Free surface profile and inception point as characteristics of aerated flow over stepped spillway: Numerical study
Stepped spillway is hydraulic structure designed to dissipate the excess in kinetic energy at the downstream of dams and can reduce the size of stilling basin at the toe of the spillway or chute. The flow on a stepped spillway is characterised by the large aeration that can prevent or reduce the cav...
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| Format: | Article |
| Language: | English |
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Polish Academy of Sciences
2019-09-01
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| Series: | Journal of Water and Land Development |
| Subjects: | |
| Online Access: | http://www.degruyter.com/view/j/jwld.2019.42.issue-1/jwld-2019-0043/jwld-2019-0043.xml?format=INT |
| _version_ | 1797721179922890752 |
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| author | Bentalha Chakib Habi Mohammed |
| author_facet | Bentalha Chakib Habi Mohammed |
| author_sort | Bentalha Chakib |
| collection | DOAJ |
| description | Stepped spillway is hydraulic structure designed to dissipate the excess in kinetic energy at the downstream of dams and can reduce the size of stilling basin at the toe of the spillway or chute. The flow on a stepped spillway is characterised by the large aeration that can prevent or reduce the cavitation damage. The air entrainment starts where the boundary layer attains the free surface of flow; this point is called “point of inception”. Within this work the inception point is determined by using software Ansys Fluent where the volume of fluid (VOF) model is used as a tool to track the free surface thereby the turbulence closure is derived in the k − ε turbulence standard model. This research aims to find new formulas for describe the variation of water depth at step edge and the positions of the inception point, at the same time the contour map of velocity, turbulent kinetic energy and strain rate are presented. The found numerical results agree well with experimental results like the values of computed and measured water depth at the inception point and the numerical and experimental inception point locations. Also, the dimensionless water depth profile obtained by numerical method agrees well with that of measurement. This study confirmed that the Ansys Fluent is a robust software for simulating air entrainment and exploring more characteristics of flow over stepped spillways. |
| first_indexed | 2024-03-12T09:30:10Z |
| format | Article |
| id | doaj.art-1fccc02875404cecb17c3a91b8841f01 |
| institution | Directory Open Access Journal |
| issn | 2083-4535 |
| language | English |
| last_indexed | 2024-03-12T09:30:10Z |
| publishDate | 2019-09-01 |
| publisher | Polish Academy of Sciences |
| record_format | Article |
| series | Journal of Water and Land Development |
| spelling | doaj.art-1fccc02875404cecb17c3a91b8841f012023-09-02T13:54:54ZengPolish Academy of SciencesJournal of Water and Land Development2083-45352019-09-01421424810.2478/jwld-2019-0043jwld-2019-0043Free surface profile and inception point as characteristics of aerated flow over stepped spillway: Numerical studyBentalha Chakib0Habi Mohammed1Abou Bakr Belkaid University, Department of Hydraulic, Faculty of Technology, Tlemcen, 13000, BP 230, AlgeriaAbou Bakr Belkaid University, Department of Hydraulic, Faculty of Technology, Tlemcen, 13000, BP 230, AlgeriaStepped spillway is hydraulic structure designed to dissipate the excess in kinetic energy at the downstream of dams and can reduce the size of stilling basin at the toe of the spillway or chute. The flow on a stepped spillway is characterised by the large aeration that can prevent or reduce the cavitation damage. The air entrainment starts where the boundary layer attains the free surface of flow; this point is called “point of inception”. Within this work the inception point is determined by using software Ansys Fluent where the volume of fluid (VOF) model is used as a tool to track the free surface thereby the turbulence closure is derived in the k − ε turbulence standard model. This research aims to find new formulas for describe the variation of water depth at step edge and the positions of the inception point, at the same time the contour map of velocity, turbulent kinetic energy and strain rate are presented. The found numerical results agree well with experimental results like the values of computed and measured water depth at the inception point and the numerical and experimental inception point locations. Also, the dimensionless water depth profile obtained by numerical method agrees well with that of measurement. This study confirmed that the Ansys Fluent is a robust software for simulating air entrainment and exploring more characteristics of flow over stepped spillways.http://www.degruyter.com/view/j/jwld.2019.42.issue-1/jwld-2019-0043/jwld-2019-0043.xml?format=INTAnsys Fluentfree surfaceinception pointstandard k − ε modelstepped spillwayVOF model |
| spellingShingle | Bentalha Chakib Habi Mohammed Free surface profile and inception point as characteristics of aerated flow over stepped spillway: Numerical study Journal of Water and Land Development Ansys Fluent free surface inception point standard k − ε model stepped spillway VOF model |
| title | Free surface profile and inception point as characteristics of aerated flow over stepped spillway: Numerical study |
| title_full | Free surface profile and inception point as characteristics of aerated flow over stepped spillway: Numerical study |
| title_fullStr | Free surface profile and inception point as characteristics of aerated flow over stepped spillway: Numerical study |
| title_full_unstemmed | Free surface profile and inception point as characteristics of aerated flow over stepped spillway: Numerical study |
| title_short | Free surface profile and inception point as characteristics of aerated flow over stepped spillway: Numerical study |
| title_sort | free surface profile and inception point as characteristics of aerated flow over stepped spillway numerical study |
| topic | Ansys Fluent free surface inception point standard k − ε model stepped spillway VOF model |
| url | http://www.degruyter.com/view/j/jwld.2019.42.issue-1/jwld-2019-0043/jwld-2019-0043.xml?format=INT |
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