Extension of k-ω turbulence closure to two-phase sediment transport modelling: application to oscillatory sheet flows

Amoudry, Laurent O.. 2014 Extension of k-ω turbulence closure to two-phase sediment transport modelling: application to oscillatory sheet flows. Advances in Water Resources, 72. 110-121. 10.1016/j.advwatres.2014.07.006

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Abstract/Summary

A number of turbulence closure schemes can be employed to numerically investigate near-bed wave boundary layer and sediment transport problems. We present an extension of the widely used k-ω turbulence model to two-phase sediment transport modelling. In this model, a transport equation is solved for the turbulence specific dissipation rate ω. For two-phase models, this equation is similar to the one for clear fluids with an additional term due to inter-phase interaction terms, which we will discuss. The new k-ω model is then applied to wave and current sheet flows. We compare the numerical results from the k-ω model and from an existing k-ε model against sheet flow experimental data collected in oscillatory water tunnels. Both models provide broadly similar numerical results. Nevertheless, the k-ω and k-ε models display different behaviour around flow reversal, and neither is able to fully reproduce observed suspension peak at flow reversal.

Item Type:	Publication - Article
Digital Object Identifier (DOI):	10.1016/j.advwatres.2014.07.006
ISSN:	03091708
Additional Keywords:	Two-phase flow; Sediment transport; Turbulence closure; Sheet flows; Modelling
Date made live:	23 Jul 2014 09:11 +0 (UTC)
URI:	https://nora.nerc.ac.uk/id/eprint/507886

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