Lagrangian manifestation of anomalies in active turbulence

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

doi:10.1103/physrevfluids.7.033101

Cited by 10 publications

(2 citation statements)

References 65 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The average number of streaks in a domain of radius R is therefore N ≃ 2R Γ 2 /2Γ 4 . The formation of alternated streaks in the TTSH model has been observed also in numerical simulations in the absence of boundaries [37], and it is responsible for superdiffusive behavior of Lagrangian tracers [50].…”

mentioning

confidence: 97%

Giant vortex dynamics in confined active turbulence

Puggioni,

Boffetta,

Musacchio

2022

Preprint

View full text Add to dashboard Cite

We report the numerical evidence of a new state of active turbulence in confined domains. By means of extensive numerical simulations of the Toner-Tu-Swift-Hohenberg model for dense bacterial suspensions in circular geometry, we discover the formation a stable, ordered state in which the angular momentum symmetry is broken. This is achieved by self-organization of a turbulent-like flow into a single, giant vortex of the size of the domain. The giant vortex is surrounded by an annular region close to the boundary, characterized by small-scale, radial vorticity streaks. The average radial velocity profile of the vortex is found to be in agreement with a simple analytical prediction. We also provide an estimate of the temporal and spatial scales of a suitable experimental setup comparable with our numerical findings.

show abstract

mentioning

confidence: 97%

Giant vortex dynamics in confined active turbulence

Puggioni,

Boffetta,

Musacchio

2022

Preprint

View full text Add to dashboard Cite

show abstract

“…The underlying reasons for why nature allows such complex, emergent flows in a suspension of active agents, with reasonably simple rules of interactions and motion, ought to be intrinsically related to optimal strategies for evasion and foraging [10,11]. Recent studies have shown that Lagrangian measurements underline a key distinction between these two classes of turbulence whose origin perhaps lies in what is best for the microorganisms which constitute such flows [6,12]. However, in the active turbulence phase, does there exist a limiting behaviour upon increasing activity and a universal state similarly to inertial turbulence with the Reynolds number going to infinity?…”

mentioning

confidence: 99%

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

Mukherjee¹,

Singh²,

James³

et al. 2022

Preprint

Self Cite

View full text Add to dashboard Cite

A hydrodynamic model of active, low Reynolds number suspensions, shows the emergence of an asymptotic state with a universal spectral scaling and non-Gaussian (intermittent) fluctuations in the velocity field. Such states arise when these systems are pushed beyond a critical level of activity and show features akin to high Reynolds number, inertial turbulence. We provide compelling numerical and analytical evidence for the existence of such a transition at a critical value of activity and further show that the maximally chaotic states are tied to this transition.

show abstract