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CFD Modeling of Pollutant Dispersion in Building Array: Evaluation of Turbulent Scalar Flux Modeling in RANS Model Using LES Results

Title:

CFD Modeling of Pollutant Dispersion in Building Array: Evaluation of Turbulent Scalar Flux Modeling in RANS Model Using LES Results

Tominaga, Y. and Stathopoulos, T. (2012) CFD Modeling of Pollutant Dispersion in Building Array: Evaluation of Turbulent Scalar Flux Modeling in RANS Model Using LES Results. Journal of Wind Engineering and Industrial Aerodynamics, 104 (106). pp. 484-491.

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Official URL: http://dx.doi.org/10.1016/j.jweia.2012.02.004

Abstract

Modeling of turbulent scalar flux in CFD (Computational Fluid Dynamics) for near-field dispersion around buildings is examined by investigating both velocity and concentration fields obtained by two modeling approaches, i.e., RANS RNG k-ε and LES. A building array model with a point source located in between the central buildings is adopted as a target configuration. First, the prediction accuracy of LES is confirmed by comparing with the RNGcomputation and the results from an experiment conducted by the authors. LES gives better results than RNG, in terms of time-averaged velocity and concentration distribution in comparison with the wind tunnel experimental results. Next, the eddy viscosity and the eddy diffusivity are determined by LES data using a least square approach as suggested in the dynamic sub-grid scale model. Large differences can be observed between the distributions of the estimated eddy viscosity by using LES data and the eddy diffusivity obtained by RNG, since the eddy diffusivity is not always proportional to the eddy viscosity.

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:Journal of Wind Engineering and Industrial Aerodynamics
Date:2012
Digital Object Identifier (DOI):10.1016/j.jweia.2012.02.004
ID Code:981675
Deposited By: THEODORE STATHOPOULOS
Deposited On:22 Nov 2016 16:28
Last Modified:18 Jan 2018 17:53
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