Self-similarity of spanwise rotational motions’ population trends in decelerating open-channel flow
Decelerating open-channel flow is a type of flow that gradually moves forward with decreasing velocity and increasing water depth. Although all flow parameters change along the streamwise direction, previous studies have revealed that these parameters' vertical distributions at different sectio...
| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2022-03-01
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| Series: | Theoretical and Applied Mechanics Letters |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2095034922000241 |
| _version_ | 1811287286446292992 |
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| author | Peng Zhang Yanchong Duan Qiang Zhong Danxun Li Shengfa Yang Jiang Hu Wenjie Li |
| author_facet | Peng Zhang Yanchong Duan Qiang Zhong Danxun Li Shengfa Yang Jiang Hu Wenjie Li |
| author_sort | Peng Zhang |
| collection | DOAJ |
| description | Decelerating open-channel flow is a type of flow that gradually moves forward with decreasing velocity and increasing water depth. Although all flow parameters change along the streamwise direction, previous studies have revealed that these parameters' vertical distributions at different sections can be universally described with a single profile when being nondimensionalised by appropriate scales. This study focuses on the population trends of spanwise rotational motions at various sections along the main flow direction by particle imaging velocimetry (PIV) measurement. The wall-normal population distributions of density, radius, swirling strength, and convection velocity of the prograde and retrograde motions show similar trends in uniform open-channel flows. The dimensionless representation is invariant along the main flow direction. This study's results indicate the self-similar characteristic of population trends of spanwise rotational motions prevails in decelerating open-channel flow. |
| first_indexed | 2024-04-13T03:16:15Z |
| format | Article |
| id | doaj.art-3c75d5847a4c4a5289d073a3dd346398 |
| institution | Directory Open Access Journal |
| issn | 2095-0349 |
| language | English |
| last_indexed | 2024-04-13T03:16:15Z |
| publishDate | 2022-03-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Theoretical and Applied Mechanics Letters |
| spelling | doaj.art-3c75d5847a4c4a5289d073a3dd3463982022-12-22T03:04:54ZengElsevierTheoretical and Applied Mechanics Letters2095-03492022-03-01123100344Self-similarity of spanwise rotational motions’ population trends in decelerating open-channel flowPeng Zhang0Yanchong Duan1Qiang Zhong2Danxun Li3Shengfa Yang4Jiang Hu5Wenjie Li6National Engineering Research Center for Inland Waterway Regulation, Chongqing Jiaotong University, Chongqing 400074, ChinaState Key Laboratory of Hydroscience and Engineering, Tsinghua University, Beijing 100084, ChinaCollege of Water Resources & Civil Engineering, China Agricultural University, Beijing 100083, China; Beijing Engineering Research Center of Safety and Energy Saving Technology for Water Supply Network System in China Agricultural University, Beijing 100083, China; Corresponding authors.State Key Laboratory of Hydroscience and Engineering, Tsinghua University, Beijing 100084, ChinaNational Engineering Research Center for Inland Waterway Regulation, Chongqing Jiaotong University, Chongqing 400074, ChinaKey Laboratory of Ministry of Education for Hydraulic and Water Transport Engineering, Chongqing Jiaotong University, Chongqing 400074, ChinaNational Engineering Research Center for Inland Waterway Regulation, Chongqing Jiaotong University, Chongqing 400074, ChinaDecelerating open-channel flow is a type of flow that gradually moves forward with decreasing velocity and increasing water depth. Although all flow parameters change along the streamwise direction, previous studies have revealed that these parameters' vertical distributions at different sections can be universally described with a single profile when being nondimensionalised by appropriate scales. This study focuses on the population trends of spanwise rotational motions at various sections along the main flow direction by particle imaging velocimetry (PIV) measurement. The wall-normal population distributions of density, radius, swirling strength, and convection velocity of the prograde and retrograde motions show similar trends in uniform open-channel flows. The dimensionless representation is invariant along the main flow direction. This study's results indicate the self-similar characteristic of population trends of spanwise rotational motions prevails in decelerating open-channel flow.http://www.sciencedirect.com/science/article/pii/S2095034922000241Self-similarityPopulation trendsSpanwise rotational motionsDecelerating open-channel flowEquilibrium flow |
| spellingShingle | Peng Zhang Yanchong Duan Qiang Zhong Danxun Li Shengfa Yang Jiang Hu Wenjie Li Self-similarity of spanwise rotational motions’ population trends in decelerating open-channel flow Theoretical and Applied Mechanics Letters Self-similarity Population trends Spanwise rotational motions Decelerating open-channel flow Equilibrium flow |
| title | Self-similarity of spanwise rotational motions’ population trends in decelerating open-channel flow |
| title_full | Self-similarity of spanwise rotational motions’ population trends in decelerating open-channel flow |
| title_fullStr | Self-similarity of spanwise rotational motions’ population trends in decelerating open-channel flow |
| title_full_unstemmed | Self-similarity of spanwise rotational motions’ population trends in decelerating open-channel flow |
| title_short | Self-similarity of spanwise rotational motions’ population trends in decelerating open-channel flow |
| title_sort | self similarity of spanwise rotational motions population trends in decelerating open channel flow |
| topic | Self-similarity Population trends Spanwise rotational motions Decelerating open-channel flow Equilibrium flow |
| url | http://www.sciencedirect.com/science/article/pii/S2095034922000241 |
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