SIMULATION OF 3D FLOW AND BED SHEAR STRESS FIELDS AROUND A CIRCULAR PIER

摘要

Water flowing around piers forms complex three-dimensional (3D) flow patterns that induce local scour on the loose bed boundary. The large-eddy simulation (LES) approach with Smagorinsky's subgrid-scale turbulence model is employed for computing the 3D flow and bed shear stress fields. The simulated results are compared with experimental data. To investigate the scour mechanism around the pier, the flow fields in various fixed scour holes with similar shape are simulated, and the simulated results of bed shear stress and downflow are discussed herein.