References of "Erpicum, Sébastien"
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See detailA 2D finite volume multiblock flow solver applied to flood extension forecasting
Erpicum, Sébastien ULg; Archambeau, Pierre ULg; Detrembleur, Sylvain ULg et al

in García-Navarro, Pilar; Playán, Enrique (Eds.) Numerical modelling of hydrodynamics for water ressources (2008)

ABSTRACT: this paper describes a quasi-3D free surface flow solver,developed for almost ten years at the University of Liege, and its application to flood extension forecasting. Based on the classical SWE ... [more ▼]

ABSTRACT: this paper describes a quasi-3D free surface flow solver,developed for almost ten years at the University of Liege, and its application to flood extension forecasting. Based on the classical SWE, the finite volume numerical model deals with real topography and wetting-drying cells while exactly conserving the water volume. Multiblock options allow local refine-ment of the structured calculation grid and automatic mesh refinement enhances greatly compu-tation time. An additional depth-averaged k-ε type turbulence model increases the potentialities of the solver to represent real complex flows. Following a Regional Government decision, this solver has been officially chosen in 2003 to be used to compute inundation maps on 800 km of the main rivers of the Walloon Region in Belgium with a spatial resolution of 5 x 5 to 2 x 2 me-ters and using high resolution Digital Elevation Models. Results are presented in this paper. [less ▲]

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See detailAn explicit projection method for solving incompressible Navier-Stokes equations
Detrembleur, Sylvain ULg; Dewals, Benjamin ULg; Archambeau, Pierre ULg et al

in Pagliara, Stephano (Ed.) Hydraulic Structures (2008)

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See detailHydraulique Urbaine
Pirotton, Michel ULg; Archambeau, Pierre ULg; Erpicum, Sébastien ULg et al

Learning material (2008)

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See detailModelling of sewer systems as a component of a global hydrological model
Khuat Duy, Bruno ULg; Archambeau, Pierre ULg; Dewals, Benjamin ULg et al

in Proceedings of the 4th International Conference on Advanced Computational Methods in Engineering (2008)

Hydrology often takes an important place in the domain of hydraulic structures management, and is a key component of many hydraulic studies. Modelling the main hydrological processes requires a particular ... [more ▼]

Hydrology often takes an important place in the domain of hydraulic structures management, and is a key component of many hydraulic studies. Modelling the main hydrological processes requires a particular attention in order to deal with problems in an optimal way. Instrumented basins studies has pointed out the considerable impact of the sewer system on the hydrological outputs dynamics on small basins, even poorly urbanized. The current models often take into account the distributed impervious areas by adapting the corresponding surfaces runoff or infiltration coefficients. This approach, which is suited to produce correct runoff volumes, is however unable to represent the real flow outputs dynamics in which important variations can occur with a hourly time step. Modelling this flow component is essential to catch the rapidly-varying flow inputs generated by the runoff on drained impervious areas. An efficient modelling method has therefore been developed to include the sewer system in a global hydrological model (WOLF), using accurate landuse data in vector format and available data on the sewage system. These developments have been successfully tested on the Berwinne basin, Belgium. [less ▲]

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See detailAutomatic geometrical optimization by way of numerical flow models
Erpicum, Sébastien ULg; Archambeau, Pierre ULg; Dewals, Benjamin ULg et al

in Proceedings of the 3rd IAHR-International Symposium on Hydraulic Structures (2008)

The potentialities in numerical flow modeling available today allow performing more and more representative and accurate computations of an increasing part of hydraulic engineering practical problems. In ... [more ▼]

The potentialities in numerical flow modeling available today allow performing more and more representative and accurate computations of an increasing part of hydraulic engineering practical problems. In some cases, numerical simulation can be used as an alternative, or at least an efficient pre-design tool, to more classic physical modeling. In this framework, the paper presents the application of integrated numerical tools to the automatic optimization of the geometry of a guide-wall at the entrance of a channel. The simulations have been performed by using a Genetic Algorithm based optimization tool coupled to a 2D free surface flow model. This finite volume multibock flow solver, WOLF2D, solves the conservative form of the classical shallow water equations together with a depth-integrated k-ε type turbulence model. The calculations have been performed on a cluster of 12 processors to reach a satisfactory solution in less than 2.5 days (96 solutions tested). On the basis of the numerical results and of the value of the suitability indicators, the optimal solution is objectively better than the other tested geometries. This confirms the efficiency of the automatic optimization procedure. [less ▲]

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See detailDetailed flood extension forecasting in the Walloon region with a 2D finite volume multiblock free surface flow solver
Erpicum, Sébastien ULg; Archambeau, Pierre ULg; Detrembleur, Sylvain ULg et al

in Proceedings of the 4th International Conference on Advanced Computational Methods in Engineering (2008)

