FLOW-3D‘s Sediment Scour Model offers a powerful approach to characterizing the evolution of multi-species sediments height changes under the forcing of river hydraulics and complex pier and topography configurations. The sediment scour model is a three dimensional tool analysis, which integrates with FLOW-3D advanced turbulence models, the model however is also fully integrated with FLOW-3D‘s Shallow Water Model for larger scale sediment and scour analyses.
Physics captured include deposition, packing, entrainment and drift-flux mechanisms, and in FLOW-3D v11 the morphological evolution of the sediment layer is now completely FAVORized, allowing for greater accuracy and full visualization of the bed net height changes. Available outputs include the packed sediment net evolution spatially and in time, but also include suspended sediment in the fluid or even shear stresses at the bed/fluid interface.
Modeling Hydraulic Control Structures
In addition to the flow rates and detail of hydraulic behaviors associated with the control gate structures and powerhouse operation, FLOW-3D‘s sediment and scour model allows users to identify regions of high scour both near the control structure and further downstream in the vicinity of the bridge piers.
Bridge Pier Simulations
The first video shows a FLOW-3D simulation of the erosion that occurs around a group of three 2.4 m diameter piers as river water flows past at 1.5 m/s. The river depth is 15.8 m and the mean sediment size was presumed to be 0.35 mm.