Influence of bottom and sand curtain on hydrodynamic performance of otter boards
Numerical simulation is an important method for calculating the hydrodynamic performance of otter boards used in sea floor trawling. Although such simulations have been explored in prior studies, the effects of the proximity of the otter boards to the seafloor and the plume of upward-drawn sediment...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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KeAi Communications Co., Ltd.
2023-11-01
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| Series: | Aquaculture and Fisheries |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2468550X2200082X |
| _version_ | 1797204290514714624 |
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| author | Haoran Li Weiguo Qian Wenhua Chu Qing Yun Chunqin Yin |
| author_facet | Haoran Li Weiguo Qian Wenhua Chu Qing Yun Chunqin Yin |
| author_sort | Haoran Li |
| collection | DOAJ |
| description | Numerical simulation is an important method for calculating the hydrodynamic performance of otter boards used in sea floor trawling. Although such simulations have been explored in prior studies, the effects of the proximity of the otter boards to the seafloor and the plume of upward-drawn sediment during bottom trawling have largely been ignored. In this study, we assessed these factors. The results show that within the angles of attack used during normal operations, the effect of the seafloor bottom boundary of the flow field on the hydrodynamic performance of an otter board is obvious. We found that when the ratio of the distance between the bottom of an otter board and the surface boundary of the flow field to the chord length of the board exceeds 0.4, the influence of the bottom boundary of the flow field on the hydrodynamic performance of the board is negligible. For values of less than 0.4, the seafloor bottom boundary has an increasingly obvious impact on the hydrodynamic performance as this ratio decreases. We also found that the turbid plume of ocean floor sediment raised during bottom trawling has an obvious effect on the lift and resistance coefficients of an otter board at high angles of attack. At low angles, this effect on the lift-to-drag ratio is reversed and less obvious. The simulation results show that the optimal lift-to-drag ratio decreases with an increase in the sediment concentration; however, beyond a certain threshold, an increasing concentration of sediments was not found to have an obvious impact on the lift-to-drag ratio. |
| first_indexed | 2024-04-09T17:21:04Z |
| format | Article |
| id | doaj.art-e30f346a4edf476dab724b65a0692f71 |
| institution | Directory Open Access Journal |
| issn | 2468-550X |
| language | English |
| last_indexed | 2024-04-24T08:32:53Z |
| publishDate | 2023-11-01 |
| publisher | KeAi Communications Co., Ltd. |
| record_format | Article |
| series | Aquaculture and Fisheries |
| spelling | doaj.art-e30f346a4edf476dab724b65a0692f712024-04-16T19:18:31ZengKeAi Communications Co., Ltd.Aquaculture and Fisheries2468-550X2023-11-0186634643Influence of bottom and sand curtain on hydrodynamic performance of otter boardsHaoran Li0Weiguo Qian1Wenhua Chu2Qing Yun3Chunqin Yin4College of Marine Sciences, Shanghai Ocean University, Shanghai, 201306, ChinaCollege of Fisheries, Zhejiang Ocean University, Zhoushan, 316022, ChinaCollege of Marine Sciences, Shanghai Ocean University, Shanghai, 201306, China; National Engineering Research Center for Oceanic Fisheries, Shanghai, 201306, China; Laboratory of Sustainable Exploitation of Oceanic Fisheries Resources, Ministry of Education, Shanghai, 201306, China; Corresponding author. College of Marine Sciences, Shanghai Ocean University, Shanghai, 201306, China.College of Marine Sciences, Shanghai Ocean University, Shanghai, 201306, ChinaCollege of Marine Sciences, Shanghai Ocean University, Shanghai, 201306, ChinaNumerical simulation is an important method for calculating the hydrodynamic performance of otter boards used in sea floor trawling. Although such simulations have been explored in prior studies, the effects of the proximity of the otter boards to the seafloor and the plume of upward-drawn sediment during bottom trawling have largely been ignored. In this study, we assessed these factors. The results show that within the angles of attack used during normal operations, the effect of the seafloor bottom boundary of the flow field on the hydrodynamic performance of an otter board is obvious. We found that when the ratio of the distance between the bottom of an otter board and the surface boundary of the flow field to the chord length of the board exceeds 0.4, the influence of the bottom boundary of the flow field on the hydrodynamic performance of the board is negligible. For values of less than 0.4, the seafloor bottom boundary has an increasingly obvious impact on the hydrodynamic performance as this ratio decreases. We also found that the turbid plume of ocean floor sediment raised during bottom trawling has an obvious effect on the lift and resistance coefficients of an otter board at high angles of attack. At low angles, this effect on the lift-to-drag ratio is reversed and less obvious. The simulation results show that the optimal lift-to-drag ratio decreases with an increase in the sediment concentration; however, beyond a certain threshold, an increasing concentration of sediments was not found to have an obvious impact on the lift-to-drag ratio.http://www.sciencedirect.com/science/article/pii/S2468550X2200082XOtter boardNumerical simulationHydrodynamic performanceSediment plume |
| spellingShingle | Haoran Li Weiguo Qian Wenhua Chu Qing Yun Chunqin Yin Influence of bottom and sand curtain on hydrodynamic performance of otter boards Aquaculture and Fisheries Otter board Numerical simulation Hydrodynamic performance Sediment plume |
| title | Influence of bottom and sand curtain on hydrodynamic performance of otter boards |
| title_full | Influence of bottom and sand curtain on hydrodynamic performance of otter boards |
| title_fullStr | Influence of bottom and sand curtain on hydrodynamic performance of otter boards |
| title_full_unstemmed | Influence of bottom and sand curtain on hydrodynamic performance of otter boards |
| title_short | Influence of bottom and sand curtain on hydrodynamic performance of otter boards |
| title_sort | influence of bottom and sand curtain on hydrodynamic performance of otter boards |
| topic | Otter board Numerical simulation Hydrodynamic performance Sediment plume |
| url | http://www.sciencedirect.com/science/article/pii/S2468550X2200082X |
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