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See detailHandling very different time scales in numerical modelling of sediment transport and morphodynamics
Dewals, Benjamin ULg; Archambeau, Pierre ULg; Erpicum, Sébastien ULg et al

in Proceedings of the 4th International Conference on Advanced Computational Methods in Engineering (2008)

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See detailA stable numerical scheme for shallow flow modelling taking into account bottom curvature
Dewals, Benjamin ULg; Erpicum, Sébastien ULg; Pirotton, Michel ULg

in Proceedings of the 4th International Conference on Advanced Computational Methods in Engineering (2008)

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See detailFlow in shallow rectangular basins: experimental study and 2D numerical simulations
Kantoush, Sameh A.; Dewals, Benjamin ULg; Erpicum, Sébastien ULg et al

in Proc. 8th International Conference on Hydro-Science and Engineering (ICHE) (2008)

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See detailAn experimental and numerical analysis of effects induced by moving bodies in free surface water
Kerger, François ULg; Detrembleur, Sylvain ULg; Archambeau, Pierre ULg et al

in Pagliara Stefano (Ed.) Hydraulic Structures (2008)

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See detailSensitivity analysis of the peak outflow induced by the breaching of embankment dams
Dewals, Benjamin ULg; Archambeau, Pierre ULg; Erpicum, Sébastien ULg et al

in Rutschmann, Peter (Ed.) Berichte des Lehrstuhls und der Versuchanstalt für Wasserbau und Wasserwirtschaft (2007)

Accurately predicting the flow induced by the collapse of embankment dams remains challenging, as a consequence of the level of uncertainty affecting the prediction of breach width and formation time ... [more ▼]

Accurately predicting the flow induced by the collapse of embankment dams remains challenging, as a consequence of the level of uncertainty affecting the prediction of breach width and formation time. Moreover, very few systematic analyses are available today concerning the sensitivity of the flow with respect to those uncertainties. The present theoretical analysis quantifies the influence of variations in the breach parameters on the peak outflow. [less ▲]

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See detailAnalysis and application of two complementary numerical models for predicting flood waves generated by failures or dysfunctions occuring on a complex of dams
Dewals, Benjamin ULg; Erpicum, Sébastien ULg; Archambeau, Pierre ULg et al

in Proceedings of the 32nd IAHR Biennial Congress - Harmonizing the demands from art and nature (2007)

A complete risk analysis related to a complex of dams may involve the assessment of a large number of different scenarios of failures and dysfunctions. However, a high computation time would be needed to ... [more ▼]

A complete risk analysis related to a complex of dams may involve the assessment of a large number of different scenarios of failures and dysfunctions. However, a high computation time would be needed to perform a two-dimensional analysis of the flows generated by all possible scenarios. For this reason, the present paper expounds two complementary flow models, developed to be exploited within a rational methodology for analysing the flows induced by various incidents on a complex of dams and reservoirs. The first model is the two-dimensional flow solver WOLF 2D, while the second one is a simplified lumped model, requiring very low computation time. An original analytical study is presented to demonstrate the conditions of applicability of the lumped model. This study leads to the practical conclusion that the evaluation of two non-dimensional parameters enables to assess a priori the validity of the simplified approach for any specific application. The paper also describes the combined application of both models to a practical case study involving a complex of five dams. In a first step the lumped model has been validated by comparisons with the results provided by the two-dimensional model WOLF 2D. Secondly the simplified model has been successfully applied, at a very low CPU cost, to simulate flows induced by various dysfunctions and to conduct sensitivity analysis. In conclusion, based on both theoretical developments and numerical studies, the paper provides new advances of practical relevance for dam break risk analysis. [less ▲]

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See detailHétérogénéité des échelles spatio-temporelles d’écoulements hydrosédimentaires et modélisation numérique
Dewals, Benjamin ULg; Erpicum, Sébastien ULg; Archambeau, Pierre ULg et al

in Articles du colloque Transports solides et gestion des sédiments en milieux naturels et urbains (2007)

The numerical models for flow and sediment transport must be able to handle properly the wide range of space- and time-scales relevant for the processes to be modelled. For this purpose different levels ... [more ▼]

The numerical models for flow and sediment transport must be able to handle properly the wide range of space- and time-scales relevant for the processes to be modelled. For this purpose different levels of numerical coupling between the flow solver and the sediment transport model must be considered. Besides a short review of the mathematical background, the present paper describes the modelling system WOLF, developed at the University of Liege and enabling to handle the vast majority of time scales characterizing practical applications of flows with sediment transport, by means of specific numerical techniques. The applicability of the modelling system is demonstrated based on several examples of simulations related to the design and the operation of a large hydroelectric project in India. [less ▲]

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