Article (Scientific journals)
2D numerical flow modeling in a macro-rough channel
Erpicum, Sébastien; Meile, Tobias; Dewals, Benjamin et al.
2009In International Journal for Numerical Methods in Fluids, 61 (11), p. 1227-1246
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Keywords :
Hydrodynamics; Shallow water; Turbulence models; Turbulent flow; Partial differential equations; finite volume method; Macro roughness
Abstract :
[en] A 2D numerical flow model, developed at the Research unit of Hydrology, Applied Hydrodynamics and Hydraulic Constructions at ULg, has been applied to flows in a macro-rough channel. The model solves the shallow water equations (SWE) with a two length scale, depth-integrated k-type approach for turbulence modeling. Data for the comparison have been provided by experiments conducted at the Laboratory of Hydraulic Constructions at EPFL. In the experiments with different non-prismatic channel configurations, namely large-scale cavities at the side walls, three different 2D flow characteristics could be observed in cavities. With the used numerical model features, especially regarding turbulence and friction modeling, a single set of bottom and side wall roughness could be found for a large range of discharges investigated in a prismatic channel. For the macro rough configurations, the numerical model gives an excellent agreement between experimental and numerical results regarding backwater curves and flow patterns if the side wall cavities have low aspect ratios. For configurations with high aspect ratios, the head loss generated by the preservation of important recirculation gyres in the cavities is slightly underestimated. The results of the computations reveal clearly that the separation of turbulence sources in the mathematical model is of great importance. Indeed, the turbulence related to 2D transverse shear effects and the 3D turbulence, generated by bed friction, can have very different amplitude. When separating these two effects in the numerical models, most of the flow features observed experimentally can be reproduced accurately.
Research center :
Aquapôle - ULiège
Disciplines :
Civil engineering
Author, co-author :
Erpicum, Sébastien  ;  Université de Liège - ULiège > Département Argenco : Secteur MS2F > Hydraulique génér., const. hydraul. et méc. des fluides
Meile, Tobias;  Ecole Polytechnique Fédérale de Lausanne - EPFL > ENAC - ICARE > Laboratoire de Constructions Hydrauliques - LCH
Dewals, Benjamin  ;  Université de Liège - ULiège > Département Argenco : Secteur MS2F > Hydrodynamique appl. et constructions hydrauliques (HACH)
Pirotton, Michel ;  Université de Liège - ULiège > Département Argenco : Secteur MS2F > Hydrodynamique appl. et constructions hydrauliques (HACH)
Schleiss, Anton .J;  Ecole Polytechnique Fédérale de Lausanne - EPFL > ENAC - ICARE > Laboratoire de Constructions Hydrauliques - LCH
Language :
English
Title :
2D numerical flow modeling in a macro-rough channel
Alternative titles :
[fr] Modélisation numérique 2D des écoulements dans un canal macro-rugueux
Publication date :
December 2009
Journal title :
International Journal for Numerical Methods in Fluids
ISSN :
0271-2091
eISSN :
1097-0363
Publisher :
John Wiley & Sons LTD, Chichester, United Kingdom
Volume :
61
Issue :
11
Pages :
1227-1246
Peer reviewed :
Peer Reviewed verified by ORBi
Funders :
Swiss Federal Office for the Environment (FOEN)
F.R.S.-FNRS - Fonds de la Recherche Scientifique [BE]
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since 23 April 2009

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