Numerical modeling of scouring around rectangular abutment

فاقد چكيده فارسي

Present paper illustrates results of numerical study on scouring phenomenon around rectangular cross section, impermeable and non-submerged bridge abutment with the vertical attitude to the flow axes. In this study the CFD program namely SSIIM 2.0 has been used to simulate the scouring around the abutment. The SSIIM 2.0 numerical model is based on the finite volume method, using an unstructured grid with dominant hexahedral cells. Based on a sensitivity analysis on turbulence model the k-ε turbulence model with some RNG extensions was used to predict turbulence. The SIMPLE method was used to compute the pressure and Power Law scheme was used to discretize the equations. The sediment transport was computed as bed load in addition to solving the convection-diffusion equation for suspended sediment transport. In additions, variety of grids was applied in order to numerical simulation, and the best grid was chosen by means of available experimental results. Finally, bed changes and scouring phenomena caused by numerical simulation were compared with experimental results. It could be found from achieved results that scouring simulation around the rectangular abutment could be done well by SSIIM 2.0 numerical modeling