Numerical calculation of hydrodynamic characteristics of tidal currents for submarine excavation engineering in coastal area
In coastal areas with complicated flow movement, deposition and scour readily occur in submarine excavation projects. In this study, a small-scale model, with a high resolution in the vertical direction, was used to simulate the tidal current around a submarine excavation project. The finite volume...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2016-04-01
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| Series: | Water Science and Engineering |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S1674237016300175 |
| _version_ | 1819101338094534656 |
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| author | Jian-hua Li Liang-sheng Zhu Shan-ju Zhang |
| author_facet | Jian-hua Li Liang-sheng Zhu Shan-ju Zhang |
| author_sort | Jian-hua Li |
| collection | DOAJ |
| description | In coastal areas with complicated flow movement, deposition and scour readily occur in submarine excavation projects. In this study, a small-scale model, with a high resolution in the vertical direction, was used to simulate the tidal current around a submarine excavation project. The finite volume method was used to solve Navier-Stokes equations and the Reynolds stress transport equation, and the entire process of the tidal current was simulated with unstructured meshes, generated in the irregular shape area, and structured meshes, generated in other water areas. The meshes near the bottom and free surface were densified with a minimum layer thickness of 0.05 m. The volume of fluid method was used to track the free surface, the volume fraction of cells on the upstream boundary was obtained from the volume fraction of adjacent cells, and that on the downstream boundary was determined by the water level process. The numerical results agree with the observed data, and some conclusions can be drawn: after the foundation trench excavation, the flow velocity decreases quite a bit through the foundation trench, with reverse flow occurring on the lee slope in the foundation trench; the swirling flow impedes inflow, leading to the occurrence of dammed water above the foundation trench; the turbulent motion is stronger during ebbing than in other tidal stages, the range with the maximum value of turbulent viscosity, occurring on the south side of the foundation trench at maximum ebbing, is greater than those in other tidal stages in a tidal cycle, and the maximum value of Reynolds shear stress occurs on the south side of the foundation trench at maximum ebbing in a tidal cycle. The numerical calculation method shows a strong performance in simulation of the hydrodynamic characteristics of tidal currents in the foundation trench, providing a basis for submarine engineering construction in coastal areas. |
| first_indexed | 2024-12-22T01:17:05Z |
| format | Article |
| id | doaj.art-8c82ee226837407ab14ae2e7fa3803fc |
| institution | Directory Open Access Journal |
| issn | 1674-2370 |
| language | English |
| last_indexed | 2024-12-22T01:17:05Z |
| publishDate | 2016-04-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Water Science and Engineering |
| spelling | doaj.art-8c82ee226837407ab14ae2e7fa3803fc2022-12-21T18:43:50ZengElsevierWater Science and Engineering1674-23702016-04-019215516410.1016/j.wse.2016.06.005Numerical calculation of hydrodynamic characteristics of tidal currents for submarine excavation engineering in coastal areaJian-hua LiLiang-sheng ZhuShan-ju ZhangIn coastal areas with complicated flow movement, deposition and scour readily occur in submarine excavation projects. In this study, a small-scale model, with a high resolution in the vertical direction, was used to simulate the tidal current around a submarine excavation project. The finite volume method was used to solve Navier-Stokes equations and the Reynolds stress transport equation, and the entire process of the tidal current was simulated with unstructured meshes, generated in the irregular shape area, and structured meshes, generated in other water areas. The meshes near the bottom and free surface were densified with a minimum layer thickness of 0.05 m. The volume of fluid method was used to track the free surface, the volume fraction of cells on the upstream boundary was obtained from the volume fraction of adjacent cells, and that on the downstream boundary was determined by the water level process. The numerical results agree with the observed data, and some conclusions can be drawn: after the foundation trench excavation, the flow velocity decreases quite a bit through the foundation trench, with reverse flow occurring on the lee slope in the foundation trench; the swirling flow impedes inflow, leading to the occurrence of dammed water above the foundation trench; the turbulent motion is stronger during ebbing than in other tidal stages, the range with the maximum value of turbulent viscosity, occurring on the south side of the foundation trench at maximum ebbing, is greater than those in other tidal stages in a tidal cycle, and the maximum value of Reynolds shear stress occurs on the south side of the foundation trench at maximum ebbing in a tidal cycle. The numerical calculation method shows a strong performance in simulation of the hydrodynamic characteristics of tidal currents in the foundation trench, providing a basis for submarine engineering construction in coastal areas.http://www.sciencedirect.com/science/article/pii/S1674237016300175Small-scale modelTidal currentHydrodynamic characteristicCoastal areaSubmarine excavation engineeringReynolds stress model |
| spellingShingle | Jian-hua Li Liang-sheng Zhu Shan-ju Zhang Numerical calculation of hydrodynamic characteristics of tidal currents for submarine excavation engineering in coastal area Water Science and Engineering Small-scale model Tidal current Hydrodynamic characteristic Coastal area Submarine excavation engineering Reynolds stress model |
| title | Numerical calculation of hydrodynamic characteristics of tidal currents for submarine excavation engineering in coastal area |
| title_full | Numerical calculation of hydrodynamic characteristics of tidal currents for submarine excavation engineering in coastal area |
| title_fullStr | Numerical calculation of hydrodynamic characteristics of tidal currents for submarine excavation engineering in coastal area |
| title_full_unstemmed | Numerical calculation of hydrodynamic characteristics of tidal currents for submarine excavation engineering in coastal area |
| title_short | Numerical calculation of hydrodynamic characteristics of tidal currents for submarine excavation engineering in coastal area |
| title_sort | numerical calculation of hydrodynamic characteristics of tidal currents for submarine excavation engineering in coastal area |
| topic | Small-scale model Tidal current Hydrodynamic characteristic Coastal area Submarine excavation engineering Reynolds stress model |
| url | http://www.sciencedirect.com/science/article/pii/S1674237016300175 |
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