4.18.12. List of Output Channels

This is a list of all possible output parameters available within FAST.Farm (except those that are available from OpenFAST, which are specified within the OpenFAST input file(s) and output separately for each turbine). The names are grouped by meaning, but can be ordered in the OUTPUTS section of the FAST.Farm primary input file as you see fit.

T\(\alpha\) refers to turbine \(\alpha\), where \(\alpha\) is a one-digit number in the range [1,9], corresponding to row \(\alpha\) in the wind turbine input table. If NumTurbines > 9, only values for the first 9 turbines can be output. Setting \(\alpha\) > NumTurbines yields invalid output.

In\(\zeta\) and Ot\(\zeta\) refer to super-controller input and output \(\zeta\), respectively, where \(\zeta\) is a one-digit number in the range [1,9], corresponding to element \(\zeta\) in the input and output arguments of the super-controller source code. If there are more than 9 elements, only values for the first 9 inputs and outputs can be output. Setting \(\zeta\) greater than the number of elements yields invalid output.

N\(\beta\) refers to radial output node \(\beta\), where \(\beta\) is a two-digit number in the range [01,20], corresponding to entry \(\beta\) in the OutRadii list, where node \(\beta\) is at radius dr \(\times\) OutRadii[\(\beta\)]. Setting \(\beta\) > NOutRadii yields invalid output.

W\(\eta\) refers to wind point \(\eta\), where \(\eta\) is a one-digit number in the range [1,9], corresponding to entry \(\eta\)in the WindVelX, WindVelY, and WindVelZ lists. Setting \(\eta\) > NWindVel yields invalid output. Setting WindVelX, WindVelY, and WindVelZ outside the low-resolution wind domain also yields invalid output.

\(\delta\) refers to the X, Y, or Z coordinate axis.

D\(\gamma\) refers to downstream distance \(\gamma\), where \(\gamma\) is a one-digit number in the range [1,9], corresponding to entry \(\gamma\) in the OutDist list. Setting \(\gamma\) > NOutDist yields invalid output. The output is also invalid if OutDist is a distance further downstream than the wake has been calculated or for any distance where the wake from the turbine has overlapped itself.

Table 4.18 List of Available FAST.Farm Output Channels

Channel Name	Units	Description
Super Controller
SCGblIn\(\zeta\)	(user)	Global (turbine independent) super controller input \(\zeta\)
SCT\(\alpha\)In\(\zeta\)	(user)	Turbine-dependent super controller input \(\zeta\) for turbine \(\alpha\)
SCGblOt\(\zeta\)	(user)	Global (turbine independent) super controller output \(\zeta\)
SCT\(\alpha\)Ot\(\zeta\)	(user)	Turbine-dependent super controller input \(\zeta\) for turbine \(\alpha\)
Wind Turbine and Inflow
RtAxs\(\delta\)T\(\alpha\)	(-)	Orientation of the rotor centerline for turbine \(\alpha\) in the global coordinate system
RtPos\(\delta\)T\(\alpha\)	(m)	Position of the rotor (hub) center for turbine \(\alpha\) in the global coordinate system
RtDiamT\(\alpha\)	(m)	Rotor diameter for turbine \(\alpha\)
YawErrT\(\alpha\)	(deg)	Nacelle-yaw error for turbine \(\alpha\)
TIAmbT\(\alpha\)	(%)	Ambient turbulence intensity of the wind at the the rotor disk for turbine \(\alpha\). The ambient turbulence intensity is based on a spatial-average of the three vector components, instead of just the axial component.
RtVAmbT\(\alpha\)	(m/s)	Rotor-disk-averaged ambient wind speed (normal to disk, not including structural motion, local induction or wakes from upstream turbines) for turbine \(\alpha\)
RtVAmbFiltT\(\alpha\)	(m/s)	Time-filtered value of RtVAmbT:math:alpha for turbine \(\alpha\)
AxiSkewT\(\alpha\)	(deg)	Skew azimuth angle (used in curled-wake model) for turbine \(\alpha\)
AxiSkewFiltT\(\alpha\)	(deg)	Time-filtered value of AxiSkewT:math:alpha for turbine \(\alpha\)
RtSkewT\(\alpha\)	(deg)	Skew angle (used in curled-wake model) for turbine \(\alpha\)
RtSkewFiltT\(\alpha\)	(deg)	Time-filtered value of RtSkewT:math:alpha for turbine \(\alpha\)
RtGamCurlT\(\alpha\)	(m^2/s)	Rotor circulation (used in curled-wake model) for turbine \(\alpha\)
RtVRelT\(\alpha\)	(m/s)	Rotor-disk-averaged relative wind speed (normal to disk, including structural motion and wakes from upstream turbines, but not including local induction) for turbine \(\alpha\)
RtCtAvgT\(\alpha\)	(-)	Rotor-disk-averaged thrust coefficient for turbine \(\alpha\)
CtT\(\alpha\)N\(\beta\)	(-)	Azimuthally averaged thrust force coefficient (normal to disk) for radial output node \(\beta\) of turbine \(\alpha\)
Wake (for an Individual Rotor)
WkAxs\(\delta\)T\(\alpha\)D\(\gamma\)	(-)	Orientation of the wake centerline for downstream distance \(\gamma\) of turbine \(\alpha\) in the global coordinate system
WkPos\(\delta\)T\(\alpha\)D\(\gamma\)	(m)	Center position of the wake centerline for downstream distance \(\gamma\) of turbine \(\alpha\) in the global coordinate system
WkVel\(\delta\)T\(\alpha\)D\(\gamma\)	(m/s)	Advection, deflection, and meandering velocity (not including the horizontal wake-deflection correction or low-pass time-filtering) of the wake for downstream distance \(\gamma\) of turbine \(\alpha\) in the global coordinate system
WkDiamT\(\alpha\)D\(\gamma\)	(m)	Wake diameter for downstream distance \(\gamma\) of turbine \(\alpha\)
WkDfVxT\(\alpha\)N\(\beta\)D\(\gamma\)	(m/s)	Axial wake velocity deficits for radial output node \(\beta\) and downstream distance \(\gamma\) of turbine \(\alpha\)
WkDfVrT\(\alpha\)N\(\beta\)D\(\gamma\)	(m/s)	Radial wake velocity deficits for radial output node \(\beta\) and downstream distance \(\gamma\) of turbine \(\alpha\)
EddVisT\(\alpha\)N\(\beta\)D\(\gamma\)	(m\(^2\)/s)	Total eddy viscosity for radial output node \(\beta\) and downstream distance \(\gamma\) of turbine \(\alpha\)
EddAmbT\(\alpha\)N\(\beta\)D\(\gamma\)	(m\(^2\)/s)	Individual contribution to the eddy viscosity from ambient turbulence for radial output node \(\beta\) and downstream distance \(\gamma\) of turbine \(\alpha\)
EddShrT\(\alpha\)N\(\beta\)D\(\gamma\)	(m\(^2\)/s)	Individual contributions to the eddy viscosity from the shear layer for radial output node \(\beta\) and downstream distance \(\gamma\) of turbine \(\alpha\)
Ambient Wind and Array Effects
W\(\eta\)VAmb\(\delta\)	(m/s)	Ambient wind velocity (not including wakes) for point \(\eta\) in the global coordinate system (from the low-resolution domain)
W\(\eta\)VDis\(\delta\)	(m/s)	Disturbed wind velocity (including wakes) for point \(\eta\) in the global coordinate system (from the low-resolution domain)