NUMERICAL MODELLING OF LOCAL SCOUR BELOW OFFSHORE PIPELINES

海上管道下局部冲刷数值模拟。本研究将建立一个受稳定水流和波浪作用的海上管道下随时间变化的局部冲刷数值模型。目前，海上油气行业和研究界还没有这样的模型。相反，设计工程师必须使用简单的经验公式来估计复杂环境条件下的冲刷潜力。这可能导致不安全或过于保守的设计。因此，本文所建立的模型将直接影响到海上管道的稳定性设计。设计将更加安全可靠，改进设计可能会降低成本。

NUMERICAL MODELLING OF LOCAL SCOUR BELOW OFFSHORE PIPELINES. This research will develop a numerical model for time-dependent local scour below offshore pipelines subject to steady currents and waves. No such model is currently available in the offshore oil and gas industry and the research community. Instead, design engineers have to use simple empirical formulae to estimate the scour potential in complex environmental conditions. This may result in unsafe or over conservative designs. Therefore the model developed in this project will have direct impact on the stability design of offshore pipelines. The design will be safer and more reliable, and improved design may lead to a reduced cost.