| With the continuous development of offshore oil and gas resources,the pipe string structure involved in various offshore platform engineering and mining process is increasing day by day.Especially,the pipeline used in drilling and production is usually slender structure,which is impacted by current and wave.Continuous nonlinear fluid-solid coupling will occur,which will eventually lead to failure and fatigue failure of marine risers.In this paper,under the multi-physical field coupling platform Workbench of commercial CAE software Ansys,the F luent is used as the flow field solver and the data is exchanged with the Ansys dynamic response module.The numerical simulation results are compared with the experimental results.The feasibility of the above coupling simulation scheme is verified,and on this basis,the three-dimensional numerical simulation of vertical tube two-way fluid-solid coupling with different top tension,different pipe end constraints,different internal flow velocity and density,and wave and current combination is completed.Deepen the understanding of the vibration characteristics of the opposite tube,In this paper,the effects of the vortex induced vibration characteristics and the dynamic response characteristics of the riser subjected to the combined wave and current under complex working conditions are discussed.The simulation results show that the top tension and the inner flow of petroleum medium have obvious influence on the vibration characteristics of the riser.When natural gas with low density is used as an internal flow,it has the same dynamic characteristics as the riser without inner flow,but still has its unique characteristics.Compared with shallow water,the second order Stockes wave under deep water makes the vibration of riser produce greater amplitude than that of shallow water under the combined effects of wave and current.More intense tra ce motion and more complex vibration freque ncy. |
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