Naslov
Atmospheric boundary layer modeling in the climatic wind tunnel

Autori
Ribičić, Matko

Vrsta, podvrsta i kategorija rada
Ocjenski radovi, diplomski rad, diplomski

Fakultet
Fakultet strojarstva i brodogradnje

Mjesto
Zagreb

Datum
04.12

Godina
2015

Stranica
52

Mentor
Kozmar, Hrvoje ; Pospišil, Stanislav

Ključne riječi
Experimental environmental aerodynamics ; Atmospheric boundary layer ; Turbulence ; Wind-tunnel experiments ; Counihan method ; Velocity, pressure and temperature measurements

Sažetak
Experiments are carried out in the climatic wind tunnel to investigate the influence of castellated barrier wall, vortex generators and surface roughness on flow characteristics and the simulated atmospheric boundary layer, as precise modeling of atmospheric flow and turbulence in the wind tunnel is a key prerequisite when studying wind effects on structures and vehicles. Extensive measurements were carried out to determine flow velocity, pressure and temperature using hot wire, Prandtl-Pitot tube, pressure sensors and thermometers. Experimental results were reported as profiles of mean flow velocity, turbulence intensity and turbulent length scales, as well as power spectral density of velocity fluctuations. A particular focus was on flow development and uniformity at various positions in the wind-tunnel test section, as well as characteristics of the atmospheric boundary layer simulations at the turntable. The barrier was observed to cause a decrease in flow velocity and an increase in the turbulence close to the surface, vortex generators enhance turbulence throughout the entire height range under scope, while an increased turbulence and a decreased flow due to surface roughness is exhibited close to surface. The atmospheric boundary layer is successfully simulated for suburban/urban type of terrain. The simulation length scale is 1:300. Experimental results are in good agreement with previous studies, international standards and codes. The simulated atmospheric boundary layer is developed and uniform at the turntable.

Izvorni jezik
Engleski

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