Longitudinal vortex structure in the flow field produced by a vortex ring impinging on a flat plate

The flow field produced by a vortex ring at Re=2600 impinging on a flat plate was examined in detail using the smoke visualization method. The longitudinal vortex structure with a finger-like configuration was found which plays a crucial role in forming azimuthal coherent structures with a cross sec...

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Bibliographic Details
Published in:Fluid dynamics research 2001-01, Vol.28 (1), p.61-74
Main Authors: Naitoh, Takashi, Banno, Osamu, Yamada, Hideo
Format: Article
Language:English
Subjects:
Azimuthal instability
Induced vortex
Longitudinal vortex
Smoke visualization method
Vortex ring
Wall shear flow
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Summary:The flow field produced by a vortex ring at Re=2600 impinging on a flat plate was examined in detail using the smoke visualization method. The longitudinal vortex structure with a finger-like configuration was found which plays a crucial role in forming azimuthal coherent structures with a cross section that resembles that of an orange; the structures promote the flow field into turbulent state. The generating and developing process of the longitudinal vortex are discussed, and the topological aspects are inferred by integrating the information obtained through various local visualizations.
ISSN:0169-5983
1873-7005
1873-7005
DOI:10.1016/S0169-5983(00)00016-2