Numerical study of submerged bending vegetation under unidirectional flow
Submerged vegetation commonly grows and plays a vital role in aquatic ecosystems, but it is also regarded as a barrier to the passing flow. Numerical simulations of flow through and over submerged vegetation were carried out to investigate the effect of vegetation density on flow field. Numerical si...
| Main Authors: | , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2024-03-01
|
| Series: | Water Science and Engineering |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S1674237023000613 |
| _version_ | 1797337076578910208 |
|---|---|
| author | Pei-pei Zhang Yi-qing Gong Ken Vui Chua Jie Dai Jing-qiao Mao |
| author_facet | Pei-pei Zhang Yi-qing Gong Ken Vui Chua Jie Dai Jing-qiao Mao |
| author_sort | Pei-pei Zhang |
| collection | DOAJ |
| description | Submerged vegetation commonly grows and plays a vital role in aquatic ecosystems, but it is also regarded as a barrier to the passing flow. Numerical simulations of flow through and over submerged vegetation were carried out to investigate the effect of vegetation density on flow field. Numerical simulations were computationally set up to replicate flume experiments, in which vegetation was mimicked with flexible plastic strips. The fluid–structure interaction between flow and flexible vegetation was solved by coupling the two modules of the COMSOL packages. Two cases with different vegetation densities were simulated, and the results were successfully validated against the experimental data. The contours of the simulated time-averaged streamwise velocity and Reynolds stress were extracted to highlight the differences in mean and turbulent flow statistics. The turbulence intensity was found to be more sensitive to vegetation density than the time-averaged velocity. The developing length increased with the spacing between plants. The snapshots of the bending vegetation under instantaneous velocity and vorticity revealed that flexible vegetation responded to the effects of eddies in the shear layer by swaying periodically. The first two rows of vegetation suffered stronger approaching flow and were prone to more streamlined postures. In addition, the origin of tip vortices was investigated via the distribution of vorticity. The results reveal the variation of flow properties with bending submerged vegetation and provide useful reference for optimization of restoration projects. |
| first_indexed | 2024-03-08T09:04:11Z |
| format | Article |
| id | doaj.art-21cd417f1a09471d955e69bc62c7f6c4 |
| institution | Directory Open Access Journal |
| issn | 1674-2370 |
| language | English |
| last_indexed | 2024-03-08T09:04:11Z |
| publishDate | 2024-03-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Water Science and Engineering |
| spelling | doaj.art-21cd417f1a09471d955e69bc62c7f6c42024-02-01T06:29:45ZengElsevierWater Science and Engineering1674-23702024-03-0117192100Numerical study of submerged bending vegetation under unidirectional flowPei-pei Zhang0Yi-qing Gong1Ken Vui Chua2Jie Dai3Jing-qiao Mao4College of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing 210098, ChinaCollege of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing 210098, China; Institute of Water Science and Technology, Hohai University, Nanjing 210098, China; Corresponding author.School of Engineering, Cardiff University, Cardiff CF24 3AA, UKCollege of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing 210098, ChinaCollege of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing 210098, ChinaSubmerged vegetation commonly grows and plays a vital role in aquatic ecosystems, but it is also regarded as a barrier to the passing flow. Numerical simulations of flow through and over submerged vegetation were carried out to investigate the effect of vegetation density on flow field. Numerical simulations were computationally set up to replicate flume experiments, in which vegetation was mimicked with flexible plastic strips. The fluid–structure interaction between flow and flexible vegetation was solved by coupling the two modules of the COMSOL packages. Two cases with different vegetation densities were simulated, and the results were successfully validated against the experimental data. The contours of the simulated time-averaged streamwise velocity and Reynolds stress were extracted to highlight the differences in mean and turbulent flow statistics. The turbulence intensity was found to be more sensitive to vegetation density than the time-averaged velocity. The developing length increased with the spacing between plants. The snapshots of the bending vegetation under instantaneous velocity and vorticity revealed that flexible vegetation responded to the effects of eddies in the shear layer by swaying periodically. The first two rows of vegetation suffered stronger approaching flow and were prone to more streamlined postures. In addition, the origin of tip vortices was investigated via the distribution of vorticity. The results reveal the variation of flow properties with bending submerged vegetation and provide useful reference for optimization of restoration projects.http://www.sciencedirect.com/science/article/pii/S1674237023000613Computational fluid dynamicsFluid–structure interactionTurbulenceFlexible and submerged vegetation |
| spellingShingle | Pei-pei Zhang Yi-qing Gong Ken Vui Chua Jie Dai Jing-qiao Mao Numerical study of submerged bending vegetation under unidirectional flow Water Science and Engineering Computational fluid dynamics Fluid–structure interaction Turbulence Flexible and submerged vegetation |
| title | Numerical study of submerged bending vegetation under unidirectional flow |
| title_full | Numerical study of submerged bending vegetation under unidirectional flow |
| title_fullStr | Numerical study of submerged bending vegetation under unidirectional flow |
| title_full_unstemmed | Numerical study of submerged bending vegetation under unidirectional flow |
| title_short | Numerical study of submerged bending vegetation under unidirectional flow |
| title_sort | numerical study of submerged bending vegetation under unidirectional flow |
| topic | Computational fluid dynamics Fluid–structure interaction Turbulence Flexible and submerged vegetation |
| url | http://www.sciencedirect.com/science/article/pii/S1674237023000613 |
| work_keys_str_mv | AT peipeizhang numericalstudyofsubmergedbendingvegetationunderunidirectionalflow AT yiqinggong numericalstudyofsubmergedbendingvegetationunderunidirectionalflow AT kenvuichua numericalstudyofsubmergedbendingvegetationunderunidirectionalflow AT jiedai numericalstudyofsubmergedbendingvegetationunderunidirectionalflow AT jingqiaomao numericalstudyofsubmergedbendingvegetationunderunidirectionalflow |