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How to parametrize urban-canopy drag to reproduce wind-direction effects within the canopy

Santiago, J. L., Coceal, O. and Martilli, A. (2013) How to parametrize urban-canopy drag to reproduce wind-direction effects within the canopy. Boundary-Layer Meteorology, 149 (1). pp. 43-63. ISSN 0006-8314

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To link to this item DOI: 10.1007/s10546-013-9833-y

Abstract/Summary

The mean wind direction within an urban canopy changes with height when the incoming flow is not orthogonal to obstacle faces. This wind-turning effect is induced by complex processes and its modelling in urban-canopy (UC) parametrizations is difficult. Here we focus on the analysis of the spatially-averaged flow properties over an aligned array of cubes and their variation with incoming wind direction. For this purpose, Reynolds-averaged Navier–Stokes simulations previously compared, for a reduced number of incident wind directions, against direct numerical simulation results are used. The drag formulation of a UCparametrization ismodified and different drag coefficients are tested in order to reproduce the wind-turning effect within the canopy for oblique wind directions. The simulations carried out for a UC parametrization in one-dimensional mode indicate that a height-dependent drag coefficient is needed to capture this effect.

Item Type:Article
Refereed:Yes
Divisions:Faculty of Science > School of Mathematical, Physical and Computational Sciences > Department of Meteorology
ID Code:34596
Publisher:Springer

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