Article (Scientific journals)
Unsteady Shallow Meandering Flows in Rectangular Reservoirs: A Modal Analysis of URANS Modelling
Valero, Daniel; Bung, Daniel B.; Erpicum, Sébastien et al.
2022In Journal of Hydro-Environment Research
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Keywords :
Management, Monitoring, Policy and Law; Water Science and Technology; Environmental Chemistry; Civil and Structural Engineering; Environmental Engineering
Abstract :
[en] Shallow flows are common in natural and human-made environments. Even for simple rectangular shallow reservoirs, recent laboratory experiments show that the developing flow fields are particularly complex, involving large-scale turbulent structures. For specific combinations of reservoir size and hydraulic conditions, a meandering jet can be observed. While some aspects of this pseudo-2D flow pattern can be reproduced using a 2D numerical model, new 3D simulations, based on the unsteady Reynolds-Averaged Navier-Stokes equations, show consistent advantages as presented herein. A Proper Orthogonal Decomposition was used to characterize the four most energetic modes of the meandering jet at the free surface level, allowing comparison against experimental data and 2D (depth-averaged) numerical results. Three different isotropic eddy viscosity models (RNG k-ε, k-ε, k-ω) were tested. The 3D models accurately predicted the frequency of the modes, whereas the amplitudes of the modes and associated energy were damped for the friction-dominant cases and augmented for non-frictional ones. The performance of the three turbulence models remained essentially similar, with slightly better predictions by RNG k-ε model in the case with the highest Reynolds number. Finally, the Q-criterion was used to identify vortices and study their dynamics, assisting on the identification of the differences between: i) the three-dimensional phenomenon (here reproduced), ii) its two-dimensional footprint in the free surface (experimental observations) and iii) the depth-averaged case (represented by 2D models).
Research center :
UEE - Urban and Environmental Engineering - ULiège
Disciplines :
Civil engineering
Author, co-author :
Valero, Daniel ;  Karlsruhe Institute of Technology (KIT) > Institute for Water and River Basin Development (IWG)
Bung, Daniel B.;  Aachen University of Applied Sciences (FH Aachen)
Erpicum, Sébastien  ;  Université de Liège - ULiège > Urban and Environmental Engineering
Peltier, Yann ;  Université de Liège - ULiège > Département ArGEnCo > Hydraulics in Environmental and Civil Engineering
Dewals, Benjamin  ;  Université de Liège - ULiège > Urban and Environmental Engineering
Language :
English
Title :
Unsteady Shallow Meandering Flows in Rectangular Reservoirs: A Modal Analysis of URANS Modelling
Publication date :
March 2022
Journal title :
Journal of Hydro-Environment Research
ISSN :
1570-6443
eISSN :
1876-4444
Publisher :
Elsevier BV
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 31 March 2022

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