摘要
丁坝(群)附近的局部流场变化是引起丁坝局部冲刷的根本原因。为认清丁坝附近的流场分布规律,运用二维水深平均k-ε紊流模型,采用有限元的方法对控制方程进行离散,通过计算得到了不同工况下绕流丁坝附近流场的分布。结果表明,丁坝回流区长度随着坝长的增加而增加;直角坝头丁坝比圆形坝头丁坝具有更强的扰流作用;丁坝群对水流扰动作用不及单丁坝。这些结论对丁坝的防护设计和施工工艺具有一定的理论和实践指导意义。
local directional change of the flow field in the vicinity of spur dike would result in local scouring of spur dike. In order to find out the distribution pattern of the flow field, a 2D depth-averaged k-ε turbulence model and finite dement method were used to simulate the tlow field in the vicinity of spur dike under various operation modes. By comparing and analyzing the simulating results, it comes into conclusions that the length of back flow increases with the length of spur dike; the flow disturbing around the spur dike with right-angle head is greater than that with circular head; and that group spur dikes manifest weaker perturbation than single spur dike due to their impaction on flow. These conclusions are practically useful to the design and construction of spur dike.
出处
《公路交通科技》
CAS
CSCD
北大核心
2006年第11期10-14,共5页
Journal of Highway and Transportation Research and Development
基金
交通部西部交通建设科技资助项目(200331895019)
关键词
绕流丁坝
流场
数值模拟
K-Ε紊流模型
cireumfluent spur dike
flow field
nuraerical simulation
k-ε turbulence model
