A finite mixing length theory for turbulent diffusion

Nielsen, Peter and Teakle, Ian A. L. (2003). A finite mixing length theory for turbulent diffusion. In: Sanchez-Arcilla, Agustin and Bateman, Allen, Proceedings RCEM 2003. 3rd IAHR Symposium on River, Coastal and Estuarine Morphodynamics, Barcelona, Spain, (17-31). 1-5 september 2003.

Author Nielsen, Peter
Teakle, Ian A. L.
Title of paper A finite mixing length theory for turbulent diffusion
Conference Paper Type Fully Published Paper
Conference name 3rd IAHR Symposium on River, Coastal and Estuarine Morphodynamics
Conference location Barcelona, Spain
Conference dates 1-5 september 2003
Proceedings title Proceedings RCEM 2003
Editor Sanchez-Arcilla, Agustin
Bateman, Allen
Publication date 2003
ISBN 9080564966
Start page 17
End page 31
Total pages 15
Language eng
Abstract/Summary A finite-mixing-length theory is presented for turbulent mixing. This theory contains Fickian diffusion as the limiting case for lm/L-->0, where lm is the mixing length and L is the scale of the distribution under consideration. The new model is of similar generality to that of Taylor (1921), "Diffusion by continuous movements." However, while Taylor's model, being strictly Lagrangian, is difficult to apply to inhomogeneous scenarios, the new model is Eulerian and easily applicable to bottom boundary layers and other inhomogeneous flows. When applied to steady suspended sediment concentrations c(z), the theory predicts the observed trend of apparent Fickian diffusivities epsilonFick = –wsc/(dc/dz) being larger for particles with larger settling velocity ws, in a given flow.
Subjects 0905 Civil Engineering
Q-Index Code E1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Conference Paper
Sub-type: Fully Published Paper
Collections: Excellence in Research Australia (ERA) - Collection
School of Civil Engineering Publications
 
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Created: Tue, 03 Feb 2009, 12:33:42 EST by Paul Rollo on behalf of School of Civil Engineering