Abstract
This study describes a numerical model developed to simulate flow and bed deformation around river hydraulic structures. The numerical analysis for fluid solves the Reynolds-averaged Navier-Stokes (RANS) equations coupled with the Volume of Fluid (VOF) method and k-omega SST turbulence closure model. The analysis for fluid is carried out using the open source computational fluid dynamics software package OpenFOAM. The temporal change in bed topography is calculated by coupling a stochastic model for sediment pick-up, deposition, and transition using a momentum equation of sediment particles in order to account for the effect of nonequilibrium sediment transport. The numerical model was applied to the scour phenomenon upstream of a slit weir, which physically simulates sediment releasing from a dam gate. A comparison between the numerical results and experimental data indicated that the model can reproduce the scour geometry around the slit weir with sufficient accuracy.
