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Modelling concentration fluctuations in a cloud dispersing in an obstacle array

DOI: 10.1615/ICHMT.2009.TurbulHeatMassTransf.1540
page 12

Bing-Chen Wang
Department of Mechanical & Manufacturing Engineering, University of Manitoba, Winnipeg, MB, R3T 5V6, Canada

Eugene Yee
Defence Research & Development Canada − Suffield P.O. Box 4000, Medicine Hat, Alberta, T1A 8K6, Canada

Abstrakt

In this paper, turbulent dispersion of a passive scalar released from a ground-level instantaneous point source in a regular array of building-like obstacles is studied. The numerical results for the disturbed flow, scalar concentration and scalar concentration variance are compared with a set of high-quality experimental measurement data. This dataset corresponds to a water-channel simulation of the Mock Urban Setting Trial (MUST). A new dissipation length-scale model proposed by Yee ,i>et al. (Boundary-Layer Meteorol., 30:169−208, 2009) for modelling the scalar dissipation rate is thoroughly investigated in comparison with a conventional integral length-scale based scalar dissipation model. It is demonstrated that with our recommended modifications, the scalar dissipation model of Yee et al. can be successfully used for predicting concentration fluctuation statistics in a cloud (released from a localized source) dispersing in a built-up environment.

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