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首页> 外文期刊>Coastal engineering >Numerical investigation of local scour beneath a sagging subsea pipeline in steady currents
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Numerical investigation of local scour beneath a sagging subsea pipeline in steady currents

机译：稳定水流下沉海底管道下方局部冲刷的数值研究

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摘要

Two dimensional (2-D) numerical simulations are conducted to predict scour below the midsection of the suspended span of a pipeline that sags naturally into a scour pit. The deflection of the pipeline is calculated based on the suspension length (or span length) of the pipeline, which is predicted by an empirical formula for the length of the scour pit. The general properties of the scour process are investigated for various pipeline properties, pipeline embedment depths and Shields parameters. The effect of each of these parameters on pipeline sagging are combined into one non-dimensional sagging parameter. A touchdown time is defined as the time when the pipeline touches the bottom of the sand pit. Empirical formulae are proposed for predicting the final scour depth at touchdown and the time scale required for touchdown. It is found that the final sagging depth is a function of the sagging parameter and the Shields parameter, whilst the touchdown time is only a function of the sagging parameter. A formula is also developed for predicting the time history of scour depth prior to touchdown. Collectively, the empirical formulae and numerical simulations are found to be in reasonable agreement with an existing theoretical model available in the literature.
机译：进行了二维（2-D）数值模拟，以预测自然下陷于冲水坑中的管道的悬挂跨度的中段以下的冲水。管道的挠度是根据管道的悬挂长度（或跨度长度）计算的，该悬挂长度由冲刷坑的长度的经验公式预测。研究了冲刷过程的一般属性，包括各种管道属性，管道嵌入深度和Shields参数。这些参数中的每一个对管道垂度的影响被组合为一个无量纲的垂度参数。着陆时间定义为管道接触沙坑底部的时间。提出了经验公式来预测着陆时的最终冲刷深度和着陆所需的时间尺度。发现最终下垂深度是下垂参数和Shields参数的函数，而触地时间仅是下垂参数的函数。还开发了一个公式，用于预测着陆前冲刷深度的时间历史。总的来说，经验公式和数值模拟与文献中现有的理论模型合理地吻合。

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  • 来源
    《Coastal engineering》 |2018年第6期|106-118|共13页
  • 作者

    Ajdehak Esmaeil; Zhao Ming; Cheng Liang; Draper Scott;

  • 作者单位

    Western Sydney Univ, Sch Comp Engn & Math, Penrith, NSW 2751, Australia;

    Western Sydney Univ, Sch Comp Engn & Math, Penrith, NSW 2751, Australia;

    Univ Western Australia, Sch Civil Environm & Min Engn, Crawley, WA 6009, Australia;

    Univ Western Australia, Sch Civil Environm & Min Engn, Crawley, WA 6009, Australia;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Local scour; Numerical simulation; Subsea pipeline;

    机译：局部冲刷;数值模拟;海底管线;

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