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首页> 外文期刊>Ocean Engineering >Numerical simulation of a partially buried pipeline in a permeable seabed subject to combined oscillatory flow and steady current
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Numerical simulation of a partially buried pipeline in a permeable seabed subject to combined oscillatory flow and steady current

机译：振荡流与稳态电流共同作用下可渗透海床部分埋管的数值模拟

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摘要

Hydrodynamic forces exerting on a pipeline partially buried in a permeable seabed subjected to combined oscillatory flow and steady current are investigated numerically. Two-dimensional Reynolds-Averaged Navier-Stokes equations with a k-ω turbulent model closure are solved to simulate the flow around the pipeline. The Laplace equation is solved to calculate the pore pressure below the seabed with the simulated seabed hydrodynamic pressure as boundary conditions. The numerical model is validated against the experimental data of a fully exposed pipeline resting on a plane boundary under various flow conditions. Then the flow with different embedment depths, steady current ratios and KC numbers is simulated. The amplitude of seepage velocity is much smaller than the amplitude of free stream velocity as expected. The normalized Morison inertia, drag and lift coefficients based on the corresponding force coefficients of a fully exposed pipeline are investigated. The normalized Morison force coefficients reduce almost linearly with the increase of embedment depth and that the KC only has minor effect on the normalized Morison coefficients. It is also found that the permeable seabed condition causes a slight increase on the inline force and has a little effect on the lift force, compared with corresponding conditions in an impermeable bed.
机译：数值研究了作用在部分掩埋在可渗透海床中的管道上的流体动力，该管道受到振荡流和稳定电流的共同作用。求解具有k-ω湍流模型闭合的二维雷诺平均Navier-Stokes方程，以模拟管道周围的流动。求解拉普拉斯方程，以模拟海床水动力压力为边界条件，计算海床下方的孔隙压力。根据在各种流动条件下搁置在平面边界上的完全裸露的管道的实验数据对数值模型进行了验证。然后模拟了具有不同嵌入深度，稳定电流比和KC数的流。渗透速度的幅度比预期的自由流速度的幅度小得多。研究了基于完全裸露管道的相应力系数的归一化莫里森惯性，阻力和升力系数。归一化的莫里森力系数随嵌入深度的增加几乎呈线性减小，并且KC对归一化的Morison系数影响很小。还发现，与不可渗透床中的相应条件相比，可渗透海床条件导致轴向力略有增加，而对升力的影响很小。

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  • 来源
    《Ocean Engineering》 |2011年第10期|p.1225-1236|共12页
  • 作者

    Hongwei An; Liang Cheng; Ming Zhao;

  • 作者单位

    School of Civil and Resource Engineering, University of Western Australia, 35 Stirling Highway, Crawley, Western Australia 6009, Australia;

    School of Civil and Resource Engineering, University of Western Australia, 35 Stirling Highway, Crawley, Western Australia 6009, Australia;

    School of Civil and Resource Engineering, University of Western Australia, 35 Stirling Highway, Crawley, Western Australia 6009, Australia;

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  • 正文语种 eng
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  • 关键词

    finite element method; hydrodynamic forces; pipeline; seepage flow; combined oscillatory flow and steady; current;

    机译：有限元法;水动力;管道;渗流;振荡与稳态相结合;电流;

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