The Vortex Breakdown of a Columnar Vortex with Axial Flow

Takahashi, N.; Miyazaki, T.

doi:10.1007/978-3-540-75995-9_22

N. Takahashi³ &
T. Miyazaki³

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Abstract

The vortex breakdown of a columnar vortex with axial flow (q-vortex[1]) is investigated numerically. The formation of turbulent eddies around the columnar vortex and the vortex-core deformations are studied in detail by visualizing the flow field. In the marginally stable case with q = -1.5, small thin spiral structures are formed inside the vortex core. In the unstable case with q = -0.45, the linear unstable modes grow until the columnar vortex completes one turn. The data for the growth rate agree with that of the linear analysis [2]. After the vortex completes two turns, a secondary instability is excited which causes the collapse of the columnar q-vortex, after which many fine scale vortices appear spontaneously.

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Authors and Affiliations

Department of Mechanical Engineering and Intelligent Systems, University of Electro-Communications, Chofu, Tokyo, 182-8585, Japan
N. Takahashi & T. Miyazaki

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N. Takahashi
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T. Miyazaki
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Editors and Affiliations

China Aerospace Corporation, Science and Technology Council, P.O.Box 849, 100830, Beijing, China
F. G. Zhuang
Institute of Mechanics, Chinese Academy of Science, 100080, Beijing, China
J. C. Li

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Takahashi, N., Miyazaki, T. (2007). The Vortex Breakdown of a Columnar Vortex with Axial Flow. In: Zhuang, F.G., Li, J.C. (eds) New Trends in Fluid Mechanics Research. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-75995-9_22

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DOI: https://doi.org/10.1007/978-3-540-75995-9_22
Publisher Name: Springer, Berlin, Heidelberg
Print ISBN: 978-3-540-75994-2
Online ISBN: 978-3-540-75995-9
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