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Vortex dynamics and Lagrangian statistics in a model for active turbulence

MPG-Autoren
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James,  Martin
Max Planck Research Group Theory of Turbulent Flows, Max Planck Institute for Dynamics and Self-Organization, Max Planck Society;

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Wilczek,  Michael
Max Planck Research Group Theory of Turbulent Flows, Max Planck Institute for Dynamics and Self-Organization, Max Planck Society;

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Zitation

James, M., & Wilczek, M. (2018). Vortex dynamics and Lagrangian statistics in a model for active turbulence. The European Physical Journal E, 41(2): 21. doi:10.1140/epje/i2018-11625-8.


Zitierlink: http://hdl.handle.net/21.11116/0000-0000-ADBF-7
Zusammenfassung
Cellular suspensions such as dense bacterial flows exhibit a turbulence-like phase under certain conditions. We study this phenomenon of "active turbulence" statistically by using numerical tools. Following Wensink et al. (Proc. Natl. Acad. Sci. U.S.A. 109, 14308 (2012)), we model active turbulence by means of a generalized Navier-Stokes equation. Two-point velocity statistics of active turbulence, both in the Eulerian and the Lagrangian frame, is explored. We characterize the scale-dependent features of two-point statistics in this system. Furthermore, we extend this statistical study with measurements of vortex dynamics in this system. Our observations suggest that the large-scale statistics of active turbulence is close to Gaussian with sub-Gaussian tails.