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Network structure of two-dimensional decaying isotropic turbulence

Published online by Cambridge University Press:  15 April 2016

Kunihiko Taira ,
Aditya G. Nair  and
Steven L. Brunton
Kunihiko Taira*
Affiliation:
Department of Mechanical Engineering, Florida State University, Tallahassee, FL 32310, USA
Aditya G. Nair
Affiliation:
Department of Mechanical Engineering, Florida State University, Tallahassee, FL 32310, USA
Steven L. Brunton
Affiliation:
Department of Mechanical Engineering, University of Washington, Seattle, WA 98195, USA
*
†Email address for correspondence: [email protected]
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Abstract

The present paper reports on our effort to characterize vortical interactions in complex fluid flows through the use of network analysis. In particular, we examine the vortex interactions in two-dimensional decaying isotropic turbulence and find that the vortical-interaction network can be characterized by a weighted scale-free network. It is found that the turbulent flow network retains its scale-free behaviour until the characteristic value of circulation reaches a critical value. Furthermore, we show that the two-dimensional turbulence network is resilient against random perturbations, but can be greatly influenced when forcing is focused towards the vortical structures, which are categorized as network hubs. These findings can serve as a network-analytic foundation to examine complex geophysical and thin-film flows and take advantage of the rapidly growing field of network theory, which complements ongoing turbulence research based on vortex dynamics, hydrodynamic stability, and statistics. While additional work is essential to extend the mathematical tools from network analysis to extract deeper physical insights of turbulence, an understanding of turbulence based on the interaction-based network-theoretic framework presents a promising alternative in turbulence modelling and control efforts.

JFM classification

Turbulent Flows: Isotropic turbulence Mathematical Foundations: Mathematical Foundations Vortex Flows: Vortex interactions
Type
Rapids
Information
Journal of Fluid Mechanics , Volume 795 , 25 May 2016 , R2
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Copyright
© 2016 Cambridge University Press 

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