...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Hydroinformatics >Three-dimensional numerical investigation on the influence of geometric shape on flow in river bends
【24h】

Three-dimensional numerical investigation on the influence of geometric shape on flow in river bends

机译：几何形状对河道水流影响的三维数值研究

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

To investigate the influences of river bend geometry on flow structures, three-dimensional simulations were carried out. The influence of aspect ratio, channel sinuousness and curvature ratio were investigated. Simulation results show that with an increasing of channel aspect ratios, the streamwise variation of flow velocities decreases significantly, which is not the case for the spanwise direction. Simulation results also reveal the significant influence of the curvature ratio on the redistribution of primary flows. The streamwise variation of free-surface and bottom-wall velocities was compared and the phase differences between them was identified, which was described as anti-phase and out-of-phase patterns. Deep-water channels with an aspect ratio of 0.15 show significant phase-lag of flow velocities compared with channel geometry, this newly observed phenomenon implies the shift of the peak scouring point in fluvial river meanders. For the first time to our knowledge, the streamwise and spanwise variation of primary and secondary flow strength, as well as their spatial derivatives, are quantitatively provided, which are valuable for theoretical studies. It is also found that the widely adopted assumption that the streamwise velocity component is one order magnitude larger than the spanwise, is only valid for river bends with small curvatures and aspect ratios.
机译：为了研究河弯几何形状对流动结构的影响，进行了三维模拟。研究了长宽比，通道弯曲度和曲率比的影响。仿真结果表明，随着通道长宽比的增加，流速的沿流向变化显着减小，而沿展向方向则不是这种情况。仿真结果还揭示了曲率比对一次流动的重新分布的重大影响。比较了自由表面和底壁速度的流向变化，并确定了它们之间的相位差，这被描述为反相和异相模式。与通道几何形状相比，深宽比为0.15的深水通道显示出显着的流速相位滞后，这种新观察到的现象暗示着河流冲流中峰值冲刷点的移动。据我们所知，这是第一次，一次和二次流动强度沿流向和跨度的变化，以及它们的空间导数被定量地提供，这对于理论研究是有价值的。还发现，广泛采用的假设是，河道速度分量比跨度方向大一个数量级，仅适用于曲率和纵横比较小的河道。

著录项

  • 来源
    《Journal of Hydroinformatics》 |2017年第6期|666-685|共20页
  • 作者

    Xu Dong; Ji Chunning; Bai Yuchuan; Song Xiaolong;

  • 作者单位

    Tianjin Univ, State Key Lab Hydraul Engn Simulat & Safety, Tianjin 300072, Peoples R China;

    Tianjin Univ, State Key Lab Hydraul Engn Simulat & Safety, Tianjin 300072, Peoples R China;

    Tianjin Univ, State Key Lab Hydraul Engn Simulat & Safety, Tianjin 300072, Peoples R China;

    Tianjin Univ, State Key Lab Hydraul Engn Simulat & Safety, Tianjin 300072, Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    flow structures; geometric shape; river bends; three-dimensional simulation;

    机译：流动结构几何形状河道弯曲三维模拟;

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号