Fluctuating Three Component

For the IECWind fluctuating 3-component wind (Mann turbulence), only the fluctuating part of the wind is given in the wind input files. The mean wind speed given as input and is added to the yield the total wind velocity in the longitudinal direction. The input files must conform to the 3-dimensional 3-component wind time series from the rectangular IEC format (See Thomsen, K., 2006. Mann turbulence for the IEC Code Comparison Collaborative (OC3). Risø National Laboratory, and also HAWC2 v13.1, 2024. Release Notes: Mann Turbulence box - read in wrong direction. DTU Wind Energy). More specifically they must include time series of wind velocity in binary format, with a 3-dimensional array having indices in vertical direction running fastest, then indices in lateral direction and indices in longitudinal direction running slowest.

Required input for wind components is:

Direction

Mean wind direction

Mean Speed

Mean wind speed

Vertical Coordinate

N input z-coordinates for scaling of mean wind speed and fluctuating wind

Mean Speed Factor

N scaling factors for mean wind speed, to define shear profile

Longitudinal Velocity Factor

N scaling factors for height-dependent scaling of longitudinal component of fluctuating wind

Lateral Velocity Factor

N scaling factors for height-dependent scaling of lateral component of fluctuating wind

Vertical Velocity Factor

N scaling factors for height-dependent scaling of vertical component of fluctuating wind

Longitudinal File Name

File containing longitudinal component of fluctuating wind

Lateral File Name

File containing lateral component of fluctuating wind

Vertical File Name

File containing vertical component of fluctuating wind

Required input for orienting the wind domain in the global reference frame is:

Lower left position

(X, Y, Z) coordinates (in a wind aligned system) of the data point at the front lower left (looking upstream) of the domain

Wind field domain size

Number of data points in the longitudinal (NX), lateral (NY), and vertical (NZ) directions

Wind field size

The field lengths in the longitudinal (LX), lateral (LY), and vertical (LZ) directions, defined such that the spacing between data points is given by D[X,Y,Z] = L[X,Y,Z] / N[X,Y,Z].

Required inputs to specify how turbulence files are read from file, and advected through the domain:

Number of slices

Number of wind cross-sectional planes (slices) to load from file into memory

Reverse box

Specify if turbulence is advected from end of file to start of file (default) or in reverse order (legacy).