Alizard, Frédéric (2007) Global linear stability analysis of a flat plate separated flow. PhD thesis Mécanique, SINUMEF, ENSAM 2007ENAM0036 p.174.
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.
| Item Type: | PhD Thesis (PhD) |
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| Thesis Supervisor: | Lerat, Alain |
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| Date: | 17 December 2007 |
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| Board of examiners: | Ehrenstein, Uwe and Casalis, Grégoire and Robinet, Jean-Christophe and Lerat, Alain and Jacquin, Laurent and Rist, Ulrich |
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| Ecole Doctorale: | ED 432 ECOLE DOCTORALE SCIENCES DES METIERS DE L'INGENIEUR |
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| Discipline: | Mécanique |
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| Collection (Fonds): | ENSAM |
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| Institution: | ENSAM |
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| Department: | SINUMEF |
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| Subjects: | 5. Fluid Mechanics and Energy |
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| Uncontrolled Keywords: | écoulement décollé laminaire, Stabilité linéaire globale, mécanismes 2D et 3D, Réduction de modèle, Laminar separated flow, Global linear stability, 2D and 3D mechanisms, Reduced models |
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