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Local structure of boundary layer transition in experiments with a single streamwise vortex

Manu, KV and Dey, J and Mathew, Joseph (2015) Local structure of boundary layer transition in experiments with a single streamwise vortex. In: EXPERIMENTAL THERMAL AND FLUID SCIENCE, 68 . pp. 381-391.

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Official URL: http://dx.doi.org/10.1016/j.expthermflusci.2015.06...

Abstract

Transition induced by an isolated streamwise vortex embedded in a flat plate boundary layer was studied experimentally. The vortex was created by a gentle hill with a Gaussian profile that spanned on half of the width of a flat plate mounted in a low turbulence wind tunnel. PIV and hot-wire anemometry data were taken. Transition occurs as a non-inclined shear layer breaks up into a sequence of vortices, close to the boundary layer edge. The passing frequency of these vortices scales with square of the freestream velocity, similar to that in single-roughness induced transition. Quadrant analysis of streamwise and wall-normal velocity fluctuations show large ejection events in the outer layer. (C) 2015 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: Streamwise vortex; Boundary layer transition; Shear-layer breakup; Streak instability; Quadrant analysis; Particle Image Velocimetry
Department/Centre: Division of Mechanical Sciences > Aerospace Engineering (Formerly, Aeronautical Engineering)
Date Deposited: 30 Dec 2015 06:05
Last Modified: 30 Dec 2015 06:05
URI: http://eprints.iisc.ernet.in/id/eprint/52951

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