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Volume 17, Issue 3
March 2005
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Research Article| February 08 2005
Naoya Takahashi;
Naoya Takahashi a)
Department of Mechanical Engineering and Intelligent Systems, University of Electro-Communications
, Chofu, Tokyo 182-8585, Japan
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Hiroyuki Ishii;
Hiroyuki Ishii
Department of Mechanical Engineering and Intelligent Systems, University of Electro-Communications
, Chofu, Tokyo 182-8585, Japan
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Takeshi Miyazaki
Takeshi Miyazaki
Department of Mechanical Engineering and Intelligent Systems, University of Electro-Communications
, Chofu, Tokyo 182-8585, Japan
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Author & Article Information
a)
Electronic mail: naoya@mce.uec.ac.jp
Physics of Fluids 17, 035105 (2005)
Article history
Received:
September 22 2004
Accepted:
December 07 2004
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Citation
Naoya Takahashi, Hiroyuki Ishii, Takeshi Miyazaki; The influence of turbulence on a columnar vortex. Physics of Fluids 1 March 2005; 17 (3): 035105. https://doi.org/10.1063/1.1858532
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The interaction between a columnar vortex and external turbulence is investigated numerically. A Lamb–Oseen vortex is immersed in an initially isotropic homogeneous turbulence field, which itself is produced numerically by a direct numerical simulation of decaying turbulence. The formation of inhomogeneous fine turbulent eddies around the columnar vortex and the vortex-core deformations are studied in detail by visualizing the flow field. The initially random turbulent eddies (worms) are wrapped around the columnar vortex and become spirals. Statistical quantities, such as two-point-energy spectra and two-point-enstrophy spectra, are evaluated and compared with the theoretical predictions from rapid distortion theory. The axial velocity correlation dominates near the vortex surface, whereas the radial velocity correlation becomes larger where the worms are wrapped. Where the columnar vortex is strong compared with the external turbulence, external velocity disturbances are blocked by the vortex and they cannot penetrate into the vortex core directly, whereas various types of vortex waves (Kelvin waves) are excited.
Topics
Oceanography, Stellar structure and properties, Axial symmetry, Computational fluid dynamics, Eddies, Navier Stokes equations, Turbulent flows, Vortex dynamics, Birds, Worms
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© 2005 American Institute of Physics.
2005
American Institute of Physics
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