Modelling concentration fluctuation moments for spherically symmetric mean concentration

Mole, N. and Clarke, E.D. and Rietzler, E. (1997) Modelling concentration fluctuation moments for spherically symmetric mean concentration. Il nuovo cimento C, 20 C (3). pp. 399-412. ISSN 1826-9885

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Clarke and Mole (Environmetrics, 6 (1995) 607-617) presented a model for concentration fluctuation moments of a passive scalar dispersing in a turbulent flow. This followed Sullivan and Moseley’s work in making use of the equation for the evolution of the concentration moments integrated over all space, together with Chatwin and Sullivan’s (J. Fluid Mech., 212 (1990) 533-556) description relating higher moments to the mean concentration. The model incorporated a simple closure to express the concentration gradient in terms of the concentration. Numerical results were presented for 1, 2 and 3 spatial dimensions under the assumption that the spatial distribution of the mean concentration was spherically symmetric and Gaussian. Two simple functional forms were used for the spreading rate of the mean cloud. Here those results are briefly summarised. Some asymptotic large time results are also given for spherically symmetric mean concentration of general functional form, and numerical results are obtained for a number of different functional forms.

Item Type: Article
Additional Information: Paper presented at EUROMECH Colloquium 338 “Atmospheric Turbulence and Dispersion in Complex Terrain” and ERCOFTAC Workshop “Data on Turbulence and Dispersion in Complex Atmospheric Flows”, Bologna, 4-7 September 1995.
Uncontrolled Keywords: Convection, turbulence and diffusion; turbulent flows, convection, and heat transfer; conference proceedings
Subjects: 500 Scienze naturali e Matematica > 530 Fisica
Depositing User: Marina Spanti
Date Deposited: 06 Feb 2018 10:07
Last Modified: 06 Feb 2018 10:07

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