贴壁双海底管道绕流研究

Flow Around Dual Offshore Pipeline Near Wall

针对单向水流作用下双海底管道绕流问题,基于N-S方程和标准k-ε紊流模型,对2管间距在1D<Ls<10D情况下的双海底管道绕流时均水动力场进行计算模拟,得到不同断面的流速分布,与试验结果比较接近;应用模拟手段分析间隔内涡旋特征随间隔比的变化规律,并对各管两端压差随间隔变化规律进行探讨,发现在10D范围内,上游管压差远大于下游管压差,上游管更易于冲刷和悬空。

In order to investigate the flow characteristics of flow around dual offshore pipeline which is often used in engineering,a numerical model which solves N-S equations and standard k-ε were applied to simulate the flow around dual offshore pipeline near wall in various spaces,1D〈 Ls 〈10 D. The velocity distributions at various cross sections obtained by numerical model were in agreement with experimental results. In addition,the effect of spaces on vortexes and pressure on seabed were discussed. It is found that the pressure gap of upstream pipe is larger than the value of downstream pipe. This implies that the seabed below upstream pipe is easier to be scoured than the region below downstream pipe and should be paid more attention.