Numerical Investigations on Scour and Flow around Two Crossing Pipelines on a Sandy Seabed
When a pipeline is laid on the seabed, local scour often occurs below it due to sea currents. In practical engineering, there are some cases that two pipelines laid on the seabed need to cross with each other. The complex flow structures around two crossing pipelines make the scour characteristics d...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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MDPI AG
2022-12-01
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| Series: | Journal of Marine Science and Engineering |
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| Online Access: | https://www.mdpi.com/2077-1312/10/12/2019 |
| _version_ | 1827638256607428608 |
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| author | Fan Zhang Zhipeng Zang Ming Zhao Jinfeng Zhang Botao Xie Xing Zou |
| author_facet | Fan Zhang Zhipeng Zang Ming Zhao Jinfeng Zhang Botao Xie Xing Zou |
| author_sort | Fan Zhang |
| collection | DOAJ |
| description | When a pipeline is laid on the seabed, local scour often occurs below it due to sea currents. In practical engineering, there are some cases that two pipelines laid on the seabed need to cross with each other. The complex flow structures around two crossing pipelines make the scour characteristics different from that of an isolated single pipeline. In this study, scour below two crossing pipelines was simulated numerically using the CFD software Flow-3D. The study is focused on the effect of the intersecting angle on the equilibrium depth and time scale of scour below the crossing position. Five intersecting angles, i.e., α = 0°, 15°, 30°, 45° and 90°, are considered, where α = 0° and 90° represent two pipelines parallel and perpendicular to each other, respectively. The results show that the equilibrium depth and the time scale of scour below the two crossing pipelines are greater than those of an isolated single pipeline. The equilibrium depth and time scale of scour have the largest values at α = 0° and decrease with the increase of the intersecting angle. Finally, the flow structures around the crossing pipelines are presented to explain the scour process. |
| first_indexed | 2024-03-09T16:13:58Z |
| format | Article |
| id | doaj.art-8103584929444089923f6ec77fea235e |
| institution | Directory Open Access Journal |
| issn | 2077-1312 |
| language | English |
| last_indexed | 2024-03-09T16:13:58Z |
| publishDate | 2022-12-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Journal of Marine Science and Engineering |
| spelling | doaj.art-8103584929444089923f6ec77fea235e2023-11-24T15:58:17ZengMDPI AGJournal of Marine Science and Engineering2077-13122022-12-011012201910.3390/jmse10122019Numerical Investigations on Scour and Flow around Two Crossing Pipelines on a Sandy SeabedFan Zhang0Zhipeng Zang1Ming Zhao2Jinfeng Zhang3Botao Xie4Xing Zou5State Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin University, Tianjin 300350, ChinaState Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin University, Tianjin 300350, ChinaSchool of Engineering, Design and Built Environment, University of Western Sydney, Penrith 2751, AustraliaState Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin University, Tianjin 300350, ChinaCNOOC Research Institute Co., Ltd., Beijing 100028, ChinaCNOOC Research Institute Co., Ltd., Beijing 100028, ChinaWhen a pipeline is laid on the seabed, local scour often occurs below it due to sea currents. In practical engineering, there are some cases that two pipelines laid on the seabed need to cross with each other. The complex flow structures around two crossing pipelines make the scour characteristics different from that of an isolated single pipeline. In this study, scour below two crossing pipelines was simulated numerically using the CFD software Flow-3D. The study is focused on the effect of the intersecting angle on the equilibrium depth and time scale of scour below the crossing position. Five intersecting angles, i.e., α = 0°, 15°, 30°, 45° and 90°, are considered, where α = 0° and 90° represent two pipelines parallel and perpendicular to each other, respectively. The results show that the equilibrium depth and the time scale of scour below the two crossing pipelines are greater than those of an isolated single pipeline. The equilibrium depth and time scale of scour have the largest values at α = 0° and decrease with the increase of the intersecting angle. Finally, the flow structures around the crossing pipelines are presented to explain the scour process.https://www.mdpi.com/2077-1312/10/12/2019crossing pipelineslocal scourflow structureintersecting anglenumerical simulation |
| spellingShingle | Fan Zhang Zhipeng Zang Ming Zhao Jinfeng Zhang Botao Xie Xing Zou Numerical Investigations on Scour and Flow around Two Crossing Pipelines on a Sandy Seabed Journal of Marine Science and Engineering crossing pipelines local scour flow structure intersecting angle numerical simulation |
| title | Numerical Investigations on Scour and Flow around Two Crossing Pipelines on a Sandy Seabed |
| title_full | Numerical Investigations on Scour and Flow around Two Crossing Pipelines on a Sandy Seabed |
| title_fullStr | Numerical Investigations on Scour and Flow around Two Crossing Pipelines on a Sandy Seabed |
| title_full_unstemmed | Numerical Investigations on Scour and Flow around Two Crossing Pipelines on a Sandy Seabed |
| title_short | Numerical Investigations on Scour and Flow around Two Crossing Pipelines on a Sandy Seabed |
| title_sort | numerical investigations on scour and flow around two crossing pipelines on a sandy seabed |
| topic | crossing pipelines local scour flow structure intersecting angle numerical simulation |
| url | https://www.mdpi.com/2077-1312/10/12/2019 |
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