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Développement d'une approche de type LES pour la simulation d'écoulements diphasiques avec interface. Application à l'atomisation primaire.

Abstract : Whereas Large Eddy Simulation (L.E.S.) of single-phase flows is already widely used in the CFD world, even for industrial applications, L.E.S. of two-phase interfacial flows, i.e. two-phase flows where an interface separates liquid and gas phases, still remains a challenging task. The main issue is the development of subgrid scale models well suited for two-phase interfacial flows. The aim of this work is to generate a detailed D.N.S. database of incompressible two-phase interfacial flows in order to clearly understand interactions between small turbulent scales and the interface separating the two phases. The different subgrid scale terms derive from an a priori analysis of this D.N.S. database. To do this, different numerical techniques are firstly compared to find which methods are well adapted to deal with turbulent configurations where large interfacial deformations occur. Then, the interface/turbulence interaction is studied in the configuration where the interface is widely deformed and where both phases are resolved by D.N.S. The interaction between an initially plane interface and a freely decaying homogeneous isotropic turbulence (H.I.T.) is studied. The densities and viscosities are the same for both phases in order to focus on the effect of the surface tension coefficient. A parametric study based on the Weber number is performed. Finally, an a priori study is carried out where the different subgrid scale terms derive from the filtering of the D.N.S. database.
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Submitted on : Friday, July 9, 2010 - 12:14:48 PM
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Pierre Trontin. Développement d'une approche de type LES pour la simulation d'écoulements diphasiques avec interface. Application à l'atomisation primaire.. Physique [physics]. Ecole nationale superieure de l'aeronautique et de l'espace, 2009. Français. ⟨tel-00499373⟩

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