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SIMULATION DES GRANDES ECHELLES D'ECOULEMENTS TURBULENTS SUPERSONIQUES

Abstract : This work, supported by CNES and SNECMA, deals with numerical simulation of supersonic turbulent flows when shock/turbulent boundary layer interaction occurs. Such flows reveal the existence of complex mechanisms, which have to be well understood for an efficient design of rocket nozzles. In this study, large eddy simulation is used to investigate unsteady mechanisms. Since a shock-capturing scheme is used, an hybrid numerical scheme has been developed to reduce its dissipative properties. The issue of the generation of coherent turbulent boundary conditions is also taken in account. A method originally developed by Lund, based on a rescaling technique, has been retained, and allows the simulation to produce its own inlet boundary conditions. It is found that computations results are in very good agreement with experimental data and DNS. Especially, oscillations of the reflected shock occurring at low frequencies are observed, in agreement with experimental investigations. Moreover, simulations reveal the presence of such frequencies inside the recirculation bubble. This point gives credit to the hypothesis which presents the instabilities of the reflected shock as a consequence of the dynamic properties of the separated zone.
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https://tel.archives-ouvertes.fr/tel-00011588
Contributor : Samuel Dubos <>
Submitted on : Saturday, February 11, 2006 - 11:34:41 AM
Last modification on : Tuesday, February 5, 2019 - 11:44:13 AM
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  • HAL Id : tel-00011588, version 1

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Samuel Dubos. SIMULATION DES GRANDES ECHELLES D'ECOULEMENTS TURBULENTS SUPERSONIQUES. Modélisation et simulation. INSA de Rouen, 2005. Français. ⟨tel-00011588⟩

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