Numerical investigation of sheet flow driven by a near-breaking transient wave using SedFoam

• DOI: 10.1016/j.euromechflu.2022.07.002
• Publication Date: 2022-07-21T16:31:01Z
• Authors: Marie-Pierre C. D...; Yeulwoo Kim; Ryan S. Mieras; Timu W. Gallien
• Keywords: Shear velocity; Hyperconcentrated flow

Sheet flow driven by a near-breaking transient wave is numerically investigated using SedFoam, two-phase Eulerian sediment transport model in the OpenFOAM framework. SedFoam resolves full profile of processes within bottom boundary layer based on closures for intergranular stresses and fluid–particle interactions. Compared with large-scale flume data, good agreements are obtained streamwise velocity profiles, concentration sheet thickness. Model results show near-bed evolution layer. Intense suspension trailing crest generates stable density stratification that dampens turbulent kinetic energy contributes to decreasing bed shear stress. Results suggest buoyant flux dominates dissipation after passing crest, coinciding reduction The instantaneous upper bound exists different log-law regimes under wave, giving rise highly dependent variable wall unit. effect shape parameter bedload studied where predicted time-varying optimal yields agreement compared directly modeled bedload. Modeled rates demonstrate reduced stress caused limits suspended load-dominant mode.