单圆柱桥墩冲刷的三维数值模拟  

A Numerical Simulation of Three-dimensional Flow around a Circular Cylinder Using Flow-3D Software

作　　者：吉鸿敏[1] 张新燕[1] 朱德兰[1] 

机构地区：[1]西北农林科技大学水利与建筑工程学院,陕西杨陵712100

出　　处：《中国农村水利水电》2015年第11期152-155,160,共5页China Rural Water and Hydropower

基　　金："十二五"国家科技支撑计划项目(2011BAD29B00)

摘　　要：桥梁防护中由于桥墩周围的绕流冲刷极其复杂,迄今对该绕流流态及其与河床冲刷关系的认识仍不完善。为了深入分析圆柱桥墩周围的三维水流结构及冲刷现象,利用Flow-3d三维模拟软件对不同流速下的圆柱绕流流态进行数值模拟并和模型实验对比另对圆柱桥墩周围的冲刷做了初步的模拟分析。结果表明,Flow-3d可以清楚地反映桥墩周围的水流流态并通过了模型实验结果验证。说明Flow-3d可以准确模拟单圆柱绕流并获得流场的三维瞬时流速和冲刷现象,本研究可为河床中桥墩附近的冲刷计算和防护设计提供重要的参考。Due to the complexity of local scour and flow around cylindrical piers in the field of bridge protection, flow patterns around bridge piers and their relationship with bed scours are still unknown. In order to analyze three-dimensional flow structure around piers and scour phenomenon further, the water flow at three velocities around a single cylinder is simulated by using Flow-3D soft ware, and the simulation results are compared with the model experiments. The sediment scour around a single pier is also simulated. The simulation results are well verified by the model experiments. The results indicate that Flow-3d can be used to simulate the flow around a cylinder and obtain the three-dimensional instantaneous velocity accurately. This study can provide valuable ideas for the bed scour calculation and protection design.

关 键 词：单圆柱绕流 Flow-3d 数值模拟 三维流场 泥沙冲刷 

分 类 号：O351.2[理学—流体力学]