管道直径和初始水深对黏土质海床管道局部冲刷特性的影响  

Influence of Pipeline Diameter and Initial Water Depth on Local Scour Characteristics of Pipelines on Clay Seabed

作　　者：张美娜 韩翔希 翟煜 齐国胜 任地 蒙占彬 ZHANG Meina;HAN Xiangxi;ZHAI Yu;QI Guosheng;REN Di;MENG Zhanbin(Guangxi Key Laboratory of Ocean Engineering Equipment and Technology,Beibu Gulf University,Qinzhou 535011,Guangxi,China)

机构地区：[1]北部湾大学广西海洋工程装备与技术重点实验室,广西钦州535011

出　　处：《中国海洋平台》2025年第1期41-51,共11页China offshore Platform

基　　金：国家自然科学基金(编号:52201304);广西科技重大专项(编号:桂科AA22068105)。

摘　　要：基于有限体积法,采用SST k-ω模型、Herschel-Bulkley非牛顿流体模型和流体体积(Volume of Fluid,VOF)两相流模型建立海底管道局部冲刷的二维计算流体动力学(Computational Fluid Dynamics,CFD)模型,以管道直径和初始水深为变量开展数值模拟研究。分析管道两侧床面压力特征、冲刷坑形态、冲刷深度历时曲线、阻力系数历时曲线、管道局部速度分布等内容,揭示不同管道直径和初始水深对海底管道局部冲刷特性的影响规律。结果表明:在黏土质海床环境下海底管道局部冲刷受管道直径影响显著,管道直径越大,管道局部冲刷坑宽度和深度越大,沉积丘向管道下游移动距离越远;初始水深对黏土质海床环境下海底管道局部冲刷产生一定的影响,随着初始水深的增加,管道局部极限平衡冲刷深度减小,管道下游床面形态受初始水深影响较为明显。Based on the finite volume method,a two-dimensional Computational Fluid Dynamics(CFD)model of local scour of submarine pipeline is established by SST k-ω model,Herschel Bulkley non-Newtonian fluid model and Volume of Fluid(VOF)two-phase flow model,using the pipeline diameter and initial water depth as the variable parameters for the numerical simulation.The characteristics of bed pressure on both sides of the pipeline,scour hole morphology,scour depth duration curve,resistance coefficient duration curve and local velocity distribution of the pipeline are analyzed,and the rule of the influence of pipeline diameter and initial water depth on the local scour characteristics of the submarine pipelines is revealed.The results show that:the local scour of the submarine pipelines in clay seabed environment is significantly affected by pipeline diameter,the larger the diameter of the pipeline,the greater the width and depth of the local scour holes,the further the sediment mound moves to the downstream direction of the pipeline;the initial water depth is of certain influence on the local scour of the submarine pipelines in the clay seabed environment,with the increase of the initial water depth,the local limit equilibrium scour depth of the pipeline decreases,and the downstream bed morphology of the pipeline is obviously affected by the initial water depth.

关 键 词：海底管道 局部冲刷 黏土 管道直径 初始水深 计算流体动力学 

分 类 号：TE973[石油与天然气工程—石油机械设备] P75[天文地球—海洋科学]