Abstract: 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.

Key words: submarine pipeline, flow field analysis, flow around cylinder, gap ratio, bed shear stress