Title: Prediction of second-order concentration statistics for dispersing plumes in obstacle arrays

Authors: Bing-Chen Wang, Eugene Yee, Fue-Sang Lien

Addresses: Department of Mechanical and Manufacturing Engineering, University of Manitoba, Winnipeg, MB R3T 5V6, Canada. ' Defence R&D Canada – Suffield, P.O. Box 4000, STN Main, Medicine Hat, AB, T1A 8K6, Canada. ' Department of Mechanical and Mechatronics Engineering, University of Waterloo, Waterloo, Ontario, N2L 3G1, Canada

Abstract: In this paper, the turbulent dispersion of a passive scalar released from a continuous ground-level point-source in two obstacle arrays is simulated using the Reynolds-averaged Navier-Stokes (RANS) method. An explicit algebraic nonlinear turbulent stress model and a tensor-diffusivity scalar-flux model are used for the closure of the ensemble-averaged momentum and scalar transport equations, respectively. The principal physical mechanisms governing the transport of the second-order concentration statistics of a passive scalar are modelled following Yee et al. (2009). The results of the simulation for the flow and concentration statistics are compared against two sets of high-quality water-channel measurement data obtained using laser induced fluorescence (for concentration) and laser Doppler anemometry (for velocity).

Keywords: bluff body; concentration variance; plume dispersion; pollutant dispersion; RANS; rough-wall boundary layers; urban environments; obstacle arrays; turbulent dispersion; turbulent stress model; tensor-diffusivity scalar-flux model; ensemble-averaged momentum; scalar transport equations; modelling; environmental pollution; water channel simulation.

DOI: 10.1504/PCFD.2010.034456

Progress in Computational Fluid Dynamics, An International Journal, 2010 Vol.10 No.4, pp.252 - 262

Published online: 04 Aug 2010 *

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