$LOAD CASE -> *BOUNDARY -> TYPE=LOCAL AXIS, AXIS=Shaft, MOTION=NODE -> {Shaft_Front},4

N/A

N/A

Apply rotor brake via local axis boundary condition