Flow characteristics and energy dissipation over stepped spillway with various step geometries: case study (steps with curve end sill)
Abstract Stepped weirs are used in a wide range of applications, designed to increase energy dissipation. In this study, laboratory experiments were conducted in a flume on six stepped weir models, with a downstream angle of θ = 26.6°. The physical models used were on a scale of 10:1, and tests of d...
| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
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SpringerOpen
2024-02-01
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| Series: | Applied Water Science |
| Subjects: | |
| Online Access: | https://doi.org/10.1007/s13201-024-02110-9 |
| _version_ | 1797266616675729408 |
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| author | Udai A. Jahad Ali Chabuk Riyadh Al-Ameri Hasan Sh. Majdi Ali Majdi Nadhir Al-Ansari Salwan Ali Abed |
| author_facet | Udai A. Jahad Ali Chabuk Riyadh Al-Ameri Hasan Sh. Majdi Ali Majdi Nadhir Al-Ansari Salwan Ali Abed |
| author_sort | Udai A. Jahad |
| collection | DOAJ |
| description | Abstract Stepped weirs are used in a wide range of applications, designed to increase energy dissipation. In this study, laboratory experiments were conducted in a flume on six stepped weir models, with a downstream angle of θ = 26.6°. The physical models used were on a scale of 10:1, and tests of discharges up to 0.055 m3/s were carried out. Several step geometries including traditional step, sill and curve geometries were used to study flow behavior and overall energy dissipation. The laboratory investigations were augmented by modelling numerically the within step flow and energy behavior using a 2-D CFD model, incorporating the k-ε model for turbulence closure. The results showed that energy dissipation was greatest for the curved steps by about 10.5%, where it was observed that the skimming flow regime was shifted to a higher discharge range. Numerical modelling results showed good agreement with the experimental results. An inspection of the modelled streamlines highlighted the increase in vortex intensity for the curve model, reflecting the strong circulation observed. The predicted stepwise energy dissipation showed the energy dissipation increase when the step number Ns increases. For the range of step height hs, tested, our results showed that energy dissipation increased with step height. The results from this study can be used to inform engineering design for steps with θ = 26.6° and provide estimates of the expected energy dissipation and residual energy. |
| first_indexed | 2024-03-07T14:47:23Z |
| format | Article |
| id | doaj.art-264d2192d1c14c7d8d0714f72e1b5c26 |
| institution | Directory Open Access Journal |
| issn | 2190-5487 2190-5495 |
| language | English |
| last_indexed | 2024-04-25T01:03:32Z |
| publishDate | 2024-02-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | Applied Water Science |
| spelling | doaj.art-264d2192d1c14c7d8d0714f72e1b5c262024-03-10T12:19:21ZengSpringerOpenApplied Water Science2190-54872190-54952024-02-0114311110.1007/s13201-024-02110-9Flow characteristics and energy dissipation over stepped spillway with various step geometries: case study (steps with curve end sill)Udai A. Jahad0Ali Chabuk1Riyadh Al-Ameri2Hasan Sh. Majdi3Ali Majdi4Nadhir Al-Ansari5Salwan Ali Abed6Department of Environment Engineering, College of Engineering, University of BabylonDepartment of Environment Engineering, College of Engineering, University of BabylonSchool of Engineering, Deakin UniversityAl-Mustaqbal University CollegeAl-Mustaqbal University CollegeDepartment of Civil Environmental and Natural Resources Engineering, Lulea University of TechnologyCollege of Science, Al-Qadisiyah UniversityAbstract Stepped weirs are used in a wide range of applications, designed to increase energy dissipation. In this study, laboratory experiments were conducted in a flume on six stepped weir models, with a downstream angle of θ = 26.6°. The physical models used were on a scale of 10:1, and tests of discharges up to 0.055 m3/s were carried out. Several step geometries including traditional step, sill and curve geometries were used to study flow behavior and overall energy dissipation. The laboratory investigations were augmented by modelling numerically the within step flow and energy behavior using a 2-D CFD model, incorporating the k-ε model for turbulence closure. The results showed that energy dissipation was greatest for the curved steps by about 10.5%, where it was observed that the skimming flow regime was shifted to a higher discharge range. Numerical modelling results showed good agreement with the experimental results. An inspection of the modelled streamlines highlighted the increase in vortex intensity for the curve model, reflecting the strong circulation observed. The predicted stepwise energy dissipation showed the energy dissipation increase when the step number Ns increases. For the range of step height hs, tested, our results showed that energy dissipation increased with step height. The results from this study can be used to inform engineering design for steps with θ = 26.6° and provide estimates of the expected energy dissipation and residual energy.https://doi.org/10.1007/s13201-024-02110-9Energy dissipationSteppedModified stepSpillwayFlow regime |
| spellingShingle | Udai A. Jahad Ali Chabuk Riyadh Al-Ameri Hasan Sh. Majdi Ali Majdi Nadhir Al-Ansari Salwan Ali Abed Flow characteristics and energy dissipation over stepped spillway with various step geometries: case study (steps with curve end sill) Applied Water Science Energy dissipation Stepped Modified step Spillway Flow regime |
| title | Flow characteristics and energy dissipation over stepped spillway with various step geometries: case study (steps with curve end sill) |
| title_full | Flow characteristics and energy dissipation over stepped spillway with various step geometries: case study (steps with curve end sill) |
| title_fullStr | Flow characteristics and energy dissipation over stepped spillway with various step geometries: case study (steps with curve end sill) |
| title_full_unstemmed | Flow characteristics and energy dissipation over stepped spillway with various step geometries: case study (steps with curve end sill) |
| title_short | Flow characteristics and energy dissipation over stepped spillway with various step geometries: case study (steps with curve end sill) |
| title_sort | flow characteristics and energy dissipation over stepped spillway with various step geometries case study steps with curve end sill |
| topic | Energy dissipation Stepped Modified step Spillway Flow regime |
| url | https://doi.org/10.1007/s13201-024-02110-9 |
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