Abstract
The geometry of urban canyons is an important determinant of near-surface air flow patterns in cities. Characteristics canyon geometries, expressed in terms of height-to-width (H/W) and length-to-height (L/H) ratios, are known to produce three principal air flow regimes: ‘isolated roughness’, ‘wake interference’ and ‘skimming flow’. However, there remain uncertainties about the relationship between canyon geometry and transition from one flow regime to another. This paper illustrates the potential for mathematical modelling to resolve some of the current uncertainties. We use a numerical model which solves the Reynolds momentum equations to simulate the major canyon air flow regimes and to illustrate the relationship between canyon geometry and transition from one flow regime to another.
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