Lagrangian manifestation of anomalies in active turbulence

@article{Singh2022LagrangianMO,
  title={Lagrangian manifestation of anomalies in active turbulence},
  author={Rahul K. Singh and Siddhartha Mukherjee and Samriddhi Sankar Ray},
  journal={Physical Review Fluids},
  year={2022}
}
We show that Lagrangian measurements in active turbulence bear imprints of turbulent and anomalous streaky hydrodynamics leading to a self-selection of persistent trajectories— L´evy walks — over diffusive ones. This emergent dynamical heterogeneity results in a super-diffusive first passage distribution which could lead to biologically advantageous motility. We then go beyond single-particle statistics to show that for the pair-dispersion problem as well, active flows are at odds with inertial… 
[PDF] Semantic Reader
1 Citations
Background Citations
1

Figures from this paper

One Citation

Irreversiblity in Bacterial Turbulence: Insights from the Mean-Bacterial-Velocity Model

Kolluru Venkata Kiran,1, ∗ Anupam Gupta,2, † Akhilesh Kumar Verma,3, ‡ and Rahul Pandit4, § Centre for Condensed Matter Theory, Department of Physics, Indian Institute of Science, Bangalore, 560012,…

References

SHOWING 1-10 OF 72 REFERENCES

Pair dispersion and doubling time statistics in two-dimensional turbulence.

Experimental measurements of pair separation statistics in two-dimensional turbulence are reported for an electromagnetically forced stratified-layer system with simultaneous ranges of direct-enstrophy and inverse-energy transfer separated by a well-defined spatial injection scale and it is shown how the measured scalings of the mean quantities are consistent with exponential behavior in the enstrophy range and power-lawbehavior in the inverse- energy range.

Meso-scale turbulence in living fluids

The authors' experimental results for the bacterial flow statistics agree well with predictions from a minimal model for self-propelled rods, suggesting that at high concentrations the collective motion of the bacteria is dominated by short-range interactions.

Anomalous Diffusion and Lévy Walks Distinguish Active from Inertial Turbulence.

It is shown that such dense active suspensions manifest superdiffusion, via Lévy walks, which masquerades as a crossover from ballistic to diffusive scaling in measurements of mean-squared displacements, and is tied to the emergence of hitherto undetected oscillatory streaks in the flow.

Generative Art: A Practical Guide Using Processing

This chapter discusses Generative art in theory and practice, and a programming language for artists, called Processing, which addresses the problem of randomness and noise in the context of generative art.

Swarming bacteria migrate by Lévy Walk

By tracking trajectories of fluorescently labelled individuals within such dense swarms, it is found that the bacteria are performing super-diffusion, consistent with Lévy walks.

Statistics of two-particle dispersion in two-dimensional turbulence

We investigate Lagrangian relative dispersion in direct numerical simulation of two-dimensional inverse cascade turbulence. The analysis is performed by using both standard fixed time statistics and…

Processing: a programming handbook for visual designers and artists

This second edition has been thoroughly updated and is the first book to offer in-depth coverage of Processing 2.0, and every chapter has been revised, and new chapters introduce new ways to work with data and geometry.

Irreversiblity in Bacterial Turbulence: Insights from the Mean-Bacterial-Velocity Model

Kolluru Venkata Kiran,1, ∗ Anupam Gupta,2, † Akhilesh Kumar Verma,3, ‡ and Rahul Pandit4, § Centre for Condensed Matter Theory, Department of Physics, Indian Institute of Science, Bangalore, 560012,…

Active Turbulence

Active fluids exhibit spontaneous flows with complex spatiotemporal structure, which have been observed in bacterial suspensions, sperm cells, cytoskeletal suspensions, self-propelled colloids, and…

Cascade or not cascade? Energy transfer and elastic effects in active nematics

We numerically study the multi-scale properties of a 2d active gel to address the energy transfer mechanism. We find that activity is able to excite long-ranged distortions of the nematic pattern…
...