Abstract

Prediction accuracy of pollutant dispersion within an urban street canyon of width to height ratio W/. H=1 is examined using two steady-state Reynolds-averaged Navier-Stokes (RANS) turbulence closure models, the standard k-ε and Reynolds Stress Model (RSM), and Large Eddy Simulation (LES) coupled with the advection-diffusion method for species transport. The numerical results, which include the statistical properties of pollutant dispersion, e.g. mean concentration distributions, time-evolution and three-dimensional spreads of the pollutant, are then compared to wind-tunnel (WT) measurements. The accuracy and computational cost of both numerical approaches are evaluated. The time-evolution of the pollutant concentration (for LES only) and the mean (time-averaged) values are presented. It is observed that amongst the two RANS models, RSM performed better than standard k-ε except at the centerline of the canyon walls. However, LES, although computationally more expensive, did better than RANS in predicting the concentration distribution because it was able to capture the unsteady and intermittent fluctuations of the flow field, and hence resolve the transient mixing process within the street canyon.

Autore Pugliese

• Buccolieri Riccardo

Tutti gli autori

• Salim S. M. , Buccolieri R. , Chan A. , Di Sabatino S.

Titolo volume/Rivista

JOURNAL OF WIND ENGINEERING AND INDUSTRIAL AERODYNAMICS

Anno di pubblicazione

2011

ISSN

0167-6105

ISBN

Non Disponibile

Numero di citazioni Wos

62

Ultimo Aggiornamento Citazioni

27/04/2018

Numero di citazioni Scopus

88

Ultimo Aggiornamento Citazioni

28/04/2018

Settori ERC

Non Disponibile

Codici ASJC

Non Disponibile