Scopus
Numerical study of dispersing pollutant clouds in a built-up environment
International Journal of Heat and Fluid Flow · Şubat 2009
Makale Bilgileri
DergiInternational Journal of Heat and Fluid Flow
Yayın TarihiŞubat 2009
Cilt / Sayfa30 · 3-19
Scopus ID2-s2.0-58149513101
Özet
In this paper, we study numerically the dispersion of a passive scalar released from an instantaneous point source in a built-up (urban) environment using a Reynolds-averaged Navier-Stokes method. A nonlinear k-ε{lunate} turbulence model [Speziale, C.G., 1987. On nonlinear k-l and k-ε{lunate} models of turbulence. J. Fluid Mech., 178, 459-475] was used for the closure of the mean momentum equations. A tensor diffusivity model [Yoshizawa, A., 1985. Statistical analysis of the anisotropy of scalar diffusion in turbulent shear flows. Phys. Fluids, 28, 3226-3231] was used for closure of the scalar transport equations. The concentration variance was also calculated from its transport equation, for which new values of Yoshizawa's closure coefficients are used, in order to account for the instantaneous tracer release and the complex geometry. A new dissipation length-scale model, required for the modelling of the dissipation rate of concentration variance, is also proposed. The numerical results for the flow, the pollutant concentration and the concentration variance, are compared with experimental data. This data was obtained from a water-channel simulation of a full-scale field experiment of tracer dispersion through a large array of building-like obstacles known as the Mock Urban Setting Trial (MUST). © 2008 Elsevier Inc. All rights reserved.
Yazarlar (3)
1
Bing Chen Wang
2
Eugene Yee
3
Fue Sang Lien
Anahtar Kelimeler
Bluff body
Concentration variance model
Dispersion
RANS
Rough-wall boundary-layer
Urban canopy
Kurumlar
Defence Research and Development Canada
Ottawa Canada
University of Manitoba
Winnipeg Canada
University of Waterloo
Waterloo Canada
Metrikler
29
Atıf
3
Yazar
6
Anahtar Kelime