Abstract
In this study, physical model tests are used to investigate the effects of a varying number of wave and current parameters, the gap ratios between the pipeline and seabed, the spacing ratios between the two pipelines and the diameter ratios on the hydrodynamic coefficients of the large, small pipeline and pipeline system (bundle) in a piggyback configuration under the combined action of waves and current. The results show that, compared with the pure wave field, the existence of the steady current will lead to a decrease in hydrodynamic coefficients. In addition, the results indicate clear differences between the hydrodynamic coefficients of the large pipeline, small pipeline and piggyback pipeline system. The experimental results on hydrodynamic coefficients can be used as an important basis for the safety design of a submarine piggyback pipeline.
Highlights
CD of the small pipeline is smaller than CD of the large one and the piggyback pipeline system, and the difference decreases with the increase in KC number
This paper presents the experimental results of the hydrodynamic coefficients of the submarine piggyback pipeline under the action of regular waves and current
CD of the small pipeline is smaller than that of the large one and the pipeline system, and the difference decreases with the increase in KC, C M of the small pipeline is about 70% of that of the large one or the pipeline system, and the lift coefficient difference between the large, small pipeline and pipeline system gradually decreases as KC increases
Summary
A plexiglass sheet was connected at each end of the pipelines in order to the ties highlighted in gray, and it had little effect on blocking the flow between connect with the force sensor, which was fixed on the vertical steel plate, forming an the two pipelines. A plexiglass sheet was connected at each end of the pipelines in order experimental device for measuring the forces acting on the piggyback pipeline system. To connect with the force sensor, which was fixed on the vertical steel plate, forming an experimental device for measuring the forces acting on the piggyback pipeline system. 6, and it had little effect on blocking the flow between to connect with the force sensor, which was fixed on the vertical steel plate, forming the two pipelines.device.
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