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Numerical Simulation of Dispersion around an Isolated Cubic Building: Model Evaluation of RANS and LES. Building and Environment.

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Numerical Simulation of Dispersion around an Isolated Cubic Building: Model Evaluation of RANS and LES. Building and Environment.

Tominaga, Y. and Stathopoulos, T. (2010) Numerical Simulation of Dispersion around an Isolated Cubic Building: Model Evaluation of RANS and LES. Building and Environment. Building and Environment, 45 (10). pp. 2231-2239.

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Official URL: http://dx.doi.org/10.1016/j.buildenv.2010.04.004

Abstract

Several studies have been carried out on CFD prediction based on a RANS (Reynolds Averaged Navier–Stokes equations) model for dispersion around buildings, but it was reported that a RANS computation often provides extremely high concentration, which are not observed in usual measurements. These results suggest that transient simulations such as the large-eddy simulation (LES) might be required to achieve more accurate results. Nevertheless, very few studies have evaluated the basic performance of LES in modeling the dispersion field for a simple configuration in comparison with the RANS model. Therefore, relative performance of these simulation methods for dispersion problem around buildings should be clarified in order to make it possible to choose a suitable numerical method for its purpose. The purpose of this study is to confirm the accuracy of LES in modeling plume dispersion near and around a simple building model and to clarify the mechanism for the discrepancy in relation to the RANS computation. Simple LES modeling gives better results than RNG modeling of the distribution of concentration, although the difference for mean velocity is not so large. The horizontal diffusion of concentration is well reproduced by LES. This tendency is closely related to the reproduction of unsteady periodic fluctuation around cubical forms in LES.

Divisions:Concordia University > Gina Cody School of Engineering and Computer Science > Building, Civil and Environmental Engineering
Item Type:Article
Refereed:Yes
Authors:Tominaga, Y. and Stathopoulos, T.
Journal or Publication:Building and Environment
Date:2010
Digital Object Identifier (DOI):10.1016/j.buildenv.2010.04.004
ID Code:981686
Deposited By: THEODORE STATHOPOULOS
Deposited On:22 Nov 2016 16:32
Last Modified:18 Jan 2018 17:53
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