Abstract
In this study, local scour around two identical pipelines in a tandem arrangement are investigated numerically. Two-dimensional Reynolds-averaged Navier-Stokes (RANS) equations are solved for simulating the flow around the pipelines and the conservation equation of the sediment mass is solved to predict the scour process. Simulations are conducted for the gap ratios between the two pipelines (G/D) of 0.5 to 4 with an interval of 0.5, where G is the gap between the two pipelines and D is the diameter of the pipelines. The focus of the study is to investigate the effects of the gap ratio on the scour depths and scour time history under both upstream and downstream pipelines. It is found that the scour under the upstream pipeline reaches equilibrium sooner than that under the downstream pipeline. At the early stage of the scour, the sediment that comes from under the upstream pipeline deposits between the two pipelines has significant effect on the scour process under the downstream pipeline. Because of this, the time history of the scour under the downstream pipeline is totally different from that of a single isolated pipeline.
| Original language | English |
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| Title of host publication | Scour and Erosion: Proceedings of the 7th International Conference on Scour and Erosion, The Univervity of Western Australia, Perth, Australia, 2-4 December 2014 |
| Publisher | CRC Press |
| Pages | 405-410 |
| Number of pages | 6 |
| ISBN (Print) | 9781138027329 |
| DOIs | |
| Publication status | Published - 2014 |
| Event | International Conference on Scour and Erosion - Duration: 2 Dec 2014 → … |
Conference
| Conference | International Conference on Scour and Erosion |
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| Period | 2/12/14 → … |