This paper investigated the impact of velocity variation in wide streets. The building
AR (Aspect Ratio) (Street-canyon-width-to-building-height i.e. W/H) has been calculated
by varying the width of street canyon. The k-? turbulence model was applied to ideal
street canyons of aspect ratio 0.5, 0.75 and 1.0 while the wind speed was varied from 0.5
to 4.0 m/s. The street canyon aspect ratio 1.0 was obtained by increasing the width of
the street two times (i.e. W=1) as much as for AR0.5 (i.e. W=0.5). However, different
results obtained from AR1 were compared with AR0.5 to analyze the impact of wide
streets. Results show that the temperatures reduce with an increase in ambient wind
speed. However, the impact of ambient wind speed was comparatively higher in narrow
street canyons since temperature reduced by over 1.4 K with an increase of 3.5 m/s in
ambient wind speed. On the other hand, in the case of AR1.0 the area weighted average
temperature reduced by 1.3 K with an increase of 3.5 m/s in ambient wind speed. It is
found that removing heat from narrower street canyons is comparatively difficult.
Results show that the temperatures within the target street canyon of AR0.5 with
ambient wind speed of 0.5 m/s were around 0.71 K higher than that in AR1