Local scour around seabed oil, gas or water pipelines can critically affect their stability. Accurate estimation of scour around pipelines is therefore a key topic of research for marine engineers. This paper presents results from a numerical study of clear-water scour depth below a submarine pipeline for a range of steady flow conditions. The flow field around a pipeline under scour equilibrium conditions was numerically simulated by solving the Reynolds-averaged Navier–Stokes equations with the standard k–e turbulence closure. The flow discharge through the scour hole for various flow conditions was then investigated, and the results were used to establish the relationship between the flow discharge and the maximum scour depth. By incorporating the Colebrook–White equation, the bed shear stress was obtained and an iterative method was developed to predict the scour depth around the pipeline. The calculated scour depths using the proposed method agreed well with laboratory measurements, with the average ...

中文翻译：

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改善海底管道周围冲刷的预测

海底石油，天然气或水管道周围的局部冲刷会严重影响其稳定性。因此，对管道周围冲刷的准确估算是海洋工程师研究的关键主题。本文介绍了在一定范围的稳定水流条件下，海底管道下方的清水冲刷深度的数值研究结果。通过求解具有标准k–e湍流闭合的雷诺平均Navier–Stokes方程，对冲刷平衡条件下管道周围的流场进行了数值模拟。然后研究了在各种流量条件下通过冲刷孔的流量排放，并使用结果建立了流量与最大冲刷深度之间的关系。通过合并Colebrook–White方程，获得了床层剪切应力，并开发了一种迭代方法来预测管道周围的冲刷深度。使用建议的方法计算的冲刷深度与实验室测量值非常吻合，平均...