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Dipoles and streams in two-dimensional turbulence

Published online by Cambridge University Press:  14 October 2020

Javier Jiménez Open the ORCID record for Javier Jiménez [Opens in a new window]
Javier Jiménez*
Affiliation:
School of Aeronautics, Universidad Politécnica Madrid, 28040Madrid, Spain
*
†Email address for correspondence: [email protected]
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Abstract

Following the suggestion from the Monte–Carlo experiments in Jiménez (J. Turbul., 2020, doi:10.1080/14685248.2020.1742918) that dipoles are as important to the dynamics of decaying two-dimensional turbulence as individual vortex cores, it is found that the kinetic energy of this flow is carried by elongated streams formed by the concatenation of dipoles. Vortices separate into a family of small fast-moving cores, and another family of larger slowly moving ones, which can be described as ‘frozen’ into a slowly evolving ‘crystal.’ The kinematics of both families are very different, and only the former is self-similar. The latter is responsible for most of the kinetic energy of the flow, and its vortices form the dipoles and the streams. Mechanisms are discussed for the growth of this slow component.

JFM classification

Turbulent Flows: Turbulence theory Vortex Flows: Vortex interactions
Type
JFM Papers
Information
Journal of Fluid Mechanics , Volume 904 , 10 December 2020 , A39
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Copyright
© The Author(s), 2020. Published by Cambridge University Press

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