Inhomogeneous turbulence in the vicinity of a large scale coherent vortex

Details Inhomogeneous turbulence in the vicinity of a large scale coherent vortex Inhomogeneous turbulence in the vicinity of a large scale coherent vortex

1999-07-21

arxiv.org/abs/chao-dyn/9907026v1

Nonlinear Sciences

Chaotic Dynamics

submitted to europhys lett, 6 pages, 5 figures

Scientific paper

10.1209/epl/i2000-00501-8

We study the statistics of turbulent velocity fluctuations in the neighbourhood of a strong large scale vortex at very large Reynolds number. At each distance from the vortex core, we observe that the velocity spectrum has a power law ``inertial range'' of scales and that intermittency -- defined as the variation of the probability density function (PDF) of velocity increments as the length of the increment is varied -- is also present. We show that the spectrum scaling exponents and intermittency characteristics vary with the distance to the vortex. They are also influenced by the large scale dynamics of the vortex.

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