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Turbulence and turbulent pattern formation in a minimal model for active fluids

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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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Citation

James, M., Bos, W. J. T., & Wilczek, M. (2018). Turbulence and turbulent pattern formation in a minimal model for active fluids. Physical Review Fluids, 3(6): 061101. doi:10.1103/PhysRevFluids.3.061101.


Cite as: https://hdl.handle.net/21.11116/0000-0001-ABB4-3
Abstract
Active matter systems display a fascinating range of dynamical states, including stationary patterns and turbulent phases. While the former can be tackled with methods from the field of pattern formation, the spatiotemporal disorder of the active turbulence phase calls for a statistical description. Borrowing techniques from turbulence theory, we here establish a quantitative description of correlation functions and spectra of a minimal continuum model for active turbulence. Further exploring the parameter space, we also report on a surprising type of turbulence-driven pattern formation far beyond linear onset: the emergence of a dynamic hexagonal vortex lattice state after an extended turbulent transient, which can only be explained taking into account turbulent energy transfer across scales.