The final approach and touchdown of a landing aircraft is studied numerically with a hybrid RANS/LES approach, as well as a pulsed coherent LIDAR system. Particular emphasis is put on the ground effect, the engine-gear vortex and the wake vortex evolution before and after touchdown. We compare CFD results with LIDAR measurement data collected in a recent campaign at Vienna airport. The radial velocity method was applied to retrieve vortex position and circulation. The vortex structures predicted by the simulations are clearly visible in those measurements. Simulated tangential velocity profiles are compared with vortex model profiles. It is observed that the standard vortex model can be improved including mirror vortices.
The results of spatiotemporal visualization of the kinetic energy of turbulence, its dissipation rate, and integral scale of turbulence from measurements by a Windcube 200s lidar with the use of the conical scanning by the probing beam in the atmospheric boundary layer are presented. When evaluating the parameters of wind turbulence, the lidar data filtering procedure was applied. This procedure allows obtaining acceptable results with a non-zero probability of bad estimate of the radial velocity.
The method of maximum of the function of accumulated spectra (MFAS) was used for the first time to estimate the wind velocity vector from measurements by a micropulsed coherent Doppler lidar (MPCDL) with conical scanning by the probing beam. In the experiment with a Windcube 200s MPCDL, it is found that the use of MFAS allows an increase in the maximum height of retrieval of the vertical profiles of the wind speed and direction by an average of 30% in comparison with the filtered sine-wave fitting.
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