3D Turbulent Wind Generation

This submission allow the user for generation of three-dimensional turbulent wind fields, by employing a Kaimal spectrum and IEC-based coherence function. Furthermore, it is possible to export the generated wind fields as FAST-compatible .bts, in order to simulate wind turbine dynamic behavior in presence of stochastic wind.
Required inputs are:

- Average wind speed at hub height, U0 [m/s];
- Desired turbulence intensity, I0 [%];
- Hub height, HubHt [m];
- Random seed;
- Number of grid points on z-axis, Nz (odd number);
- Number of grid points on y-axis, Ny (odd number);
- Grid width, Ly [m];
- Grid height, Lz [m];
- Time step, dt [s];
- Simulation length, T [s] (generally 600s);
- Length scales, (xLu,xLv,xLw) [m];
- Vertical wind shear exponent;
- Coherence decay, a;
- Coherence length scale, Lc [m].

The file GenerateOneBTS.m better highlights how the different functions operate.