Abstract
Pipeline-induced vibration phenomena caused by waves and currents during the transportation of oil and natural gas pipelines.Multiphysics coupling calculation considering the influence of fluid flow characteristics in ocean tidal flow environment and mechanical properties of pipeline solid structure on vibration characteristics of S-type pipeline. The analysis of the velocity of the fluid domain and the distribution of the stress distribution of the pipeline, combined with the time history and amplitude of the monitoring point and axis of the pipeline, analyzes the flow-induced vibration response characteristics of the S-transport pipeline. The results show that under the cyclic flow of the two-way tidal basin, the velocity field on the deformation side of the pipeline is lower, the stress at the solid support end is higher than that in the riser region, and the time-displacement of the pipeline fluctuates periodically, and the displacement of the pipeline axis increases sharply in the riser pipe section. It exhibits a normal distribution with extreme values at the center of the pipe segment. The maximum single-pass amplitude in the Verticality basin is twice that of the Parallel basin and the maximum amplitude is about 1D.
Highlights
The pipelines that are put into operation in the sea area are subject to eddy vibrations caused by the turbulence of the two-way tidal stream, resulting in excessive fatigue, reduced life, small cracks and even damage [1,2]
We investigated the velocity field caused by the periodic motion of the fluid and the stress and displacement of the pipe wall of the pipeline and explored the periodic deformation and vibration characteristics of the pipeline
According to the speed nephogram display: When the S-type flow pipeline exists in the parallel basin, the fluid around the S-type transport pipeline is obviously surrounded by the fluid-solid coupling effect, the flow velocity in the two solid supports of the transport pipeline vicinity is significantly larger, and the deformation of the pipe portion causes a difference in the surrounding flow field due to the deformation flutter
Summary
The pipelines that are put into operation in the sea area are subject to eddy vibrations caused by the turbulence of the two-way tidal stream, resulting in excessive fatigue, reduced life, small cracks and even damage [1,2]. D. Jia [6] applied a similar method to predict the formation and development of the slug flow of underwater straight pipes, bent pipes and crossover pipes, and obtained the pressure distribution of the flow field and the stress distribution of the pipeline under the action of multiphase flow. Another noteworthy problem is that the fluid-solid coupling vibration problem of the transport pipeline is a typical infinite-dimensional continuous gyroscopic system dynamics model. Based on the rigid cylindrical vortex-induced vibration of elastic support, combined with the flow dynamics equation and the mechanical equation of pipeline solid structure, the fluidsolid coupling calculation was carried out to fluidize the pipeline vibration caused by the flow of the two-way tidal flow in the S-transport pipeline. According to the coupling calculation and analysis, we calculated the velocity field changes caused by fluid periodic motion in the parallel and verticality basins and the stress and displacement of the pipeline wall, and analyzed the periodic deformation and vibration characteristics of the pipeline
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