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Développement d'un code de calcul pour la simulation d'écoulements de fluides non miscibles. Application à la désintégration assistée d'un jet liquide par un courant gazeux.

Abstract : The object of this thesis was to develop a numerical code for the simulation of diphasic flow with immiscible, incompressible and isothermal fluids in the aim to apply it to the phenomenon of fragmentation of a liquid jet, and more particularly to the air-blasted liquid jet atomization.

Physical hypotheses and associated numerical schemes choices were made to respect in best the complex physic of a liquid jet atomization. The incompressible Navier-Stokes equations numerical resolution is made in a DNS way by means of a projection method. Afterwards, the rising and promising Level-Set method insures the numerical tracking of the surface between two immiscible fluids. Finally, the Ghost Fluid method allows a correct treatment of the discontinuities crossing the interface by respecting at the discret level jump conditions between balance of the capillarity, pressure and viscosity forces. The good capacities of such numerical schemes are shown through some academic tests cases.

The physical mechanisms involved during the primary atomization of a liquid jet made the object of numerous theoretical and experimental studies. The instabilities developing at the surface of the liquid are multiple and clearly three-dimensional. At present and in spite of many research efforts, no theory or model reports strictly this phenomenon. Now, it is shown that the numerical tool can throw a new light. For example, the impact of the gaz boundary layer on the oscillation frequency is studied. We were also able to find by the simulation the intrinsic ligament dynamics in the air-blasted atomization by a liquid jet.
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https://tel.archives-ouvertes.fr/tel-00143709
Contributor : Frédéric Couderc <>
Submitted on : Thursday, April 26, 2007 - 4:40:13 PM
Last modification on : Thursday, March 5, 2020 - 5:57:07 PM
Long-term archiving on: : Wednesday, April 7, 2010 - 2:09:49 AM

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  • HAL Id : tel-00143709, version 1

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Frédéric Couderc. Développement d'un code de calcul pour la simulation d'écoulements de fluides non miscibles. Application à la désintégration assistée d'un jet liquide par un courant gazeux.. Dynamique des Fluides [physics.flu-dyn]. Ecole nationale superieure de l'aeronautique et de l'espace, 2007. Français. ⟨tel-00143709⟩

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