Wind turbine

Here is a list of the variables available in Meso-NH when wind turbines are simulated.

  • ‘R’ stands for the number of rotors (wind turbines).

  • ‘B’ stands for the number of blades for one rotor.

  • ‘AE’ stands for the number of azimutal elements of the rotor.

  • ‘RE’ stands for the number of radial elements of a blade.

  • ‘3’ stands for the three component of the vecteur (x,y,z).

  • The ‘global frame’ denotes the coordinate system of Meso-NH.

  • The ‘hub frame’ the coordinate system linked to the hub.

  • The ‘blade element frame’ the coordinate system linked to a blade element.

  • The ‘relative frame’ the aerodynamic coordinate system linked to the relative wind speed.

See the Scientific documentation for more details. The mean values of variables are computed between two backup outputs.

Main variables

LMAIN_EOL=T

Name

Dimension

Meaning

Units

FX_RG

[x,y,z]

X-component field of aerodynamic force (wind$rightarrow$rotor) in global frame

N

FY_RG

[x,y,z]

Y-component field of aerodynamic force (wind$rightarrow$rotor) in global frame

N

FZ_RG

[x,y,z]

Z-component field of aerodynamic force (wind$rightarrow$rotor) in global frame

N

FX_SMR_RG

[x,y,z]

X-component field of smeared aerodynamic force (wind$rightarrow$rotor) in global frame

N

FY_SMR_RG

[x,y,z]

Y-component field of smeared aerodynamic force (wind$rightarrow$rotor) in global frame

N

FZ_SMR_RG

[x,y,z]

Z-component field of smeared aerodynamic force (wind$rightarrow$rotor) in global frame

N

Non-Rotating Actuator Disc (ADNR)

Instantaneous variables

LMAIN_EOL=T and CMETH_EOL='ADNR'

Name

Dimension

Meaning

Units

A_INDU

[R]

induction factor

CT_D

[R]

thrust coefficient at disc ($C_{t_d} neq C_{t_infty}$)

THRUT

[R]

instantaneous thrust (wind$rightarrow$rotor) in hub frame

N

Averaged variables

LMAIN_EOL=T, CMETH_EOL='ADNR' and LMEAN_FIELD=T

Name

Dimension

Meaning

Units

THRUMME

[R]

averaged thrust (wind$rightarrow$rotor) in hub frame

N

Rotation Actuator Disc (ADR)

Instantaneous variables

LMAIN_EOL=T and CMETH_EOL='ADR'

Name

Dimension

Meaning

Units

ELT_RAD

[R,AE,RE]

radial position of an element (0m at hub)

m

ELT_AZI

[R,AE,RE]

azimutal angle of an element

rad

AOA

[R,AE,RE]

instantaneous angle of attack

rad

AOA_BLEQ

[R,RE]

blade equivalent instantaneous angle of attack

rad

FLIFT

[R,AE,RE]

instantaneous lift force in relative frame

N

FDRAG

[R,AE,RE]

instantaneous drag force in relative frame

N

FAERO_RA

[R,AE,RE,3]

instantaneous aerodynamic force in annular element frame

N

FAERO_RG

[R,AE,RE,3]

instantaneous aerodynamic force in global frame

N

FAERO_BLEQ_RA

[R,RE,3]

blade equivalent instantaneous aerodynamic force in annular element frame

N

THRUT

[R]

instantaneous thrust (wind$rightarrow$rotor) in hub frame

N

TORQT

[R]

instantaneous torque (wind$rightarrow$rotor) in hub frame

Nm

POWT

[R]

instantaneous power (wind$rightarrow$rotor)

W

OMEGAT

[R]

instantaneous angular velocity

rad/s

PITCHT

[R]

instantaneous blade pitch

rad

AZIMUTHT

[R]

instantaneous angular position of the hub frame

rad

Averaged variables

LMAIN_EOL=T, 'CMETH_EOL='ALM' and LMEAN_FIELD=T

Name

Dimension

Meaning

Units

AOAMME

[R,AE,RE]

averaged angle of attack

rad

AOAMME_BLEQ

[R,RE]

blade equivalent averaged angle of attack

rad

FAEROMME_RA

[R,AE,RE,3]

averaged aerodynamic force in annular element frame

N

FAEROMME_BLEQ_RA

[R,RE,3]

blade equivalent averaged aerodynamic force in annular element frame

N

THRUMME

[R]

averaged thrust (wind$rightarrow$rotor) in hub frame

N

TORQMME

[R]

averaged torque (wind$rightarrow$rotor) in hub frame

Nm

POWMME

[R]

averaged power (wind$rightarrow$rotor)

