Abstract:
Scour is one of the most protruding factors in bridge failures across the whole world. In this paper, we have studied about the scouring around bridge piers of different hydrodynamic geometries such as circular, square, diamond, hexagonal and airfoil. And it has been done with the help of using FLOW-3D software. In this analysis we have tried to investigate whether Flow-3d can accurately predict the scouring geometry, the depth and deposition of sand around bridge piers or not. In this study mainly the scouring in case of non-cohesive bed sediment was simulated using the software where both the qualitative and quantitative analysis have been presented. And the software uses Reynold’s Average Navier Stokes (RANS) equation closed with k-€ model with second order accurate turbulence method. The computational model has established stable and converged solution for different shapes of hydrodynamic structures with a constant time interval and fixed bed load coefficient and the result is satisfactory enough to build up a consensus about the scouring pattern and depth as well as the deposition in some portion around the piers. The study gives a conclusion which suggest that among the different five shapes (circular, square, diamond, hexagonal, airfoil), for circular shape the scour depth is satisfactory than other diamond and hexagonal shape but in case of airfoil scouring is so high that it didn’t catch our thought anyway. Besides these, it also shows that scouring is higher in the upstream of the piers than the downstream. Another major finding of our work is that there are some limitations in the Flow-3d software to predict the scouring depth.
