ORBi: Roger Sebastian - Hybrid modelling of dike-break induced flows

Reference : Hybrid modelling of dike-break induced flows


	Document type :	Scientific congresses and symposiums : Paper published in a book
	Discipline(s) :	Engineering, computing & technology : Civil engineering
	To cite this reference:	http://hdl.handle.net/2268/40654

Title :	Hybrid modelling of dike-break induced flows
Language :	English
Author, co-author :	Roger, Sebastian [> >]
	Dewals, Benjamin [Université de Liège - ULg > Département Argenco : Secteur MS2F > Hydrodynamique appl. et constructions hydrauliques (HACH) >]
	Erpicum, Sébastien [Université de Liège - ULg > Département Argenco : Secteur MS2F > Hydraulique génér., const. hydraul. et méc. des fluides >]
	Schwanenberg, Dirk [> >]
	Archambeau, Pierre [Université de Liège - ULg > Département Argenco : Secteur MS2F > Hydrodynamique appl. et constructions hydrauliques (HACH) >]
	Köngeter, Jürgen [> >]
	Pirotton, Michel [Université de Liège - ULg > Département Argenco : Secteur MS2F > Hydrodynamique appl. et constructions hydrauliques (HACH) >]
	Schüttrumpf, Holger [> >]
Publication date :	2010
Main document title :	River Flow 2010
Editor :	Dittrich, Andreas
	Koll, Katinka
	Aberle, Jochen
	Geisenhainer, Peter
Publisher :	BAW
Pages :	523-531
Peer reviewed :	Yes
Audience :	International
ISBN :	9783939230007
City :	Brunswick
Country :	Germany
Event name :	International Conference on fluvial Hydraulics
Event date :	8-10 septembre 2010
Event place (city) :	Braunschweig
Event country :	Germany
Keywords :	[en] dike break flows ; dam break flow ; dam breaching
Abstract :	[en] 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.
Research units :	Aquapôle - AQUAPOLE
Funders :	Fonds de la Recherche Scientifique (Communauté française de Belgique) - F.R.S.-FNRS
Target :	Researchers ; Professionals ; Students
Permalink :	http://hdl.handle.net/2268/40654

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