Bridge Piers

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.┬áThe 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.

Bridge scour simulation using FLOW-3D

Scour and deposition evolution around a pier system.

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.

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.