Author(s): Thuzar Aung; Erik Toorman
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Keywords: No Keywords
Abstract: In a open channel flow with very high sediment concentrations (>1g/l), the flow exhibits modulation of turbulence due to fluid-particle interactions and particle-particle interactions. Low-Reynolds effects by two- and four-way coupling of sediment-turbulence interactions lead to turbulence damping and energy dissipation in the inner boundary layer (IBL). As a result, the IBL thickens in the presence of particles near the bottom. In large-scale applications, the IBL thickness where low-Reynolds modifications to turbulence occur is not resolved. The numerical simulation of total sediment transport in practical scale applications is typically done by solving suspended transport in the water column, ignoring the IBL thickness and imposing bottom boundary conditions applicable only to clear water. The unresolved processes within the IBL have to be incorporated by the adaptation of near-bottom boundary conditions such that the IBL layer can be bridged with adapted wall functions. To achieve this, a new low-Reynolds turbulence model is necessary to be developed to define new boundary conditions for sediment-laden flow. Therefore, a new low-Reynolds
Year: 2024