Master of Engineering Science
Mechanical and Materials Engineering
In the present work, for the first time, the spanwise organization of turbulent flow along an urban street canyon subjected to wind normal to the street axis using a boundary layer wind tunnel is systematically investigated.The effect of upstream roughness and canyon width on the turbulence in a street canyon flow is presented. Measurements in a horizontal plane were conducted at near roof-level of a street canyon using Stereoscopic Particle Image Velocimetry. Three upstream roughness arrays and two canyon width (W) to height (h) aspect ratios (AR = W / h = 1 and 3) were investigated. The results show a significant effect of upstream roughness on the mean turbulent statistics, two-point correlations and integral length-scales. A multi-scale quadrant analysis revealed that the average size of ejection and sweep events are affected by upstream roughness and canyon geometry, with the wake-interference flow regimes producing the largest. Finally, the analysis of the mean turbulent statistics, temporal correlations, instantaneous multi-scale turbulence and quadrant events yield a significant difference between the wake-interference flow regimes and the skimming flow regimes.
Jaroslawski, Tomek, "The spanwise structure of the roof-level turbulence in a street canyon flow" (2018). Electronic Thesis and Dissertation Repository. 5715.