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The baroclinic secondary instability of the two-dimensional shear layer

Reinaud, Jean and Joly, Laurent and Chassaing, Patrick The baroclinic secondary instability of the two-dimensional shear layer. (2000) Physics of Fluids, Vol. 1 (N°10). pp. 2489-2505. ISSN 1070-6631

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Official URL: http://link.aip.org/link/?PHFLE6/12/2489/1

Abstract

The focus of this study is on the numerical investigation of two-dimensional, isovolume, high Reynolds and Froude numbers, variable-density mixing layers. Lagrangian simulations, of both the temporal and the spatial models, are performed. They reveal the breaking-up of the strained vorticity and density-gradient braids, connecting two neighboring primary structures. The secondary instability arises where the vorticity has been intensified by the baroclinic torque. A simplified model of the braid of the variable-density mixing layer, consisting of a strained vorticity and density-gradient filament, is analyzed. It is concluded that the physical mechanism responsible for the secondary instability is the forcing of the vorticity field by the baroclinic torque, itself sensitive to perturbations. This mechanism suggests a rapid route to turbulence for the variable-density mixing layer.

Item Type:Article
Additional Information:http://pof.aip.org/pof/top.jsp
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution: Université de Toulouse > Institut Supérieur de l'Aéronautique et de l'Espace - ISAE
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT
Université de Toulouse > Université Paul Sabatier-Toulouse III - UPS
French research institutions > Centre National de la Recherche Scientifique - CNRS
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Deposited By:Patrick Chassaing

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