Abstract
A turbulence-resolving two-phase Eulerian model for sediment transport is developed by extending the new solver twoPhaseEulerSedFoam. The development and validation of a turbulence-averaged multi-dimensional two-phase model for sediment transport, twoPhaseEulerSedFoam version 1.0, was recently completed and the model was dissem- inated to the research community via the Community Surface Dynamics Modeling System (CSDMS) model repository. In order to resolve flow turbulence and turbulence-sediment interaction, large eddy simulation (LES) with subgrid tur- bulence closure is further implemented and simulation is carried out in three-dimension. Closures on particle stresses are based on kinetic theory of granular flow for binary collision and phenomenological closure for stresses of enduring contact. One of the main concerns in a turbulence-resolving simulation is regarding the domain size and finest grid resolution so that the flow domain is sufficiently large to contain the largest eddy and meanwhile, a significant amount of the turbulence energy is resolved appropriately. This paper discusses these crucial issues for typical sheet flow condition in oscillating water tunnels. Preliminary results also show that the model is able to capture the sediment burst events during the flow reversal.
Highlights
Multi-dimensional sediment transport occurs in many coastal applications such as scour (Amoudry and Liu, 2009), momentary bed failure (Madsen, 1974; Sleath, 1999; Foster et al, 2006) and bedforms (e.g. Penko et al, 2010)
Using typical flow condition for sheet flow sediment transport in oscillating water tunnel, we critically examine the criteria for domain size and mesh size in three spatial dimensions in order to carry out an appropriate turbulence-resolving two-phase sediment transport simulation that follows the large eddy simulation (LES) modeling guidelines
By modifying the fluid turbulence model to standard Smagorinsky model, and ignoring the effect of fluid turbulence on sediment granular temperature, the modified model is directly applied to investigate the necessary domain size and grid size in order to carry out an appropriate turbulence-resolving simulation for typical sheet flow condition in oscillating water tunnel
Summary
A turbulence-resolving two-phase Eulerian model for sediment transport is developed by extending the new solver twoPhaseEulerSedFoam. One of the main concerns in a turbulence-resolving simulation is regarding the domain size and finest grid resolution so that the flow domain is sufficiently large to contain the largest eddy and a significant amount of the turbulence energy is resolved appropriately. This paper discusses these crucial issues for typical sheet flow condition in oscillating water tunnels.
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