On the wind flow patterns under neutral and unstable conditions in an urban area Online publication date: Thu, 30-Apr-2015
by Aristeidis A. Nezis; Dionysios I. Angelidis; Vasiliki D. Assimakopoulos; George C. Bergeles
International Journal of Environment and Pollution (IJEP), Vol. 47, No. 1/2/3/4, 2011
Abstract: Wind flow and pollutant dispersion within urban areas depend on the approaching flow profile and temperature stratification. Thus, the flow field developed under neutral and unstable stratification conditions, within a street-canyon, was studied experimentally and numerically for a two-dimensional urban background set-up. Wind-tunnel measurements were carried out with a triple hot sensor anemometer, while an academically developed CFD k-ε algorithm was applied, employing an unstructured Cartesian grid. The numerical code compared well with experimental results. Under unstable conditions, intensive mixing exists within the street-anyons and the buoyancy-induced flow affects the vertical air motions within and above them.
Online publication date: Thu, 30-Apr-2015
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