W

OMEGAMME

[R]

averaged angular velocity

rad/s

PITCHMME

[R]

averaged blade pitch

rad

Actuator Line Method (ALM)

Instantaneous variables

LMAIN_EOL=T and 'CMETH_EOL='ALM'

Name

Dimension

Meaning

Units

ELT_RAD

[R,B,RE]

radius (0m at hub)

m

AOA

[R,B,RE]

instantaneous angle of attack

rad

FLIFT

[R,B,RE]

instantaneous lift force in relative frame

N

FDRAG

[R,B,RE]

instantaneous drag force in relative frame

N

FAERO_RE

[R,B,RE,3]

instantaneous aerodynamic force in blade element frame

N

FAERO_RG

[R,B,RE,3]

instantaneous aerodynamic force in global frame

N

THRUT

[R]

instantaneous thrust (wind$rightarrow$rotor) in hub frame

N

TORQT

[R]

instantaneous torque (wind$rightarrow$rotor) in hub frame

Nm

POWT

[R]

instantaneous power (wind$rightarrow$rotor)

W

OMEGAT

[R]

instantaneous angular velocity

rad/s

PITCHT

[R]

instantaneous blade pitch

rad

AZIMUTHT

[R]

instantaneous angular position of the hub frame

rad

Averaged variables

LMAIN_EOL=T, 'CMETH_EOL='ALM' and LMEAN_FIELD=T

Name

Dimension

Meaning

Units

AOAMME

[R,B,RE]

averaged angle of attack

rad

FAEROMME_RE

[R,B,RE,3]

averaged aerodynamic force in blade element frame

N

THRUMME

[R]

averaged thrust (wind$rightarrow$rotor) in hub frame

N

TORQMME

[R]

averaged torque (wind$rightarrow$rotor) in hub frame

Nm

POWMME

[R]

averaged power (wind$rightarrow$rotor)

W

OMEGAMME

[R]

averaged angular velocity

rad/s

PITCHMME

[R]

averaged blade pitch

rad

Controller variables

LMAIN_EOL=T, LCONTROL_EOL=T, CMETH_OPS='JONKM', 'CMETH_EOL='ALM' or 'ADR'

Name

Dimension

Meaning

Units

REGION_JONKM

[R]

Which of the 5-region is currently used for rotational velocity control

OMEGA_FILTERED

[R]

Current filtered rotational velocity

rad/s

TORQUE_GEN

[R]

Current generator torque

Nm

OMEGA_GEN

[R]

Current generator rotational velocity

rad/s

OMEGA_ERROR_INTEG

[R]

Current integrated error on rotational velocity

rad

LMAIN_EOL=T, LCONTROL_EOL=T, CMETH_OPS='ROSCO', 'CMETH_EOL='ALM' or 'ADR'

Name

Dimension

Meaning

Units

REGION_ROSCO

[R]

Which of the 5-region is currently used for rotational velocity control

TORQUE_GEN

[R]

Current generator torque

Nm

OMEGA_GEN

[R]

Current generator rotational velocity

rad/s

GENF_INLAST1

[R]

Last input omega generator 1 [2nd order filter]

rad/s

GENF_INLAST2

[R]

Last input omega generator 2 [2nd order filter]

rad/s

GENF_OUTLAST1

[R]

Last output omega generator 1 [2nd order filter]

rad/s

GENF_OUTLAST2

[R]

Last output omega generator 2 [2nd order filter]

rad/s

TORQF_INLAST1

[R]

Last input torque generator 1 [2nd order filter]

Nm

TORQF_INLAST2

[R]

Last input torque generator 2 [2nd order filter]

Nm

TORQF_OUTLAST1

[R]

Last output torque generator 1 [2nd order filter]

Nm

TORQF_OUTLAST2

[R]

Last output torque generator 2 [2nd order filter]

Nm

GENARTQ_PII

[R]

Integral term PI omega generator Above rated

Nm

GENBRTQ_PII

[R]

Integral term PI omega generator Below rated

Nm

PITCH_PII

[R]

Integral term PI pitch

rad

Time-dependent variables

These variables are available in the diachronic file under the subgroup ‘Wind_turbines’, which itself contains one subgroup per wind turbine. These outputs can be activated with variable LDIA_EOL in NAM_EOL.

