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Numerical simulation of 3D flow at 90o straight-channel confluence with bed elevation discordance

Authorized Users Only
2012
Authors
Đorđević, Dejana
Contributors
Hinkelmann, Reinhard
Nasermoaddeli, Mohammad Hassan
Liong, Yui
Savić, Dragan
Fröhle, Peter
Daemrich, Karl-Friedrich
Conference object (Published version)
,
TuTech Innovation GmbH
Metadata
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Abstract
The paper aims at studying the effect of difference in bed elevations between the tributary and main canals (∆zT) on the flow in the confluence hydrodynamics zone. To do this, a 3D numerical model is used for flow simulation at 90 confluences with four different values of the ∆zT/h ratio (where h is the water depth in the main canal at the confluence). The values are in the range [0.0, 0.5]. The ∆zT /h = 0.00 case corresponds to the concordant beds confluence, and the value of 0.50 is the common value in field confluences. Special attention is paid to the flow deflection and recirculation zones. It is found that: 1) the vertical velocity component attains the same order of magnitude as the horizontal velocity with the increasing ∆zT , 2) the enhanced 3D flow close to the side-wall shifts the recirculation zone away from the wall to the boundary streamline, thus changing the recirculation zone orientation whose axis becomes inclined at an angle to the wall, 3) the size of the zone is re...duced and 4) the structure of the zone is completely destroyed close to the free surface, where the core of the w_max is located.

Keywords:
3D numerical model / river confluence / bed elevation discordance ratio / junction angle 90o / recirculation zone / flow deflection
Source:
Proceedings of 10th International Conference on Hydroinformatics, 2012
Publisher:
  • TuTech Verlag, TuTech Innovation GmbH
Funding / projects:
  • Upravljanje vodnim akumukacijama i njihova zaštita (RS-22011)
  • Rizici u primeni Okvirnih direktiva Evropske unije u Republici Srbiji (RS-22017)

ISBN: 978-3-941492-45-5

[ Google Scholar ]
Handle
https://hdl.handle.net/21.15107/rcub_grafar_2285
URI
https://grafar.grf.bg.ac.rs/handle/123456789/2285
Collections
  • Катедра за хидротехнику и водно-еколошко инжењерство
Institution/Community
GraFar
TY  - CONF
AU  - Đorđević, Dejana
PY  - 2012
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/2285
AB  - The paper aims at studying the effect of difference in bed elevations between the tributary and main canals (∆zT) on the flow in the confluence hydrodynamics zone. To do this, a 3D numerical model is used for flow simulation at 90 confluences with four different values of the ∆zT/h ratio (where h is the water depth in the main canal at the confluence). The values are in the range [0.0, 0.5]. The ∆zT /h = 0.00 case corresponds to the concordant beds confluence, and the value of 0.50 is the common value in field confluences. Special attention is paid to the flow deflection and recirculation zones. It is found that: 1) the vertical velocity component attains the same order of magnitude as the horizontal velocity with the increasing ∆zT , 2) the enhanced 3D flow close to the side-wall shifts the recirculation zone away from the wall to the boundary streamline, thus changing the recirculation zone orientation whose axis becomes inclined at an angle to the wall, 3) the size of the zone is reduced and 4) the structure of the zone is completely destroyed close to the free surface, where the core of the w_max is located.
PB  - TuTech Verlag, TuTech Innovation GmbH
C3  - Proceedings of 10th International Conference on Hydroinformatics
T1  - Numerical simulation of 3D flow at 90o straight-channel confluence with bed elevation discordance
UR  - https://hdl.handle.net/21.15107/rcub_grafar_2285
ER  - 
@conference{
author = "Đorđević, Dejana",
year = "2012",
abstract = "The paper aims at studying the effect of difference in bed elevations between the tributary and main canals (∆zT) on the flow in the confluence hydrodynamics zone. To do this, a 3D numerical model is used for flow simulation at 90 confluences with four different values of the ∆zT/h ratio (where h is the water depth in the main canal at the confluence). The values are in the range [0.0, 0.5]. The ∆zT /h = 0.00 case corresponds to the concordant beds confluence, and the value of 0.50 is the common value in field confluences. Special attention is paid to the flow deflection and recirculation zones. It is found that: 1) the vertical velocity component attains the same order of magnitude as the horizontal velocity with the increasing ∆zT , 2) the enhanced 3D flow close to the side-wall shifts the recirculation zone away from the wall to the boundary streamline, thus changing the recirculation zone orientation whose axis becomes inclined at an angle to the wall, 3) the size of the zone is reduced and 4) the structure of the zone is completely destroyed close to the free surface, where the core of the w_max is located.",
publisher = "TuTech Verlag, TuTech Innovation GmbH",
journal = "Proceedings of 10th International Conference on Hydroinformatics",
title = "Numerical simulation of 3D flow at 90o straight-channel confluence with bed elevation discordance",
url = "https://hdl.handle.net/21.15107/rcub_grafar_2285"
}
Đorđević, D.. (2012). Numerical simulation of 3D flow at 90o straight-channel confluence with bed elevation discordance. in Proceedings of 10th International Conference on Hydroinformatics
TuTech Verlag, TuTech Innovation GmbH..
https://hdl.handle.net/21.15107/rcub_grafar_2285
Đorđević D. Numerical simulation of 3D flow at 90o straight-channel confluence with bed elevation discordance. in Proceedings of 10th International Conference on Hydroinformatics. 2012;.
https://hdl.handle.net/21.15107/rcub_grafar_2285 .
Đorđević, Dejana, "Numerical simulation of 3D flow at 90o straight-channel confluence with bed elevation discordance" in Proceedings of 10th International Conference on Hydroinformatics (2012),
https://hdl.handle.net/21.15107/rcub_grafar_2285 .

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