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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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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description 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).
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source Cambridge University Press:JISC Collections:Full Collection Digital Archives (STM and HSS) (218 titles)
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
title A turbulent-transport model for concentration fluctuations and fluxes
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