张美娜, 韩翔希, 翟煜, 等, xxxx. 来流速度和土体强度对黏土质海床管道局部冲刷特性影响研究[J]. 海岸工程, x(x): xx-xx. doi: 10.12362/j.issn.1002-3682.20240305001.
    引用本文: 张美娜, 韩翔希, 翟煜, 等, xxxx. 来流速度和土体强度对黏土质海床管道局部冲刷特性影响研究[J]. 海岸工程, x(x): xx-xx. doi: 10.12362/j.issn.1002-3682.20240305001.
    ZHANG M N, HAN X X, ZHAI Y, et al, xxxx. Study on the influence of inflow velocity and soil strength on local scour characteristics of clay seabed pipelines[J]. Coastal Engineering, x(x): xx-xx. DOI: 10.12362/j.issn.1002-3682.20240305001
    Citation: ZHANG M N, HAN X X, ZHAI Y, et al, xxxx. Study on the influence of inflow velocity and soil strength on local scour characteristics of clay seabed pipelines[J]. Coastal Engineering, x(x): xx-xx. DOI: 10.12362/j.issn.1002-3682.20240305001

    来流速度和土体强度对黏土质海床管道局部冲刷特性影响研究

    Study on the Influence of Inflow Velocity and Soil Strength on Local Scour Characteristics of Clay Seabed Pipelines

    • 摘要: 本文基于SST k-ω模型、Herschel-Bulkley黏土模型和VOF两相流模型建立海底管道局部冲刷的二维CFD模型,以来流速度U和土体强度τ0为变量参数开展数值模拟研究。通过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、管道局部速度分布等内容,分析了不同来流速度(U)和土体强度(τ0)对海底管道局部冲刷特性影响的规律。研究结果表明:①黏土质海床环境下海底管道局部冲刷受来流速度影响显著。随着来流速度的增加,管道局部极限平衡冲刷深度与冲刷坑宽度均增大,平衡冲刷深度增幅与流速增幅的比率整体呈减缓趋势。②黏土质海床环境下海底管道局部冲刷受土体强度影响显著。随着土体强度的增大,海床渗流力减弱,管道局部极限平衡冲刷深度减小,下游沉积丘距离管道轴心越近。当土体强度大于等于300 Pa时,管道底部与海床之间的间隙较难形成。

       

      Abstract: Based on SST k-ω model, Herschel-Bulkley clay model and VOF two-phase flow model, a two-dimensional CFD model of local scour of submarine pipelines is established in this paper, the numerical simulation was conducted on the variable parameters of inflow velocity U and soil strength τ0. The characteristics of bed pressure on both sides of the pipeline, scour hole morphology, scour depth duration curve and local velocity distribution of the pipeline are analyzed, the law of influence of inflow velocity and soil strength on local scour characteristics of submarine pipelines is revealed. The results show that: firstly, the local scour of submarine pipelines in the clay seabed environment is significantly affected by the inflow velocity. As the inflow velocity increases, both the limit equilibrium scour depth and scour hole width increase, the ratio of the increase in the depth of the equilibrium scour to the increase in the velocity shows a slowing trend. Secondly, the local scour of submarine pipelines in the clay seabed environment is significantly affected by the soil strength. As the soil strength increases, the seepage flow of seabed is weakened, the limit equilibrium scour depth of the pipeline decreases, the closer the mound is to the pipe axis. When the soil strength is ≥300 Pa, it is harder to create a gap between the bottom of the pipe and the seabed.

       

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