Name

Dimension

Meaning

Units

THRUST

[t]

Thrust (wind$rightarrow$rotor) in hub frame

N

TORQUE

[t]

Torque (wind$rightarrow$rotor) in hub frame

Nm

POWER

[t]

Power (wind$rightarrow$rotor)

W

OMEGA

[t]

Angular velocity

rad/s

PITCH

[t]

Blade pitch

rad

AZIMUTH

[t]

Angular position of the hub frame

rad

Controller

LMAIN_EOL=T, LCONTROL_EOL=T, CMETH_OPS='ROSCO' or 'JONKM', 'CMETH_EOL='ALM' or 'ADR'

Name

Dimension

Meaning

Units

REGION

[t]

Which of the 5-region is currently used for angular speed control

GEN_TORQUE

[t]

Current generator torque

Nm

GEN_SPEED

[t]

Current generator rotational velocity

rad/s

Floating wind turbine

Additionally, if LFLOAT_EOL=T , the 6-DOF velocities and positions of the floater are available:

Name

Dimension

Meaning

Units

FLOAT_SURGE_POS

[t]

Floater relative surge position speed

m

FLOAT_SWAY_POS

[t]

Floater relative sway position

m

FLOAT_HEAVE_POS

[t]

Floater relative heave position

m

FLOAT_ROLL_POS

[t]

Floater relative roll position

rad

FLOAT_PITCH_POS

[t]

Floater relative pitch position

rad

FLOAT_YAW_POS

[t]

Floater relative yaw position

rad

FLOAT_SURGE_VEL

[t]

Floater surge velocity

m/s

FLOAT_SWAY_VEL

[t]

Floater sway velocity

m/s

FLOAT_HEAVE_VEL

[t]

Floater heave velocity

m/s

FLOAT_ROLL_VEL

[t]

Floater roll velocity

rad/s

FLOAT_PITCH_VEL

[t]

Floater pitch velocity

rad/s

FLOAT_YAW_VEL

[t]

Floater yaw velocity

rad/s

High-frequency outputs

If at least one field is requested in NAM_OUTPUT (for instance, UT) and if LMAIN_EOL=T, then the high-frequency output files will automatically contain:

Name

Dimension

Meaning

Units

THRUT

[t]

Thrust (wind$rightarrow$rotor) in hub frame

N

TORQT

[t]

Torque (wind$rightarrow$rotor) in hub frame

Nm

POWT

[t]

Power (wind$rightarrow$rotor)

W

OMEGAT

[t]

Angular velocity

rad/s

PITCHT

[t]

Blade pitch

rad

AZIMUTHT

[t]

Angular position of the hub frame

rad

Additionally, with LMAIN_EOL=T, LCONTROL_EOL=T, CMETH_OPS='ROSCO' or 'JONKM'

it also contains:

Name

Dimension

Meaning

Units

REGION

[R]

Which of the 5-region is currently used for angular speed control

m

TORQUE_GEN

[R]

Current generator torque

Nm

OMEGA_GEN

[R]

Current filtered generator rotational velocity

rad/s

Finally, if LMAIN_TRACER=T, it also contains:

Name

Dimension

Meaning

Units

SVEOLT_001

[x,y,z]

Current concentration of turbine passive scalar number NEMITTING_ROT(1)

SVEOLT_{…}

[x,y,z]

Current concentration of turbine passive scalar number NEMITTING_ROT(…)

SVEOLT_00N

[x,y,z]

Current concentration of turbine passive scalar number NEMITTING_ROT(N) where N = NNB_EMITTING_ROT