References of "Dewals, Benjamin"
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See detailAnalyse expérimentale de l'influence des largeurs d'alvéoles sur la débitance des déversoirs en touches de piano
Machiels, Olivier ULiege; Erpicum, Sébastien ULiege; Archambeau, Pierre ULiege et al

in Houille Blanche (2010), (2), 22-28

Within the framework of updating the release and storage capacities of existing reservoirs, the use of piano keys weirs (PKW) can be an interesting alternative either to increase the discharge of a free ... [more ▼]

Within the framework of updating the release and storage capacities of existing reservoirs, the use of piano keys weirs (PKW) can be an interesting alternative either to increase the discharge of a free weir without changing the weir layout or the reservoir level, or increase the reservoir level before discharge while keeping the weir layout and the level of safety. In order to help to the understanding of the behavior of this new type of weirs and to characterize their hydraulic potential, the results of an experimental study with for objectives to study the influence of the relative width of the inlets and outlets on the hydrodynamic characteristics of the structure are presented. A process oriented analytical formulation for the evaluation of the discharge coefficient of the PKW tested on scale models is proposed. It is in satisfactory agreement with the experimental results and leads to an objective evaluation of the optimal ratio of the alveoli widths. [less ▲]

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See detailContribution to the study of piano Key Weir hydraulics
Erpicum, Sébastien ULiege; Machiels, Olivier ULiege; Dewals, Benjamin ULiege et al

in Proceedings of the 8th ICOLD European Club Symposium (2010)

Within the framework of updating the release and storage capacities of existing reservoirs, the use of piano key weirs (PKW) can be an interesting alternative either to increase the discharge of a free ... [more ▼]

Within the framework of updating the release and storage capacities of existing reservoirs, the use of piano key weirs (PKW) can be an interesting alternative either to increase the discharge of a free weir without changing the weir width on the dam crest nor the reservoir level, or to increase the threshold reservoir level before releasing water while keeping the weir width and the level of safety. Results of first experiments on scale models have shown the high efficiency of PKW in terms of discharge capacity. But, even if PKW projects start to be developed on real structures, lacks persist in the understanding of the flow behavior on this new type of weir, in the characterization of their hydraulic potential and in the availability of design guidelines. This paper presents the results of several research projects, based on both numerical and physical modeling, carried out on this topic at the Laboratory of Engineering Hydraulics of the University of Liege. The researches rely on physical experiments on scale models of idealized PKW elements or real structures, as well as on numerical modeling with specifically developed solvers. The paper presents an overview of these projects, emphasizing the most important results regarding PKW design and performance. [less ▲]

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See detailHybrid modelling of dike-break induced flows
Roger, Sebastian; Dewals, Benjamin ULiege; Erpicum, Sébastien ULiege et al

in Dittrich, Andreas; Koll, Katinka; Aberle, Jochen (Eds.) et al River Flow 2010 (2010)

In a hybrid approach experimental model data are combined with results from 3D and 2D numerical modelling. The latter was conducted by two different models solving the depth-averaged shallow water ... [more ▼]

In a hybrid approach experimental model data are combined with results from 3D and 2D numerical modelling. The latter was conducted by two different models solving the depth-averaged shallow water equations. 3D computations are based on the REYNOLDS-averaged NAVIER-STOKES equations (RANS) using a volume of fluid approach to capture the free water surface. Measurements were performed on a scale model which was especially designed to reproduce the specific conditions of dike breaks. In various simulations it turned out that 2D shallow water models are able to reproduce steadystate flow patterns of dike-break induced flows and that there is a low sensitivity of the solution concerning turbulence modelling, bed and wall roughness. Nevertheless, final flow splits and breach discharges are systematically underestimated. This discrepancy seems to result from inherent modelling assumptions such as zero-vertical velocity and hydrostatic pressure distribution. Therefore, the complementary use of 3D RANS and 2D depth-averaged modelling frameworks for detailed predictions of dike-break induced flows is discussed in the present paper, based on BOUSSINESQ and pressure coefficients, which represent effects of non-uniform velocity profiles and non-hydrostatic pressure distribution over water depth, respectively. Values of these coefficients are inferred from 3D numerical results for the final steady state. [less ▲]

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See detail1D numerical approach to model the flow over a piano key weir (PKW)
Erpicum, Sébastien ULiege; Machiels, Olivier ULiege; Archambeau, Pierre ULiege et al

in Proc. Int. Conf. SimHydro 2010: Hydraulic modeling and uncertainty (2010)

Piano Key Weir (PKW) is a new type of weir showing appealing hydraulic capacities, in particular for low heads. However, its complex geometry, with a large set of parameters, makes difficult the ... [more ▼]

Piano Key Weir (PKW) is a new type of weir showing appealing hydraulic capacities, in particular for low heads. However, its complex geometry, with a large set of parameters, makes difficult the understanding of the flow features and consequently the definition of an optimal design. In this paper, we investigate how a 1D numerical approach can predict the flow over a PKW and thus help in identifying the most relevant geometric parameters. After a detailed description of the numerical model, a comparison of the numerical results with experimental data is realized, showing promising results. [less ▲]

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See detailModelling Free-surface Flows and Highly Transient Mixed Flows: A 1D Three-phase Approach
Kerger, François ULiege; Archambeau, Pierre ULiege; Dewals, Benjamin ULiege et al

in Proc. 1st European IAHR Congress (2010)

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See detailAn Extended Shallow-water-like Model Applied to Flows in Environmental and Civil Engineering
Kerger, François ULiege; Dewals, Benjamin ULiege; Erpicum, Sébastien ULiege et al

in Hirsch, Gerhard; Kappel, Bernd (Eds.) Hydraulic Engineering: Structural Applications, Numerical Modeling and Environmental Impacts (2010)

