Numerical investigation of flow characteristics over stepped spillways
Spillways are constructed to evacuate flood discharge safely so that a flood wave does not overtop the dam body. There are different types of spillways, with the ogee type being the conventional one. A stepped spillway is an example of a nonconventional spillway. The turbulent flow over a stepped sp...
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IWA Publishing
2021
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oai:doaj.org-article:6b0ced2c50414928b2bf77251944cc812021-11-06T07:13:02ZNumerical investigation of flow characteristics over stepped spillways1606-97491607-079810.2166/ws.2020.283https://doaj.org/article/6b0ced2c50414928b2bf77251944cc812021-05-01T00:00:00Zhttp://ws.iwaponline.com/content/21/3/1344https://doaj.org/toc/1606-9749https://doaj.org/toc/1607-0798Spillways are constructed to evacuate flood discharge safely so that a flood wave does not overtop the dam body. There are different types of spillways, with the ogee type being the conventional one. A stepped spillway is an example of a nonconventional spillway. The turbulent flow over a stepped spillway was studied numerically by using the Flow-3D package. Different fluid flow characteristics such as longitudinal flow velocity, temperature distribution, density and chemical concentration can be well simulated by Flow-3D. In this study, the influence of slope changes on flow characteristics such as air entrainment, velocity distribution and dynamic pressures distribution over a stepped spillway was modelled by Flow-3D. The results from the numerical model were compared with an experimental study done by others in the literature. Two models of a stepped spillway with different discharge for each model were simulated. The turbulent flow in the experimental model was simulated by the Renormalized Group (RNG) turbulence scheme in the numerical model. A good agreement was achieved between the numerical results and the observed ones, which are exhibited in terms of graphics and statistical tables. HIGHLIGHTS A numerical model was developed for stepped spillways.; The turbulent flow was simulated by the Renormalized Group (RNG) model.; Both numerical and experimental results showed that flow characteristics are greatly affected by abrupt slope change on the steps.;Aytaç GüvenAhmed Hussein MahmoodIWA Publishingarticlecfdnumerical modellingslope changestepped spillwayturbulent flowWater supply for domestic and industrial purposesTD201-500River, lake, and water-supply engineering (General)TC401-506ENWater Supply, Vol 21, Iss 3, Pp 1344-1355 (2021) |
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DOAJ |
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DOAJ |
| language |
EN |
| topic |
cfd numerical modelling slope change stepped spillway turbulent flow Water supply for domestic and industrial purposes TD201-500 River, lake, and water-supply engineering (General) TC401-506 |
| spellingShingle |
cfd numerical modelling slope change stepped spillway turbulent flow Water supply for domestic and industrial purposes TD201-500 River, lake, and water-supply engineering (General) TC401-506 Aytaç Güven Ahmed Hussein Mahmood Numerical investigation of flow characteristics over stepped spillways |
| description |
Spillways are constructed to evacuate flood discharge safely so that a flood wave does not overtop the dam body. There are different types of spillways, with the ogee type being the conventional one. A stepped spillway is an example of a nonconventional spillway. The turbulent flow over a stepped spillway was studied numerically by using the Flow-3D package. Different fluid flow characteristics such as longitudinal flow velocity, temperature distribution, density and chemical concentration can be well simulated by Flow-3D. In this study, the influence of slope changes on flow characteristics such as air entrainment, velocity distribution and dynamic pressures distribution over a stepped spillway was modelled by Flow-3D. The results from the numerical model were compared with an experimental study done by others in the literature. Two models of a stepped spillway with different discharge for each model were simulated. The turbulent flow in the experimental model was simulated by the Renormalized Group (RNG) turbulence scheme in the numerical model. A good agreement was achieved between the numerical results and the observed ones, which are exhibited in terms of graphics and statistical tables. HIGHLIGHTS
A numerical model was developed for stepped spillways.;
The turbulent flow was simulated by the Renormalized Group (RNG) model.;
Both numerical and experimental results showed that flow characteristics are greatly affected by abrupt slope change on the steps.; |
| format |
article |
| author |
Aytaç Güven Ahmed Hussein Mahmood |
| author_facet |
Aytaç Güven Ahmed Hussein Mahmood |
| author_sort |
Aytaç Güven |
| title |
Numerical investigation of flow characteristics over stepped spillways |
| title_short |
Numerical investigation of flow characteristics over stepped spillways |
| title_full |
Numerical investigation of flow characteristics over stepped spillways |
| title_fullStr |
Numerical investigation of flow characteristics over stepped spillways |
| title_full_unstemmed |
Numerical investigation of flow characteristics over stepped spillways |
| title_sort |
numerical investigation of flow characteristics over stepped spillways |
| publisher |
IWA Publishing |
| publishDate |
2021 |
| url |
https://doaj.org/article/6b0ced2c50414928b2bf77251944cc81 |
| work_keys_str_mv |
AT aytacguven numericalinvestigationofflowcharacteristicsoversteppedspillways AT ahmedhusseinmahmood numericalinvestigationofflowcharacteristicsoversteppedspillways |
| _version_ |
1718443799506583552 |