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Simulation aux Grandes Échelles de l'Atomisation, Application à l'Injection Automobile.

Abstract : Liquid injection takes an important part in many physical processes, especially within internal combustion engine (ICE). Up to know the Reynolds Averaged Navier-Stokes (RANS) approach has been widely used, both in Eulerian and Lagrangian framework. Several works on atomization have been done in our team developing the ELSA model. However, LES of atomization seems to be a necessarily step forward. In addition to standard LES method for turbulent flows, a special attention is necessarily to represent the interface. Two limit cases have to be considered : - The liquid surface can be well captured with the available mesh size (or filter size) then the LES formulation must recover the DNS methods used to track the interface (such as Level Set or VOF). - The liquid surface wrinkles size are smaller than the mesh size and the two-phase LES formulation must recover the LES used for spray where finally droplets are considered very small by comparison to the mesh size. In this work we present a LES method for two phase flow that can recover these two limits. It is shown that the unresolved SGS (Sub Grid Scale) term that appears in the phase function equation plays an important role, even if it is very small by comparison to the resolved contribution. Application of this method to the atomization of a Diesel jet is presented. LES results are then compared to a DNS data base.
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https://tel.archives-ouvertes.fr/tel-00604870
Contributor : Chesnel Jérémy Connect in order to contact the contributor
Submitted on : Wednesday, June 29, 2011 - 11:30:30 PM
Last modification on : Tuesday, October 19, 2021 - 4:13:58 PM
Long-term archiving on: : Friday, September 30, 2011 - 2:25:42 AM

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  • HAL Id : tel-00604870, version 1

Citation

Jeremy Chesnel. Simulation aux Grandes Échelles de l'Atomisation, Application à l'Injection Automobile.. Modélisation et simulation. Université de Rouen, 2010. Français. ⟨tel-00604870⟩

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