海底滑坡对置于海床表面管线作用力的CFD模拟

CFD numerical analysis of submarine landslides impact on laid-on-seafloor pipeline

海底管线是海洋工程中用于传输原油和天然气等的重要通道,通常放置在海床表面或处于悬跨状态。本文采用计算流体动力学CFD法模拟了不同冲击角度下海底滑坡对置于海床表面的海底管线的作用,得到了管线所受的轴向荷载和法向荷载与滑坡冲击角度之间的关系。同时分析了沿冲击方向管线截面形状与管线所受阻力之间的关系。对已有研究进行拓展延伸,丰富了不同工况下轴向阻力系数和法向阻力系数的计算成果,得出了海底滑坡对置于海床表面管线冲击力的计算公式。

Submarine pipelines, in state of suspended or laid on the seafloor, were important transmissible channels of crude oil and natural gas in marine engineering. For the laid-on-seafloor pipelines, in order to get the axial and normal drag force of the pipeline under different impact angles, the CFD method was used to simulate the action of submarine landslide affecting on the submarine pipeline. Further, it was analysed that the relationship between the cross section shape of the pipeline in the impact direction and the drag force of the pipeline. The research extended the predecessors＇ work, enriched the calculated results of the longitudinal and the normal drag coefficient, and oh-tained the formula for estimating the impact force of the debris flow on the seabed pipelines.