摘要
以西藏林芝八一大桥为模型,采用大涡模拟,得到了流场的压力云图、瞬时速度流线图、涡量图。结果表明:流体开始流过桥墩时,圆柱壁面压力最大点及最低点分别出现在前驻点与圆柱壁面上下两侧;流体充分流动,中间的圆柱压力最大点发生了变化;流体绕中间圆柱的流动特性同时受到上游圆柱与下游圆柱的作用;漩涡脱落圆柱向下游运动,受流体流动的影响与自身的剪切运动,涡能量不断减少,最后消失;运用大涡模拟能够很好的预测圆柱绕流问题,可以为高原实际工程的应用提供参考。
Taking Nyingchi Bayi bridge in Tibet as a model and using the large eddy simulation（LES）,this paper would obtain the pressure cloud of flow field,the instantaneous velocity streamline and the vorticity map.The results showed when the fluid started to flow through the pier,the maximum and minimum points of the wall pressure would appear on the upper and lower sides of the front and the wall,respectively.When the fluid had fully flowed,the maximum pressure of center cylinder would be changed.The flow characteristics of fluid around the center cylinder would be influenced by upstream cylinder and downstream cylinder simultaneously.When the vortex was shedding the cylinder and moving to the downstream,the vortex energy would decrease and finally disappear influenced by the fluid flow and its own shear movement.The large eddy simulation could predict the flow around the cylinder,which could provide references for the application of plateau engineering.
出处
《人民珠江》
2017年第10期47-50,共4页
Pearl River
基金
基金项目:高海拔地区水电站安全运行监测与诊断调查研究(szjj2015-040)
关键词
圆柱绕流
大涡模拟
流动特性
涡量
flow around a circular cylinder
large eddy simulation
flow characteristics
vortex
