Measurements and computations of flow in an urban street system

Castro, I. P., Xie, Z.-T., Fuka, V., Robins, A. G., Carpentieri, M., Hayden, P., Hertwig, D. ORCID: https://orcid.org/0000-0002-2483-2675 and Coceal, O. ORCID: https://orcid.org/0000-0003-0705-6755 (2017) Measurements and computations of flow in an urban street system. Boundary-Layer Meteorology, 162 (2). pp. 207-230. ISSN 0006-8314 doi: 10.1007/s10546-016-0200-7

Abstract/Summary

We present results from laboratory and computational experiments on the turbulent flow over an array of rectangular blocks modelling a typical, asymmetric urban canopy at various orientations to the approach flow. The work forms part of a larger study on dispersion within such arrays (project DIPLOS) and concentrates on the nature of the mean flow and turbulence fields within the canopy region, recognising that unless the flow field is adequately represented in computationalmodels there is no reason to expect realistic simulations of the nature of the dispersion of pollutants emitted within the canopy. Comparisons between the experimental data and those obtained from both large-eddy simulation (LES) and direct numerical simulation (DNS) are shown and it is concluded that careful use of LES can produce generally excellent agreement with laboratory and DNS results, lending further confidence in the use of LES for such situations. Various crucial issues are discussed and advice offered to both experimentalists and those seeking to compute canopy flows with turbulence resolving models.

Item Type	Article
URI	https://reading-clone.eprints-hosting.org/id/eprint/66457
Item Type	Article
Refereed	Yes
Divisions	Science > School of Mathematical, Physical and Computational Sciences > NCAS Science > School of Mathematical, Physical and Computational Sciences > Department of Meteorology
Publisher	Springer
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