Laboratoire de Mécanique des Fluides et d'Acoustique - UMR 5509

LMFA - UMR 5509
Laboratoire de Mécanique des Fluides et d’Acoustique
Lyon
France


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Accueil > Actualités > Thèses - Habilitations à diriger des recherches

Soutenance de thèse ECL

Ming Xiao

Vendredi 7 juillet 2017 - 9h30 - Amphi 1 bis - ECL

Ming Xiao

Experimental and Numerical Study of Open Channel Intersections


Jury
P. Finaud-Guyot, Maître de Conférences, HDR, Ecole Nationale du Génie de l’Eau et de l’Environnement de Strasbourg, examinateur
P. Larroudé, Maître de Conférences, HDR, LEGI, Université de Grenoble, rapporteur
R.J. Perkins, Professeur, LMFA, Ecole Centrale de Lyon, co-directeur de thèse
N. Rivière, Professeur, LMFA, INSA Lyon, co-directeur de thèse
S. Tait, Professeur, Dept. of Civil and Structural Engineering, University of Sheffield, rapporteur
I. Trébinjac, Professeur, LMFA, Ecole Centrale de Lyon


Abstact
This thesis presents a combination of analytical, experimental and numerical approaches on the characteristics of different types of flows in an open channel intersection. As part of an ongoing research programme in the LMFA on subcritical, transcritical and supercritical flows in channel intersections, the main objective of the work presented in this thesis is to extend laboratory investigations and improvement analytical and numerical model.

We firstly considers the problem of subcritical flow in a four channel intersection (2 inflow, 2 outflow). A head loss coefficient for the flow in the intersection has been determined, as a function of the ratio of the two inflows, and this can be used to replace the more complicated empirical correlation which was previously employed. Another important art of the thesis investigates the flow produced in a T-junction, when the incoming flow is supercritical. Two theoretical models have been proposed to explain the development of the flow leaving the junction through the side channel – one based on an analogy with the dam break flow, and the other on an analogy with a Prandtl-Meyer expansion fan – and the experimental data show that both provide a reasonable approximation for the flow. For further investigations, numerical simulations are then carried out for free surface flows in a channel intersection, by using the Smoothed Particle Hydrodynamics (SPH) approach. The different simulations showed that the code is capable of reproducing both supercritical and subcritical flows in these configurations.



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