Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/22446
Title: CFD simulation of flow and dispersion around an isolated building : effect of inhomogeneous ABL and near-wall treatment
Authors: Ai, ZT
Mak, CM 
Keywords: Building
CFD
Dispersion
Flow
Inhomogeneous ABL
Near-wall treatment
Issue Date: 2013
Publisher: Pergamon Press
Source: Atmospheric environment, 2013, v. 77, p. 568-578 How to cite?
Journal: Atmospheric environment 
Abstract: This paper presents a study of the effect of the inhomogeneous atmospheric boundary layer (ABL) and near-wall treatment on a computational fluid dynamics (CFD) simulation of the flow and dispersion around an isolated building. Based on a revised k-. e{open} model (MMK), the effect of the inhomogeneous ABL is studied by comparing several sets of inhomogeneous inlet conditions with a homogeneous one, while the roughness-adapted standard wall functions and two-layer model are compared to examine the effect of the near-wall treatment of rough ground. Wind tunnel experimental data from previous investigations are used to validate the numerical simulations. The inhomogeneous ABL has a significant effect on the prediction of the flow and dispersion fields, depending on the percentage deviation of the incident from the inlet conditions. A decreased incident k profile results in a longer reattachment length on the roof and a larger recirculation region in the wake, which in turn produce decreased and increased nondimensional velocity and concentration fields, respectively. An increased incident U profile enlarges the reattachment lengths and raises the k field, which has a similar effect on the nondimensional velocity and concentration fields as decreased k. It is observed that the use of the two-layer model to solve the near-wall viscous sublayer clearly improves the prediction of flow and dispersion, depending on the role of the low-Reynolds-number effect of the near-wall region on the entire wall-bounded turbulent flow.
URI: http://hdl.handle.net/10397/22446
ISSN: 1352-2310
EISSN: 1873-2844
DOI: 10.1016/j.atmosenv.2013.05.034
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