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Alignment of Nonspherical Active Particles in Chaotic Flows.

M Borgnino1, K Gustavsson2, F De Lillo1

  • 1Dipartimento di Fisica and INFN, Università di Torino, via P. Giuria 1, 10125 Torino, Italy.

Physical Review Letters
|November 8, 2019
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Summary
This summary is machine-generated.

Rodlike microswimmers align with turbulent flow due to swimming and shape. This robust effect, independent of flow changes, is key for understanding aquatic ecosystems.

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Area of Science:

  • Fluid dynamics
  • Biophysics
  • Statistical mechanics

Background:

  • Microswimmers are crucial in aquatic ecosystems.
  • Understanding their orientation in turbulent flows is challenging.
  • Particle shape significantly influences microswimmer behavior.

Purpose of the Study:

  • Investigate orientation statistics of microswimmers in chaotic flows.
  • Determine the mechanism behind preferential alignment of rodlike particles.
  • Explore the ecological relevance of observed phenomena.

Main Methods:

  • Numerical simulations of microswimmers in turbulent flows.
  • Statistical modeling using perturbation theory.
  • Analysis of fluid velocity and gradient correlations.

Main Results:

  • Rodlike microswimmers preferentially align with flow velocity.
  • Alignment is driven by velocity/gradient correlations and fore-aft symmetry breaking.
  • The effect is a robust kinematic phenomenon, independent of flow evolution.

Conclusions:

  • Microswimmer orientation in turbulence is governed by intrinsic properties and flow interactions.
  • The discovered alignment mechanism has implications for aquatic ecology.
  • Further research can explore diverse microswimmer shapes and flow conditions.