AustralieFrV1, Main, Exploration, bibRecord, 003F19

Three-dimensional instabilities over a rectangular open cavity: from linear stability analysis to experimentation

Identifieur interne : 003F19 ( Main/Exploration ); précédent : 003F18; suivant : 003F20

Three-dimensional instabilities over a rectangular open cavity: from linear stability analysis to experimentation

Auteurs : J. De Vicente [Espagne] ; J. Basley [Australie, France] ; F. Meseguer-Garrido [Espagne] ; J. Soria [Australie] ; V. Theofilis [Espagne]

Source :

Journal of Fluid Mechanics [ 0022-1120 ] ; 2014.

RBID : Pascal:14-0165624

Descripteurs français

Pascal (Inist)
- Instabilité hydrodynamique, Ecoulement tridimensionnel, Couche cisaillée, Aéroacoustique, Etude expérimentale, Etude théorique, Résonateur cavité, 4720F, 4328.

English descriptors

KwdEn :
- Aeroacoustics, Cavity resonators, Experimental study, Hydrodynamic instability, Shear layer, Theoretical study, Three dimensional flow.

Abstract

Three-dimensional instabilities arising in open cavity flows are responsible for complex broad-banded dynamics. Existing studies either focus on theoretical properties of ideal simplified flows or observe the final state of experimental flows. This paper aims to establish a connection between the onset of the centrifugal instabilities and their final expression within the fully saturated flow. To that end, a linear three-dimensional modal instability analysis of steady two-dimensional states developing in an open cavity of aspect ratio L/D = 2 (length over depth) is conducted. This analysis is performed together with an experimental study in the same geometry adding spanwise endwalls. Two different Reynolds numbers are investigated through spectral analyses and modal decomposition. The physics of the flow is thoroughly described exploiting the strengths of each methodology. The main flow structures are identified and salient space and time scales are characterised. Results indicate that the structures obtained from linear analysis are mainly consistent with the fully saturated experimental flow. The analysis also brings to light the selection and alteration of certain wave properties, which could be caused by nonlinearities or the change of spanwise boundary conditions.

Affiliations:

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Le document en format XML

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<front><div type="abstract" xml:lang="en">Three-dimensional instabilities arising in open cavity flows are responsible for complex broad-banded dynamics. Existing studies either focus on theoretical properties of ideal simplified flows or observe the final state of experimental flows. This paper aims to establish a connection between the onset of the centrifugal instabilities and their final expression within the fully saturated flow. To that end, a linear three-dimensional modal instability analysis of steady two-dimensional states developing in an open cavity of aspect ratio L/D = 2 (length over depth) is conducted. This analysis is performed together with an experimental study in the same geometry adding spanwise endwalls. Two different Reynolds numbers are investigated through spectral analyses and modal decomposition. The physics of the flow is thoroughly described exploiting the strengths of each methodology. The main flow structures are identified and salient space and time scales are characterised. Results indicate that the structures obtained from linear analysis are mainly consistent with the fully saturated experimental flow. The analysis also brings to light the selection and alteration of certain wave properties, which could be caused by nonlinearities or the change of spanwise boundary conditions.</div>
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Three-dimensional instabilities over a rectangular open cavity: from linear stability analysis to experimentation

Three-dimensional instabilities over a rectangular open cavity: from linear stability analysis to experimentation

Source :

Descripteurs français

English descriptors

Abstract

Links toward previous steps (curation, corpus...)

Le document en format XML

Pour manipuler ce document sous Unix (Dilib)

Pour mettre un lien sur cette page dans le réseau Wicri