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CFD Modeling of Solid Separation in Three Combined Sewer Overflow Chambers
Authors:Matthieu Dufresne  José Vazquez  Abdelali Terfous  Abdellah Ghenaim  Jean-Bernard Poulet
Affiliation:1Ph.D. Candidate, Laboratoire du Génie de la Conception, Institut National des Sciences Appliquées de Strasbourg, 24 Blvd. de la Victoire, 67084 Strasbourg Cedex, France. E-mail: matthieu.dufresne@free.fr
2Lecturer, Systèmes Hydrauliques Urbains, Ecole Nationale du Génie de l’Eau et de l’Environnement de Strasbourg, 1 quai Koch, BP 61039, 67070 Strasbourg Cedex, France.
3Lecturer, Laboratoire du Génie de la Conception, Institut National des Sciences Appliquées de Strasbourg, 24 Boulevard de la Victoire, 67084 Strasbourg Cedex, France.
4Professor, Laboratoire du Génie de la Conception, Institut National des Sciences Appliquées de Strasbourg, 24 Boulevard de la Victoire, 67084 Strasbourg Cedex, France.
Abstract:The knowledge of solid behavior in combined sewer overflow (CSO) chambers is a great challenge for the protection of receiving watercourses. Moreover, great attention must be given to the occurrence of deposits on the bed of the chamber because they may lead to operation problems. In this paper, we investigate the capability of a particle tracking approach to determine the solid separation in CSO chambers. This is done by comparing simulations and experimental data collected in three small-scale models, as reported by Kehrwiller 1995. The trap, reflect, and bed shear stress (BSS) boundary conditions are compared. We propose to use the Shields relationship for evaluating the critical BSS. Finally, we propose a methodology for predicting the solid separation in CSO chambers using computational fluid dynamics.
Keywords:Combined sewers  Overflow  Computational fluid dynamics technique  Separation  Solids  Shear stress  
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