中文摘要：

为了预言本地人，在圆柱的桥墩，计算液体动力学(CFD ) 和沉积运动和运输的理论附近搜索洞和它的评估被采用执行数字模拟。在数字方法，平均时间的 Reynolds 海军司烧方程和标准 k- 模型首先被用来在在河床上修理的桥墩附近模仿三维的流动领域。短暂砍当处理沉积开始和运输时，河床上的应力被当作关键水动力学机制。然后，河床容量的沉积运输被计算，由河床高度和配置的修正列在后面。边界适应网孔技术被采用与改变的河床边界修改格子系统。本地人的进化在圆柱的桥墩附近搜索被介绍。数字结果在搜索的墩期间代表流动模式和机制，与最大值的好预言与测试结果相比搜索洞深度。

英文摘要：

In order to predict the local scour hole and its evaluation around a cylindrical bridge pier, the computational fluid dynamics （CFD） and theories of sediment movement and transport were employed to carry out numerical simulations. In the numerical method, the time-averaged Reynolds Navier-Stokes equations and the standard k-e model were first used to simulate the three-dimensional flow field around a bridge pier fixed on river bed. The transient shear stress on river bed was treated as a crucial hydrodynamic mechanism when handling sediment incipience and transport. Then, river-bed volumetric sediment transport was calculated, followed by the modification of the river bed altitude and configuration. Boundary adaptive mesh technique was employed to modify the grid system with changed river-bed boundary. The evolution of local scour around a cylindrical bridge pier was presented. The numerical results represent the flow pattern and mechanism during the pier scouring, with a good prediction of the maximum scour hole depth compared with test results.