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Analysis of drag and lift forces and evaluation of scour around bridge structures are necessary to
assess risk of bridge failure during storms and floods. Simulation of scour-hole formation under the bridge
deck and around the bridge piers, due to sediment entrainment and transport caused by flooding flow
conditions, is of significant interest to computational fluid dynamics (CFD) and hydraulics researchers. This
study is focused on simulation of 3-D open channel turbulent flow over an inundated bridge deck to obtain the
final shape and size of the scour-hole. This 3-D study extends the previous 2-D simulation scouring
methodology. Solutions for flow field and turbulence, using an effective bed roughness value, are based on the
Reynolds Averaged Navier-Stokes (RANS) equations, and a k– turbulence closure model using a commercial
CFD code. An iterative computational methodology is developed to predict the equilibrium 3-D scour-hole
using a single phase model moving boundary formulation, based on an empirical correlation for critical shear
stress to determine the condition for sediment removal. The computational model has demonstrated capability
to reach a converged solution for the equilibrium scour-hole shape and size that agree reasonably well with
experiments. The method provides a basis for implementing enhanced particle entrainment physics and other
scour model improvements in well benchmarked commercial CFD software.