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*WINDFILE,file=filename

Data format:

One line with 9 parameters, as follows:

IWINDFILETYPE REFERENCEHEIGHT WIDTH X Y Z ALP NSLICE TIMEM

Status :

Optional

Restriction :

Only one file can be used per analysis

Purpose :

To define a turbulent wind file (compatible with Turbsim software)

Details :

Parameter Description
FILENAME Gives the path to the wind file.
IWINDFILETYPE = 1 : HH_Wind Hub-Height wind file
= 2 : FF_Wind Binary full-field wind file (.bts or .wnd plus .sum format)
REFERENCEHEIGHT This is the reference height for the wind Note: reference height for HH and/or 4D winds (was hub height), in meter (A priori note useful for FF_Wind). (m)
WIDTH This the width of the wind field (m)
X Position in X of the origin of the windfile (m)
Y Position in Y of the origin of the windfile (m)
Z Position in Z of the origin of the windfile (m)
ALP Orientation of the wind file ()
NSLICE Option to read the windfile based on timestep : For a given time, files between Tbeg to Tend are loaded. Files before Tbeg-Nslice*dt are released. Nslice=100 is a good starting value
TIMEM To create a mirror effect: in the FF files, the slices up to TimeM are loaded and mirror effet is used above TimeM in the DeepLines simulation.


Data File Format for Hub Height Winds :

!Sample hub-height wind file for AeroDyn

! Time  Wind   Wind   Vert.  Horiz.  Vert.  LinV   Gust 
!       Speed  Dir    Speed  Shear   Shear  Shear  Speed
0      15.000  5.000   -1    0.020   0.14   0      0 
0.1   16.545  4.755   -0.9   0.022   0.14   0      0 
0.2   17.939  4.045   -0.8   0.024   0.14   0      0 
0.3   19.045  2.939   -0.7   0.027   0.14   0      0 
0.4   19.755  1.545   -0.6   0.030   0.14   0      0 
0.5   20.000  0.000   -0.5   0.033   0.14   0      0 
0.6   19.755  -1.545  -0.4   0.036   0.14   0      0 
0.7   19.045  -2.939  -0.3   0.040   0.14   0      0 
0.8   17.939  -4.045  -0.2   0.045   0.14   0      0 
0.9   16.545  -4.755  -0.1   0.049   0.14   0      0 
1     15.000  -5.000   0     0.054   0.14   0      0 
1.1   13.455  -4.755   0.1   0.060    0.14  0      0 
...
Colum Parameter Units Description
1 TDAT sec Time at which the conditions on the current line are specified to occur. The first value should be zero, with subsequent values increasing monotonically. Intervals between time values need not be constant. Wind conditions between specified TDAT values are linearly interpolated. If the simulation time duration exceeds the last value of TDAT, the final value of each parameter is held constant for the remainder of the simulation.
2 V m/s ft/s This hub-height wind speed represents the total horizontal wind component. Units must be consistent with the selection made in aerodyn.ipt on line 2.
3 DELTA deg The wind direction of the horizontal component specified above, with zero aligned with the zero yaw angle.
4 VZ m/s ft/s The vertical wind speed component is specified with the convention positive up. This value is assumed uniform over the rotor disc (i.e. it is unaffected by any specified shear values).
5 HSHR -- The horizontal wind shear parameter represents the linear variation of wind speed across the rotor disc. Typical values are 1. < HSHR < +1, and represent the wind speed at the blade tip on one side of the rotor, minus the wind speed at the blade tip on the opposite side of the rotor, divided by the hub-height wind speed (V). The shear is measured in the direction perpendicular to the hubheight wind vector specified by DELTA above.
6 VSHR -- The vertical power law shear is the exponent of a power-law shear profile. It is used to determine the wind speed, Vz, at any height, z, based on the hub- height, zhub (see line 9 of aerodyn.ipt), and hubheight wind speed, Vhub, using the equation: Vz = Vhub (z/zhub)VSHR A typical value is 0.14 representing a 1/7th power-law profile. Normally you should use either VSHR or VLinSHR (see next), not both (set the parameter you do not wish to use to zero).
7 VLinSHR -- The linear vertical shear parameter works in the same way as HSHR but in the vertical plane across the rotor disc. It represents the wind speed at the blade tip at the top of the rotor, minus the wind speed at the blade tip at the bottom of the rotor, divided by the hub-height wind speed (V). Normally you should use either VLinSHR or VSHR (above), not both (set the parameter you do not wish to use to zero).
8 VG m/s ft/s The gust velocity is a parameter used to add a constant horizontal wind speed component across the entire rotor disc. This parameter is not influenced by any shear values. This parameter is seldom used and can be set to zero for most cases. Changes in wind speed are normally specified using the hub-height wind speed parameter, V.