Wake Characterization of Building Clusters Immersed in Atmospheric Boundary Layers Article Swipe
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· 2023
· Open Access
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· DOI: https://doi.org/10.21203/rs.3.rs-2777274/v1
· OA: W4362734962
Wind tunnel experiments were conducted to understand the effect of building array size ( N ), aspect ratio ( AR ), and the spacing between building ( W S ) on the mean structure and decay of their wakes. Arrays of size 3×3, 4×4,and 5×5, AR = 4, 6, and 8, and W S = 0.5 W B , 1 W B , 2 W B and 4 W B (where W B is the building width) were considered. Three different wake regimes behind the clusters were identified: near-, transition-, and far-wake regimes. The results suggest that the spatial extent of these wake regimes is governed by the overall array width ( W A ). The effects of individual buildings are observed to be dominant in the near-wake regime (0 < x/ W A < 0.5) where individual wakes appear behind each building. These wakes are observed to merge together in the ‘transition wake region’ (0.5 < x/W A < 1.5), forming a combined wake in which the individual contributions are no longer apparent. In the far-wake regime ( x/W A > 1.5), the wake characteristics and scales of building clusters wakes are similar to those downstream of a single isolated building. Accordingly, new local and global scaling parameters in the near- and far-wake regimes are introduced. The decay of the centreline velocity deficit is then modelled as a function of the three parameters considered in the experiment.
