Simulation des grandes échelles des instationnarités basses fréquences d'une interaction onde de choc - couche limite sur plaque plane

Abstract : Shock wave / turbulent boundary layer interactions arising on aeronautical vehicles are prone to unsteadiness with a low frequency of few hundred Hertz, which can induce severe aerodynamic loads. The present study is done in the framework of the ANR project SPICEX, which deals with the numerical modeling of these low-frequency phenomena. The unsteady dynamics of a shock wave / turbulent boundary layer interaction (SWTBLI) on a flat plate is investigated. A numerical tool based on Large Eddy Simulation (LES) is developed for the compressible regime. In particular, efficient strategies for shock capturing and turbulent inflow generation are implemented. A particular attention is devoted to the validation of the present algorithms, notably concerning the LES models. Turbulent boundary layer and SWTBLI simulations are conducted, and give confidence in the present numerical strategy. LES of an unsteady SWTBLI covering dozens of low-frequency cycles is performed. The results suggest that the low-frequency dynamics is related to a global synchronization of the flow, characterized by a cyclic breathing motion of the recirculation bubble, associated with a fore-and aft motion of the reflected shock, together with a modulation of the mixing layer. The study shows that the coupling between the restoring force due to the incident shock and the disturbances generated by the incoming turbulence and the mixing layer is responsible for the low-frequency broadband modulation of the vortex shedding in the downstream flow, corresponding statistically to the low frequency of interest.
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https://pastel.archives-ouvertes.fr/pastel-00728991
Contributor : Guillaume Aubard <>
Submitted on : Friday, September 7, 2012 - 11:10:59 AM
Last modification on : Wednesday, May 29, 2019 - 5:53:27 PM
Long-term archiving on : Saturday, December 8, 2012 - 3:40:29 AM

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Guillaume Aubard. Simulation des grandes échelles des instationnarités basses fréquences d'une interaction onde de choc - couche limite sur plaque plane. Mécanique des fluides [physics.class-ph]. Arts et Métiers ParisTech, 2012. Français. ⟨NNT : 2012ENAM0019⟩. ⟨pastel-00728991⟩

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