OATAO - Open Archive Toulouse Archive Ouverte Open Access Week

Global stability and control of the confined turbulent flow past a thick flat plate

Carini, Marco and Airiau, Christophe and Debien, Antoine and Léon, Olivier and Pralits, J.O. Global stability and control of the confined turbulent flow past a thick flat plate. (2017) Physics of Fluids, 29 (2). 024102/1-024102/19. ISSN 1070-6631

[img]
Preview
(Document in English)

PDF (Publisher's version) - Requires a PDF viewer such as GSview, Xpdf or Adobe Acrobat Reader
6MB

Official URL: http://dx.doi.org/10.1063/1.4974069

Abstract

This article investigates the structural stability and sensitivity properties of the confined turbulent wake behind an elongated D-shaped cylinder of aspect-ratio 10 at Re = 32 000. The stability analysis is performed by linearising the incompressible Navier-Stokes equations around the numerically computed and the experimentally measured mean flows. We found that the vortex-shedding frequency is very well captured by the leading unstable global mode, especially when the additional turbulent diffusion is modelled in the stability equations by means of a frozen eddy-viscosity approach. The sensitivity maps derived from the computed and the measured mean flows are then compared, showing a good qualitative agreement. The careful inspection of their spatial structure highlights that the highest sensitivity is attained not only across the recirculation bubble but also at the body blunt-edge, where tiny pockets of maximum receptivity are found. The impact of the turbulent diffusion on the obtained results is investigated. Finally, we show how the knowledge of the unstable adjoint global mode of the linearised mean-flow dynamics can be exploited to design an active feedback control of the unsteady turbulent wake, which leads, under the adopted numerical framework, to completely suppress its low-frequency oscillation.

Item Type:Article
Additional Information:Thanks to AIP editor. The original PDF of the article can be found at http://aip.scitation.org/doi/10.1063/1.4974069
HAL Id:hal-01474193
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE)
French research institutions > Office National d'Etudes et Recherches Aérospatiales - ONERA (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UT3 (FRANCE)
Other partners > Università degli Studi di Genova - UNIGE (ITALY)
Laboratory name:
Funders:
RTRA-STAE Foundation of Toulouse - Calmip computing centre of Toulouse
Statistics:download
Deposited On:28 Sep 2017 09:17

Repository Staff Only: item control page