Objective of this text is to rigorously develop a unified mathematical model to simulate a wide range of environmental flows. Particular emphasis is placed on flows relevant in civil and environmental ... [more ▼]

Objective of this text is to rigorously develop a unified mathematical model to simulate a wide range of environmental flows. Particular emphasis is placed on flows relevant in civil and environmental engineering. [less ▲]

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See detailExperimental investigation of the effect of flip bucket splitters on plunge pool geometry
Erpicum, Sébastien ULiege; Archambeau, Pierre ULiege; Dewals, Benjamin ULiege et al

in Wasserwirtschaft (2010), 4

Flip buckets are common hydraulic structures aiming at deflecting high velocity flows to a free jet trajectory. Systematic experimental tests have been performed to assess the influence on energy ... [more ▼]

Flip buckets are common hydraulic structures aiming at deflecting high velocity flows to a free jet trajectory. Systematic experimental tests have been performed to assess the influence on energy dissipation and the plunge pool geometry of varied repartitions of splitters along the flip bucket width. In particular, it is shown that some configurations can create more erosion than a continuous channel without flip bucket. [less ▲]

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See detailDetailed inundation modelling using high resolution DEMs
Erpicum, Sébastien ULiege; Dewals, Benjamin ULiege; Archambeau, Pierre ULiege et al

in Engineering Applications of Computational Fluid Mechanics (2010), 2(4), 196-208

With the availability of high resolution DEMs, relevant and detailed inundation maps may now be routinely computed provided that suited flow models are available. The full 2D flow model presented in this ... [more ▼]

With the availability of high resolution DEMs, relevant and detailed inundation maps may now be routinely computed provided that suited flow models are available. The full 2D flow model presented in this paper has been used to compute such maps on 800 km of the main rivers of the Walloon Region in Belgium. The use of grid spacing of 1 m, similar to the DEM resolution, enables to accurately predict the pattern of flood depth. This is confirmed by several application examples, which also demonstrate the ability of the model to reproduce depth measurements for a wide range of flood discharges without the need for recalibration of the roughness coefficient. The numerical model has been systematically validated by comparison with observations during recent real flood events. It shows a very good agreement with field data, in particular regarding free surface elevations and inundation extension. [less ▲]

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See detailADAPT - Towards an Integrated Decision Tool for Adaptation Measures - Case study: Floods
Giron, Eve; Coninx, Ingrid; Dewals, Benjamin ULiege et al

Report (2010)

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See detailA Multiphase Model for the Transport of Dispersed Phases in Environmental Flows: Theoretical Contribution
Kerger, François ULiege; Dewals, Benjamin ULiege; Archambeau, Pierre ULiege et al

in European Journal of Mechanical and Environmental Engineering (2010), 3

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See detailTransport of Dispersed Phase in Civil Engineering: Unification of the Mathematical Description
Kerger, François ULiege; Dewals, Benjamin ULiege; Archambeau, Pierre ULiege et al

in Janssen, Robert; Chanson, Hubert (Eds.) Hydraulic Structures: Useful Water Harvesting Systems or Relics? (2010)

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See detailContribution théorique et numérique a la modélisation des écoulements mixtes diphasiques hautement transitoires
Kerger, François ULiege; Archambeau, Pierre ULiege; Dewals, Benjamin ULiege et al

in Proc. Int. Conf. SimHydro 2010: Hydraulic modeling and uncertainty (2010)

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See detailReliable hydraulic numerical modeling with multiblock grids and linked models
Erpicum, Sébastien ULiege; Archambeau, Pierre ULiege; Dewals, Benjamin ULiege et al

in Proc. Int. Conf. SimHydro 2010: Hydraulic modeling and uncertainty (2010)

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See detailExperimental investigation of the effect of flip bucket splitters on plunge pool geometry
Erpicum, Sébastien ULiege; Archambeau, Pierre ULiege; Dewals, Benjamin ULiege et al

in RWTH - IWW (Ed.) Mitteilungen - 15. Deutsches Talsperrensymposium - Talsperren im Wandel (2010)

Flip buckets are common hydraulic structures aiming at deflecting high velocity flows to a free jet trajectory. Systematic experimental tests have been performed to assess the influence on energy ... [more ▼]

Flip buckets are common hydraulic structures aiming at deflecting high velocity flows to a free jet trajectory. Systematic experimental tests have been performed to assess the influence on energy dissipation and the plunge pool geometry of varied repartitions of splitters along the flip bucket width. In particular, it is shown that some configurations can create more erosion than a continuous channel without flip bucket. [less ▲]

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See detailExperimental study of the hydraulic behavior of piano key weirs
Machiels, Olivier ULiege; Erpicum, Sébastien ULiege; Archambeau, Pierre ULiege et al

in Proc. 17th Congress of the Asia and Pacific Division of the International Association of Hydro-Environment Engineering and Research (2010)

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See detailModelling Mixed Flows in Civil and Environmental Engineering: a 1D Three-phase Approach
Kerger, François ULiege; Archambeau, Pierre ULiege; Dewals, Benjamin ULiege et al

in Proc of 7th International Conference on Mutiphase Flow (2010)

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See detailTransport of dispersed phase in environmental flows: How to unify the mathematical description?
Kerger, François ULiege; Dewals, Benjamin ULiege; Archambeau, Pierre ULiege et al

in Proc. 3rd International Junior Researcher and Engineer Workshop on Hydraulic Structures (2010)

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