Intermittency, fluctuations and maximal chaos in an emergent universal state of active turbulence

Mukherjee, Siddhartha; Singh, Rahul K.; James, Martin; Ray, Samriddhi Sankar

doi:10.1038/s41567-023-01990-z

Cited by 15 publications

(7 citation statements)

References 40 publications

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“…5I). The fat tails manifest a stronger probability of high-amplitude extreme events associated with small-scale intermittent processes as well recognized in canonical turbulence [55,56] and also highlighted very recently in a dry active system [57]. Here, they are linked to the formation of intense vortical structures yielding a larger relative velocity of two disks.…”

Section: Two-dimensional Melting Via a Hexatic Phasementioning

confidence: 56%

Shaping active matter: from crystalline solids to active turbulence

Zhu

Yang

Jiang

et al. 2023

Preprint

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Active matter drives its constituent agents to move autonomously by harnessing free energy, leading to diverse emergent states with relevance to both biological processes and inanimate functionalities. Achieving maximum reconfigurability of active materials with minimal control remains a desirable yet challenging goal. Here, we employ large-scale, agent-resolved simulations to demonstrate that modulating the activity of a wet phoretic medium alone can govern its solid-liquid-gas phase transitions and, subsequently, laminar-turbulent transitions in fluid phases, thereby shaping its emergent pattern. Our work reproduces and reconciles several seemingly conflicting experimental observations on phoretic active systems, presenting a unified landscape of their collective behaviors. These findings enhance the understanding of long-range, many-body interactions among phoretic agents, offer new insights into non-equilibrium collective phenomena, and provide guidelines for designing reconfigurable materials.

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Section: Two-dimensional Melting Via a Hexatic Phasementioning

confidence: 56%

Shaping active matter: from crystalline solids to active turbulence

Zhu

Yang

Jiang

et al. 2023

Preprint

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“…, in ref. 1–11 and 25. For large values of | ζ |, active-CHNS turbulence has some similarities to conventional 2D fluid turbulence and 2D forced CHNS turbulence, inasmuch as it shows an inverse-cascade region with ( k ) ∼ k −5/3 .…”

Section: Discussionmentioning

confidence: 94%

“…The |z|-dependent, small-k, power-law regime in E(k) is qualitatively reminiscent of parameterdependent small-k power-law regimes in energy-spectra in some minimal models for bacterial turbulence. 3,4,[7][8][9]11,16 The scalar spectrum F(k) of active-CHNS turbulence shows a substantial power-law regime which is different from that in conventional forced 2D CHNS turbulence. 29 It might be possible to develop an EDQNM-type closure for both the energy and the scalar spectra; such a closure might lead to scaling ranges in E(k) and F(k) and values for the exponents that characterize these scaling ranges.…”

Section: Discussionmentioning

confidence: 99%

“…Active turbulence, spatiotemporal chaos in active-matter systems [see, e.g., ref. [1][2][3][4], has garnered considerable attention over the past decade. This intriguing form of turbulence manifests itself in various experimental systems, including bacterial suspensions, 1,[5][6][7][8][9][10][11] suspensions of microtubules, and molecular motors.…”

Section: Introductionmentioning

confidence: 99%

“…In certain models, the energy spectrum of such turbulence exhibits universal power-law behaviors. 4,15 In contrast, there are instances in which power-law exponents for these energy spectra depend on parameters in the model. 7,11,16 The elucidation of the statistical properties of these types of emergent turbulent states continues to be an important challenge in active-matter research.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Novel turbulence and coarsening arrest in active-scalar fluids

Padhan,

Kiran,

Pandit

2024

Soft Matter

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Scaling Transition of Active Turbulence from Two to Three Dimensions

Wei,

Yang,

Wei

et al. 2024

Advanced Science

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Turbulent flows are observed in low‐Reynolds active fluids, which display similar phenomenology to the classical inertial turbulence but are of a different nature. Understanding the dependence of this new type of turbulence on dimensionality is a fundamental challenge in non‐equilibrium physics. Real‐space structures and kinetic energy spectra of bacterial turbulence are experimentally measured from two to three dimensions. The turbulence shows three regimes separated by two critical confinement heights, resulting from the competition of bacterial length, vortex size and confinement height. Meanwhile, the kinetic energy spectra display distinct universal scaling laws in quasi‐2D and 3D regimes, independent of bacterial activity, length, and confinement height, whereas scaling exponents transition in two steps around the critical heights. The scaling behaviors are well captured by the hydrodynamic model we develop, which employs image systems to represent the effects of confining boundaries. The study suggests a framework for investigating the effect of dimensionality on non‐equilibrium self‐organized systems.

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Intermittency, fluctuations and maximal chaos in an emergent universal state of active turbulence

Cited by 15 publications

References 40 publications

Shaping active matter: from crystalline solids to active turbulence

Shaping active matter: from crystalline solids to active turbulence

Novel turbulence and coarsening arrest in active-scalar fluids

Scaling Transition of Active Turbulence from Two to Three Dimensions

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