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Journal of Engineering Mathematics
Erschienen in: Journal of Engineering Mathematics 1/2016

07.09.2015

Modelling suspended sediment in environmental turbulent fluids

verfasst von: Meng Cao, A. J. Roberts

Erschienen in: Journal of Engineering Mathematics | Ausgabe 1/2016

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Abstract

Modelling sediment transport in environmental turbulent fluids is a challenge. This article develops a model of the longitudinal transport of suspended sediment in environmental fluid flows such as floods and tsunamis. The model is systematically derived from a three-dimensional turbulence model based on the Smagorinski large eddy closure. Embedding the physical dynamics into a family of problems and analysing the linear dynamics of the system, the centre manifold theory indicates the existence of a slow manifold parameterised by macroscale variables. Computer algebra then constructs the slow manifold in terms of fluid depth, depth-averaged longitudinal velocities, and suspended sediment concentration. The model includes the effects of sediment erosion, advection and dispersion and the interactions between the sediment and turbulent fluid flow. Vertical distributions of the velocity and concentration in steady flow agree with established experimental data. For a pilot study, numerical simulations of the suspended sediment under long waves show that the developed model predicts physically reasonable sediment flow interaction.
Vorheriger Artikel Transfers between libration point orbits of Sun–Earth and Earth–Moon systems by using invariant manifolds

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Fußnoten
1
This and the following boundary conditions are expressed in terms of ensemble mean quantities. Consequently, terms in the mean of the products of fluctuation might appear and a closure for them invoked [24, §2.2.6]. We assume the closure is that such products of fluctuation are negligible in the boundary conditions.
 
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Metadaten
Titel
Modelling suspended sediment in environmental turbulent fluids
verfasst von
Meng Cao
A. J. Roberts
Publikationsdatum
07.09.2015
Verlag
Springer Netherlands
Erschienen in
Journal of Engineering Mathematics / Ausgabe 1/2016
Print ISSN: 0022-0833
Elektronische ISSN: 1573-2703
DOI
https://doi.org/10.1007/s10665-015-9817-7

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