Sand erosion in pipelines during offshore oil and gas exploitation and transportation can lead to serious equipment failures, considerable economic losses, and environmental burdens. Accurate prediction of sand erosion in these pipelines, especially near elbow sections, is crucial to reduce pipeline failure. In this study, the CFD-DPM method verified by experiment data is used for numerical simulation. The effects of particle size, shape, and fluid viscosity on elbow erosion have been discussed. The results show that the maximum erosion rate decreases exponentially with the increase in fluid viscosity. It shows a decrease first and then increases with the increase in particle diameter, and an opposite trend with the increase in particle shape factor. More importantly, the correlation between the maximum erosion position of the elbow and the Stokes number has been derived. Our work is expected to provide theoretical guide for anti-erosion design strategy for submarine pipelines.

海上油气开采和运输过程中管道沙蚀会导致严重的设备故障、巨大的经济损失和环境负担。准确预测这些管道中的沙蚀情况，尤其是弯头部分附近的沙蚀情况，对于减少管道故障至关重要。本研究采用经实验数据验证的CFD-DPM方法进行数值模拟。讨论了颗粒尺寸、形状和流体粘度对弯管侵蚀的影响。结果表明，最大侵蚀速率随着流体粘度的增加呈指数下降。随着粒径的增大，呈现先减小后增大的趋势，随着颗粒形状因子的增大，呈现相反的趋势。更重要的是，推导了弯头最大侵蚀位置与斯托克斯数之间的相关性。我们的工作有望为海底管道防侵蚀设计策略提供理论指导。