Investigating mode competition and three-dimensional features from two-dimensional velocity fields in an open cavity flow by modal decompositions

Guéniat, Florimond and Pastur, Luc and Lusseyran, Francois (2014) Investigating mode competition and three-dimensional features from two-dimensional velocity fields in an open cavity flow by modal decompositions. Physics of Fluids, 26 (8). ISSN 1070-6631

[img]
Preview
Text (Published Version)
PoF_2014.pdf - Published Version

Download (3MB)

Abstract

Shear-layer driven open cavity flows are known to exhibit strong self-sustained oscillations of the shear-layer. Over some range of the control parameters, a competition between two modes of oscillations of the shear layer can occur. We apply both Proper Orthogonal Decomposition and Dynamic Mode Decomposition to experimental two-dimensional two-components time and spaced velocity fields of an incompressible open cavity flow, in a regime of mode competition. We show that, although proper orthogonal decomposition successes in identifying salient features of the flow, it fails at identifying the spatial coherent structures associated with dominant frequencies of the shear-layer oscillations. On the contrary, we show that, as dynamic mode decomposition is devoted to identify spatial coherent structures associated with clearly defined frequency channels, it is well suited for investigating coherentstructuresinintermittentregimes.Weconsiderthevelocitydivergencefield, inordertoidentifyspanwisecoherentfeaturesoftheflow.Finally,weshowthatboth coherent structures in the inner-flow and in the shear-layer exhibit strong spanwise velocitygradients,andarethereforethree-dimensional

Item Type: Article
Additional Information: This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in Physics of Fluids (1994-present) 26, 085101 (2014); doi: 10.1063/1.4891254 and may be found at https://aip.scitation.org/doi/10.1063/1.4891254.
Identification Number: https://doi.org/10.1063/1.4891254
Dates:
DateEvent
1 August 2014Published Online
14 July 2014Accepted
Subjects: CAH07 - physical sciences > CAH07-04 - general, applied and forensic sciences > CAH07-04-01 - physical sciences (non-specific)
CAH10 - engineering and technology > CAH10-01 - engineering > CAH10-01-01 - engineering (non-specific)
CAH10 - engineering and technology > CAH10-01 - engineering > CAH10-01-10 - others in engineering
Divisions: Faculty of Computing, Engineering and the Built Environment
Faculty of Computing, Engineering and the Built Environment > School of Engineering and the Built Environment
Depositing User: Euan Scott
Date Deposited: 17 Jan 2019 11:28
Last Modified: 03 Mar 2022 15:34
URI: http://www.open-access.bcu.ac.uk/id/eprint/6860

Actions (login required)

View Item View Item

Research

In this section...