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Changes to invariants of the velocity gradient tensor at the turbulent-nonturbulent interface of compressible mixing layers

Mathew, Joseph and Ghosh, S and Friedrich, R (2016) Changes to invariants of the velocity gradient tensor at the turbulent-nonturbulent interface of compressible mixing layers. In: INTERNATIONAL JOURNAL OF HEAT AND FLUID FLOW, 59 . pp. 125-130.

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Official URL: http://dx.doi.org/10.1016/j.ijheatfluidflow.2016.0...

Abstract

Analyses of invariants of the velocity gradient tensor (VGT) at the turbulent-nonturbulent interface of temporal plane mixing layers reveal a new type of joint pdf. When compressibility effects are small, fluid packets from the surrounding nonturbulent freestream enter the turbulent region in sheet-like zones; the VGT has one positive (compression) and two negative (expansion) eigenvalues. When compressibility effects are significant, in some parts of the turbulent-nonturbulent interface two of the eigenvalues are positive and one is negative. The implied local flow is that of streamtubes surrounded by vortex arcs (partial rings). The new topology occurs less frequently than the sheet-like regions. (C) 2016 Elsevier Inc. All rights reserved.

Item Type: Journal Article
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Additional Information: Copy right for this article belongs to the ELSEVIER SCIENCE INC, 360 PARK AVE SOUTH, NEW YORK, NY 10010-1710 USA
Keywords: Compressible; Turbulent; Turbulent-nonturbulent interface
Department/Centre: Division of Mechanical Sciences > Aerospace Engineering (Formerly, Aeronautical Engineering)
Date Deposited: 15 Jun 2016 06:11
Last Modified: 15 Jun 2016 06:11
URI: http://eprints.iisc.ernet.in/id/eprint/53948

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