基于Fluent的海底管线附近流场分析

针对单向海流作用下海底管道附近的流场问题，通过一定的假设，将问题简化为定床条件下的二维圆柱绕流问题. 采用不可压缩的N S方程和标准k ε湍流模型，模拟了置于床面的管道附近流场，结果与实验一致；同时，很好地模拟了悬空管道后方涡旋的生成、发展和脱落过程. 在此基础上，计算了不同流速和间隙比等条件下的多种工况，指出了管道附近的易冲刷区域，并进一步分析了绕流流态变化、床面切应力和管道上下游床面压差的分布特点，为防止管道附近床面的冲刷提供科学依据.

Analysis of Flow around Submarine Pipeline Based on Fluent

In certain assumptions,the analysis of flow around submarine pipeline in uni-flow was simplified to two-dimensional flow around cylinder on fixed bed.Incompressible N-S formula and standard k-ε turbulence model were applied to simulate the flow around the pipe on seabed,and the results were consistent with the experimental results.The development(i.e.formation,expansion and shedding) of vortex on the lee-side of pipe was simulated for suspended pipe;furthermore,pipes on different conditions(i.e.different elevation and income flow velocities) were calculated,and the most possible scour area was found;flow development,bed shear stress,and pressure distribution characteristics on bed were calculated in order to provide scientific basis of preventing the local scour around subsea pipelines.