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On the transition between symmetric and asymmetric flow in rectangular shallow reservoirs - a case of maximum energy dissipation?
Westhoff, Martijn; Erpicum, Sébastien; Archambeau, Pierre et al.
20174th International Symposium of Shallow Flows
 

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Keywords :
shallow reservoirs; thermodynamic limit; laboratory experiments
Abstract :
[en] Shallow reservoirs are often used as sediment traps or storage basins, in which sedimentation depends on the flow pattern. Short rectangular reservoirs reveal a straight jet from inlet to outlet with identical recirculation zones on both sides. In longer reservoirs, the main jet reattaches to the side of the reservoir leading to small and large recirculation zones. Previous studies have found an empirical geometric relation describing the switch between these two flow patterns. In this study, we demonstrate, with a simple analytical model, that this switch coincides with a maximization of energy dissipation in the shear layer between the main jet and recirculation zones: Short reservoirs dissipate more energy when the flow pattern is symmetric, while longer reservoirs dissipate more energy with an asymmetric pattern. This approach enables the prediction of the flow patterns without detailed knowledge of small scale processes, potentially useful in the early phase of reservoir design.
Research center :
Aquapôle - ULiège
Disciplines :
Civil engineering
Author, co-author :
Westhoff, Martijn ;  Vrije Universiteit Amsterdam, Amsterdam, The Netherlands > Department of Earth Science
Erpicum, Sébastien  ;  Université de Liège > Scientifiques attachés au Doyen (Sc.appliquées)
Archambeau, Pierre  ;  Université de Liège > Département ArGEnCo > HECE (Hydraulics in Environnemental and Civil Engineering)
Pirotton, Michel ;  Université de Liège > Département ArGEnCo > HECE (Hydraulics in Environnemental and Civil Engineering)
Dewals, Benjamin  ;  Université de Liège > Département ArGEnCo > Hydraulics in Environmental and Civil Engineering
Language :
English
Title :
On the transition between symmetric and asymmetric flow in rectangular shallow reservoirs - a case of maximum energy dissipation?
Publication date :
28 June 2017
Number of pages :
4
Event name :
4th International Symposium of Shallow Flows
Event organizer :
Eindhoven University of Technology
Event place :
Eindhoven, Netherlands
Event date :
26-28 June 2017
Audience :
International
European Projects :
FP7 - 600405 - BEIPD - Be International Post-Doc - Euregio and Greater Region
Funders :
CE - Commission Européenne [BE]
Available on ORBi :
since 31 January 2017

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