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Etude de stabilité linéaire globale d'écoulement fortement décollé de couche limite de plaque plane

Abstract : The understanding of the transition mechanisms of laminar separated flows, which occur in many industrial applications, has a particular scientific interest. Notably, an accurate prediction of the first bifurcation and the development of reduced models associated to the dynamic of the perturbation could allow an optimization of the control procedure and increase the aerodynamic performances. In this context, we propose through this work an original stability analysis which takes into account the non parallelism effects of the flow. In particular, a global linear stability analysis on a flat plate separated flow, identify the influence of 2D and 3D global modes in the space and time dynamics of the perturbation. More specifically, a such study identify mechanisms not revealed by the classical approaches, as a large 2D transient amplifying behavior along the shear layer and a centrifugal mechanism leading to a 3D bifurcation of the separated flow. Finally, the global modes decomposition leads to an efficient reduced model in order to develop control strategies.
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https://pastel.archives-ouvertes.fr/pastel-00003596
Contributor : Ecole Arts Et Métiers Paristech <>
Submitted on : Thursday, April 3, 2008 - 8:00:00 AM
Last modification on : Wednesday, December 11, 2019 - 1:22:02 PM
Long-term archiving on: : Thursday, September 30, 2010 - 8:24:44 PM

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Frédéric Alizard. Etude de stabilité linéaire globale d'écoulement fortement décollé de couche limite de plaque plane. Sciences de l'ingénieur [physics]. Arts et Métiers ParisTech, 2007. Français. ⟨NNT : 2007ENAM0036⟩. ⟨pastel-00003596⟩

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