Local vortex pairing in a free shear layer
作者:
H. T. Moon,
P. D. Weidman,
期刊:
Physics of Fluids(00319171)
(AIP Available online 1988)
卷期:
Volume 31,
issue 12
页码: 3804-3806
ISSN:0031-9171
年代: 1988
DOI:10.1063/1.866848
出版商: AIP
数据来源: AIP
摘要:
The evolution of large scale vortices as coherent structures in a free shear layer and the corresponding energetics in Fourier space are investigated numerically. The results confirm that vortex pairing as a result of selective energy transfer directly to the subharmonic is a rare event when other instability modes are present with random phases. For this naturally perturbed shear flow, vortices are observed to coalesce locally and intermittently in a manner that leaves isolated vortices between paired states. The spatial and temporal intermittency results in a gradual energy transfer from the linearly unstable mode to larger length scales.
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