A turbulent-transport model for concentration fluctuations and fluxes

A second-order closure model describing the diffusion of a passive scalar from a small source is presented. The model improves upon the earlier work of Lewellen & Teske (1976) by ensuring the early stage of the release, the so-called meander phase, is accurately described. In addition to the mea...

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Bibliographic Details
Published in:Journal of fluid mechanics 1984-02, Vol.139, p.193-218
Main Authors: Sykes, R. I., Lewellen, W. S., Parker, S. F.
Format: Article
Language:English
Subjects:
Exact sciences and technology
Fluid dynamics
fluid mechanics
fluxes
Fundamental areas of phenomenology (including applications)
modeling
numerical analysis
Physics
turbulence
Turbulent flows, convection, and heat transfer
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Summary:A second-order closure model describing the diffusion of a passive scalar from a small source is presented. The model improves upon the earlier work of Lewellen & Teske (1976) by ensuring the early stage of the release, the so-called meander phase, is accurately described. In addition to the mean concentration and scalar fluxes, a model equation for the evolution of the scalar variance is proposed. The latter introduces a new lengthscale which represents the scale of the concentration fluctuations. The model predictions are compared with the recent experimental data of Fackrell & Robins (1982a, b).
ISSN:0022-1120
1469-7645
DOI:10.1017/S002211208400032X