# Étude théorique et numérique des écoulements cisaillés libres à masse volumique fortement variable

Abstract : The subject of this work concerns the application of large-eddy simulation to the mixing of two fluids with different thermodynamical properties.
Numerical errors in the discretisation of Navier-Stokes equations and their interaction with subgrid models are investigated on a self decaying isotropic homogeneous turbulence. A high resolution numerical code is then developed for the simulation of binary mixing layers. Reduction of early acoustic waves' amplitude is achieved by use of a temporal self-similar initial condition.
The relative magnitude of subgrid terms arising from filtered equations is investigated on explicit filtering of direct numerical simulation results of temporal $N_2/O_2$ and $H_2/O_2$ mixing layers.
Implicit closure (MILES) is then evocated on the basis of WENO schemes.
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Cited literature [118 references]

https://tel.archives-ouvertes.fr/tel-00006483
Contributor : Nicolas Lardjane <>
Submitted on : Sunday, July 18, 2004 - 3:26:27 PM
Last modification on : Thursday, March 5, 2020 - 6:49:19 PM
Long-term archiving on: : Wednesday, September 12, 2012 - 4:45:17 PM

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• HAL Id : tel-00006483, version 1

### Citation

Nicolas Lardjane. Étude théorique et numérique des écoulements cisaillés libres à masse volumique fortement variable. Modélisation et simulation. Université d'Orléans, 2002. Français. ⟨tel-00006483⟩

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