Numerical modeling of local scour below a piggyback pipeline in currents
Numerical modeling of local scour below a piggyback pipeline in currents
复制标题
DOI：
10.1061/(asce)0733-9429(2008)134:10(1452
复制
发表时间：
2008-10-01
期刊：
影响因子：
--
通讯作者：
Cheng, Liang
中科院分区：
文献类型：
--
作者：
Zhao, Ming;Cheng, Liang
对恒定流中背驮式管道下局部冲刷进行了数值研究。背负式管道包括以所谓的背负式构造布置的两个管道，其中小管道位于大管道的正上方。采用有限元法求解雷诺平均纳维尔-斯托克斯方程和悬沙浓度输运方程。通过求解泥沙质量守恒方程确定床面冲刷剖面。数值模型进行了验证，对实验数据在文献中的冲刷下一个单一的管道。对直径比[小管径（d）与大管径（D）]为0.2和差距（G，两个管道之间）与大管径比G/D在0.0至0.5范围内进行计算。研究发现，差距比对水流和冲刷剖面有显著影响。
Local scour below a piggyback pipeline in steady currents is investigated numerically. A piggyback pipeline comprises two pipelines that are arranged in the so-called piggyback configuration with the small pipeline being located directly above the large pipeline. The Reynolds-averaged Navier-Stokes equations and the transport equation for suspended sediment concentration are solved using a finite element method. The bed scour profile is determined through solving sediment mass conservation equation. The numerical model is validated against experimental data available in literature on scour below a single pipeline. Computations are carried out for the diameter ratio [the small pipe diameter (d) to the larger one (D)] of 0.2 and the gap (G, between the two pipelines) to the large diameter ratio G/D ranging from 0.0 to 0.5. It is found that the flow and the scour profiles are influenced significantly by the gap ratio.