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Etude des instabilités d'un écoulement décollé induit par une bosse

Abstract : The objective of this work is to improve our understanding of the dynamics of the separation in view to define the key parameters in order to design a simplified and predictive model of the separation in exchange for the classical stationary and bidimensional model. This work will be devoted to the discovery of the unstable mechanisms induced by the boundary layer separation. These will be observed initially by quick visualization at low number of Kármán, then at high number of Kármán by means of snapshots Piv. To study more finely the occurrences of these pseudo-periodic vortex phenomena, a study of the spectral contents will be detailed by focusing on the spectral content in the vicinity of the separated bulb and the wall, the objective being to quantify the frequencies as well as the phenomena quasi-periodic associated with them. The analysis will cover the spectra of fluctuations in speed and friction, for which different characteristic frequencies will be revealed. The objective here is to associate the frequency emergences with the various instabilities induced by the boundary layer separation and also to identify spatially their evolution.
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Submitted on : Tuesday, November 23, 2021 - 8:30:10 AM
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  • HAL Id : hal-03442151, version 1

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Fawzi Fadla, Ayoub Bouanik, Laurent Keirsbulck. Etude des instabilités d'un écoulement décollé induit par une bosse. 23ème Congrès Français de Mécanique, Aug 2017, Lille, France. ⟨hal-03442151⟩

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