Flow in a Street Canyon for any External Wind Direction |
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| Authors: | Lionel Soulhac Richard J Perkins Pietro Salizzoni |
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| Institution: | (1) Laboratoire de Mécanique des Fluides et d’Acoustique, UMR CNRS 5509, University of Lyon – Ecole Centrale de Lyon, INSA Lyon, Université Claude Bernard Lyon I, 36, Avenue Guy de Collongue, 69134 Ecully, France;(2) DIASP Politecnico di Torino, Corso Einaudi, 24, Torino, Italy |
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| Abstract: | An analytical model has been developed for the flow along a street canyon (of height H and width W), generated by an external wind blowing at any angle relative to the axis of the street. Initially, we consider the special
case of a wind blowing parallel to the street. The interior of the street is decomposed into three regions, and the flow within
each region is assumed to depend only on the external wind and the distance to the closest solid boundary. This decomposition
leads to two different flow regimes: one for narrow streets (H/W > 1/2) and one for wide streets (H/W < 1/2). The theoretical model agrees well with results obtained from numerical simulations using a Reynolds-Averaged Navier–Stokes
model. We then generalize the model to the case of arbitrary wind direction. Numerical solutions show that the streamlines
of the mean flow in the street have a spiral form, and for most angles of incidence, the mass flux along the street scales
on the component of the external wind resolved parallel to the street. We use this result to generalize the model derived
for wind blowing parallel to the street, and the results from this model agree well with the numerical simulations. The model
that has been developed can be evaluated rapidly using only very modest computing power, so it is suitable for use as an operational
tool. |
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| Keywords: | Numerical modelling Street canyon Urban canopy flow |
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