Inhomogeneous turbulence in the vicinity of a large scale coherent vortex

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 --...

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Bibliographic Details
Published inarXiv.org
Main Authors Simand, C, Chilla, F, J -F Pinton
Format Paper
LanguageEnglish
Published Ithaca Cornell University Library, arXiv.org 21.07.1999
Subjects
Fluid flow
Intermittency
Probability density functions
Reynolds number
Turbulence
Variation
Vortices
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Summary: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.
ISSN:2331-8422
DOI:10.48550/arxiv.9907026