A three-dimensional study of flow characteristics over different forms of stepped–labyrinth spillways in the skimming flow regime
To improve the performance of stepped spillways, their combination with labyrinth spillways is an interesting topic. In this study, several labyrinth configurations of stepped spillways were presented. Validation of the numerical model was done using the results of the previous physical models. Afte...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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IWA Publishing
2023-08-01
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| Series: | Aqua |
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| Online Access: | http://aqua.iwaponline.com/content/72/8/1415 |
| _version_ | 1797689461247574016 |
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| author | Dana Ghaderi Hamzeh Ebrahimnezhadian Mahdi Mollazadeh |
| author_facet | Dana Ghaderi Hamzeh Ebrahimnezhadian Mahdi Mollazadeh |
| author_sort | Dana Ghaderi |
| collection | DOAJ |
| description | To improve the performance of stepped spillways, their combination with labyrinth spillways is an interesting topic. In this study, several labyrinth configurations of stepped spillways were presented. Validation of the numerical model was done using the results of the previous physical models. After that, three configurations including: conventional stepped, trapezoidal-labyrinth, and rectangular-labyrinth were modeled using the OpenFOAM model for the skimming flow regime. For simulation, the InterFOAM solver and RNG k–ε turbulence model were used. The results showed an increase of 34.7 and 21.1% in energy dissipation in the trapezoidal and rectangular stepped–labyrinth spillways compared to the conventional stepped type, for dc/h = 1.45 (the range of dc is between 8 and 14.5 cm). The flow velocity in the end step of the trapezoidal- and rectangular-labyrinth configuration is reduced by 50.5 and 31.1%, respectively. Furthermore, in the trapezoidal configuration, a 14.7% reduction in flow velocity has been achieved compared to the rectangular stepped–labyrinth configuration. The results showed that the minimum pressure on the vertical faces of the steps occurred in their upper half and the rectangular configuration has resulted in the highest amount of negative pressure. The turbulence kinetic energy, especially in trapezoidal configuration, has increased toward the downstream.
HIGHLIGHTS
The combination of stepped and labyrinth spillways is effective in improving the performance of spillways in terms of energy dissipation.;
The trapezoidal stepped–labyrinth combined spillway has the best performance among the combined spillways in terms of energy dissipation.;
The minimum pressure on the horizontal face of the steps occurred in the central axis and the maximum occurred near the outer edge of the steps.; |
| first_indexed | 2024-03-12T01:45:53Z |
| format | Article |
| id | doaj.art-e7af9496cd08484580e6da716141a99a |
| institution | Directory Open Access Journal |
| issn | 2709-8028 2709-8036 |
| language | English |
| last_indexed | 2024-03-12T01:45:53Z |
| publishDate | 2023-08-01 |
| publisher | IWA Publishing |
| record_format | Article |
| series | Aqua |
| spelling | doaj.art-e7af9496cd08484580e6da716141a99a2023-09-09T07:23:39ZengIWA PublishingAqua2709-80282709-80362023-08-017281415143010.2166/aqua.2023.030030A three-dimensional study of flow characteristics over different forms of stepped–labyrinth spillways in the skimming flow regimeDana Ghaderi0Hamzeh Ebrahimnezhadian1Mahdi Mollazadeh2 Water and Hydraulic Structures, Department of Civil Engineering, University of Birjand, Birjand, Iran Water and Hydraulic Structures, Urmia, Iran Department of Civil Engineering, University of Birjand, Birjand, Iran To improve the performance of stepped spillways, their combination with labyrinth spillways is an interesting topic. In this study, several labyrinth configurations of stepped spillways were presented. Validation of the numerical model was done using the results of the previous physical models. After that, three configurations including: conventional stepped, trapezoidal-labyrinth, and rectangular-labyrinth were modeled using the OpenFOAM model for the skimming flow regime. For simulation, the InterFOAM solver and RNG k–ε turbulence model were used. The results showed an increase of 34.7 and 21.1% in energy dissipation in the trapezoidal and rectangular stepped–labyrinth spillways compared to the conventional stepped type, for dc/h = 1.45 (the range of dc is between 8 and 14.5 cm). The flow velocity in the end step of the trapezoidal- and rectangular-labyrinth configuration is reduced by 50.5 and 31.1%, respectively. Furthermore, in the trapezoidal configuration, a 14.7% reduction in flow velocity has been achieved compared to the rectangular stepped–labyrinth configuration. The results showed that the minimum pressure on the vertical faces of the steps occurred in their upper half and the rectangular configuration has resulted in the highest amount of negative pressure. The turbulence kinetic energy, especially in trapezoidal configuration, has increased toward the downstream. HIGHLIGHTS The combination of stepped and labyrinth spillways is effective in improving the performance of spillways in terms of energy dissipation.; The trapezoidal stepped–labyrinth combined spillway has the best performance among the combined spillways in terms of energy dissipation.; The minimum pressure on the horizontal face of the steps occurred in the central axis and the maximum occurred near the outer edge of the steps.;http://aqua.iwaponline.com/content/72/8/1415computational fluid dynamicsenergy dissipationopenfoamstepped–labyrinth spillway |
| spellingShingle | Dana Ghaderi Hamzeh Ebrahimnezhadian Mahdi Mollazadeh A three-dimensional study of flow characteristics over different forms of stepped–labyrinth spillways in the skimming flow regime Aqua computational fluid dynamics energy dissipation openfoam stepped–labyrinth spillway |
| title | A three-dimensional study of flow characteristics over different forms of stepped–labyrinth spillways in the skimming flow regime |
| title_full | A three-dimensional study of flow characteristics over different forms of stepped–labyrinth spillways in the skimming flow regime |
| title_fullStr | A three-dimensional study of flow characteristics over different forms of stepped–labyrinth spillways in the skimming flow regime |
| title_full_unstemmed | A three-dimensional study of flow characteristics over different forms of stepped–labyrinth spillways in the skimming flow regime |
| title_short | A three-dimensional study of flow characteristics over different forms of stepped–labyrinth spillways in the skimming flow regime |
| title_sort | three dimensional study of flow characteristics over different forms of stepped labyrinth spillways in the skimming flow regime |
| topic | computational fluid dynamics energy dissipation openfoam stepped–labyrinth spillway |
| url | http://aqua.iwaponline.com/content/72/8/1415 |
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