Journal of Fluid Science and Technology
Online ISSN : 1880-5558
ISSN-L : 1880-5558
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Vortical Structures in High-Reynolds-Number Jet Indicating Edgetone Oscillation
Yuta KAWAIYoshiyuki TSUJIYutaka KUKITA
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2007 Volume 2 Issue 3 Pages 665-678

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Abstract

Coherent vortical structures in a high-Reynolds number turbulent jet indicating edgetone oscillations are extracted from velocity and pressure data. Three statistical quantities are adopted as the candidate indicators of coherent structures; (i) phase-averaged vorticity, (ii) phase-averaged pressure, and (iii) phase-averaged velocity gradient tensor. All these quantities work well for extracting coherent structures in a test case of low-Reynolds number cylinder wake. However, when applied to the high-Reynolds number edgetone flow, (ii) and (iii) indicate much better performance than (i), because (i) is affected by the background time-averaged vorticity field. The advection speed of coherent structures is evaluated and compared with Powell's feedback mechanism.

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© 2007 by The Japan Society of Mechanical Engineers
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