Large Eddy Simulation of traffic pollutant dispersion in a residence area

Zhang, Zhaoshun; Cui, Guixiang; Shi, Rui-Feng; Wang, Zhishi; Xu, Chunxiao

doi:10.1615/ichmt.2009.turbulheatmasstransf.2010

Cited by 1 publication

(1 citation statement)

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“…In several studies, CFD has been applied to pollutant dispersion around actual building groups in urban areas based on RANS (Moon et al, 1997;Hanna et al, 2006;Tseng et al, 2006;Patnaik et al, 2007;Neofytou et al, 2008;Baik et al, 2009;Zhang et al, 2009;Pontiggia et al, 2010Pontiggia et al, , 2011 and LES (Xie and Castro, 2009;Xie, 2011;Liu et al, 2011). Although reasonable qualitative outcomes have been obtained from these studies, the results must be evaluated quantitatively.…”

Section: Dispersion Around Building Complexesmentioning

confidence: 99%

CFD simulation of near-field pollutant dispersion in the urban environment: A review of current modeling techniques

Tominaga

Stathopoulos

2013

Atmospheric Environment

404

158

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h i g h l i g h t s CFD simulations of near-field dispersion in the urban environment are reviewed. Key features of near-field pollutant dispersion are identified and discussed. To understand inherent strengths and limitations of numerical models is important. Careful model evaluation while paying attention to their uncertainty is necessary. a b s t r a c tNear-field pollutant dispersion in the urban environment involves the interaction of a plume and the flow field perturbed by building obstacles. In the past two decades, micro-scale Computational Fluid Dynamics (CFD) simulation of pollutant dispersion around buildings and in urban areas has been widely used, sometimes in lieu of wind tunnel testing. This paper reviews current modeling techniques in CFD simulation of near-field pollutant dispersion in urban environments and discusses the findings to give insight into future applications. Key features of near-field pollutant dispersion around buildings from previous studies, i.e., three-dimensionality of mean flow, unsteadiness of large-scale flow structure, and anisotropy of turbulent scalar fluxes, are identified and discussed. This review highlights that it is important to choose appropriate numerical models and boundary conditions by understanding their inherent strengths and limitations. Furthermore, the importance of model evaluation was emphasized. Because pollutant concentrations around buildings can vary by orders of magnitudes in time and space, the model evaluation should be performed carefully, while paying attention to their uncertainty. Although CFD has significant potential, it is important to understand the underlying theory and limitations of a model in order to appropriately investigate the dispersion phenomena in question.

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