Une nouvelle structure d'écoulement en bifurcation à surface libre

Abstract : Dividing flows have been widely studied. These special structures found in sewers are responsible for complex flows. The understanding of these complex flows is the basis to better manage pollutants transport and mixing in sewer systems. This paper describes two flow structures observed experimentally and numerically in the downstream lateral branch of a 90° open channel dividing flow. These structures are recirculation flows: a classical one (2D) and a helix-shaped one (3D). First, the numerical model has been validated, being confronted with experimental measurements of velocities and water depths for two reference cases. Then, a numerical campaign has been led in order to describe in detail these structures. For the two types of recirculation, the flow visualization, notably of the streamlines in 3D, shows quite different characteristics of exchange with the main flow. It should be the same for their influence on the operation in sewers.
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Adrien Momplot, Gislain Lipeme Kouyi, Emmanuel Mignot, Nicolas Rivière, Jean-Luc Bertrand-Krajewski. Une nouvelle structure d'écoulement en bifurcation à surface libre. La Houille Blanche - Revue internationale de l'eau, EDP Sciences, 2015, 5, pp.78-83. ⟨10.1051/lhb/20150058⟩. ⟨hal-01298355⟩



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