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Analyse de stabilité globale pour un écoulement transsonique soumis au phénomène de tremblement de voilure

Abstract : Experiments on transonic flow over an airfoil have revealed a characteristic oscillatory motion of the transonic shock location. This shock buffeting causes oscillatory wing loads that are detrimental to both lift generation and material fatigue. The description of this low-frequency shock oscillation shall be the subject of this thesis where special emphasis shall be directed at explaining the physical mechanisms underlying this phenomenon as well as efficient means in manipulating it. Iterative techniques, applied to direct numerical simulations and resulting in global modes, are expected to shed light on the dominant features that cause shock buffeting. So this memory will include a variety of techniques ranging from global stability analysis to direct numerical simulations of transonic flow subjected shock buffeting. In particular, the approach of this thesis will take as a starting point the work carried out by the team of Crouch. In this context, the objective of this thesis is the development of a digital tool making it possible to study the global stability of transonic flow for unspecified geometries. In this work, we will implement in the software elsA of ONERA, to obtain the basic flow and the achievement of the extraction of the Jacobin matrix of the RANS equations linearized. The purpose of this objective is to prove that we are able to find the actors responsible for the phenomenon of buffeting that appears on the upper surface of a bi-dimensional wing.
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Contributor : Sarah Benbaba <>
Submitted on : Friday, January 27, 2012 - 12:53:42 PM
Last modification on : Wednesday, March 27, 2019 - 4:39:25 PM
Long-term archiving on: : Saturday, April 28, 2012 - 2:25:10 AM

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  • HAL Id : pastel-00663520, version 1

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Sarah Benbaba. Analyse de stabilité globale pour un écoulement transsonique soumis au phénomène de tremblement de voilure. Mécanique des fluides [physics.class-ph]. Ecole Polytechnique X, 2011. Français. ⟨pastel-00663520⟩

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