Sustainable Water Management Solutions for Large Cities (Proceedings of symposium S2 held during the Seventh IAHS Scientific Assembly at Foz do Iguaçu, Brazil, April 2005). IAHS Publ. 293, 2005, 147-154

1 Laboratory of Process Engineering and Environment, University Bordeaux 2,
351 cours de la Libération, F-33405 Talence, France

v.milisic@genproc.u-bordeaux.fr

2 CEREVE, Ecole Nationale des Ponts et Chausses, 6 et 8 av. B. Pascal, Cité Descartes,
Champs de Marne, F-77455 Marne la Vallée, France

3 Engineering School, Lebanese University, route de l’Aéroport, Beirut, Lebanon

Abstract The storage of urban wet-weather wastewater in basins seems to be a promising solution for pollution control of combined sewerage systems. Since the geometry and the operation of storage-settling tanks are often very complex, the usual design methods become unsuitable. Hence, there is a growing need for new tools to assist engineers in designing and/or managing such storage structures. A mathematical model for solids transport in sewers (SIMBADD, Simulation Mathématique des Bassins De Décantation) has been developed and implemented into CFX-4.3. This contribution concerns the simulation of the water surface boundary and the bottom sediment exchange. The bed boundary conditions are related to the turbulence features that are quite well described by computational fluid dynamics (CFD) models. This paper also presents an example of application to a real storage-settling basin under construction in Marseille (France).

Key words design; management; numerical modelling; storage-settling basins; urban wet-weather wastewater