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Controlling active turbulence by activity patterns.

Arghavan Partovifard1, Josua Grawitter1, Holger Stark1

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Researchers can control active turbulence in fluids by patterning activity. This study reveals novel multi-lane and trapped vortex states by creating specific patterns, offering new insights into fluid dynamics.

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Area of Science:

  • Soft Matter Physics
  • Fluid Dynamics
  • Active Matter

Background:

  • Active turbulence arises in systems with self-propelled particles, like active rods.
  • Controlling this turbulence is crucial for understanding and manipulating active fluid systems.
  • Doi's hydrodynamic equations model the behavior of semidilute solutions of active rods.

Purpose of the Study:

  • To investigate the control of active turbulence through spatial patterning of activity.
  • To identify and characterize novel flow states induced by specific activity patterns.
  • To analyze the parameter space governing the transition between different flow regimes.

Main Methods:

  • Linear stability analysis of Doi's hydrodynamic equations.
  • Characterization of active turbulence using energy spectra and power-law decay.
  • Numerical simulations of active fluids with patterned regions of switched-off activity.

Main Results:

  • Active turbulence emerges from an isotropic fluid above a critical pusher activity, exhibiting a characteristic energy spectrum.
  • Spatial patterning with a square lattice of inactive spots leads to distinct flow states, including multi-lane flow and trapped vortices.
  • The multi-lane flow state, characterized by alternating flow directions and vortex streets, occurs under specific conditions related to correlation and coherence lengths.

Conclusions:

  • Spatial patterning of activity provides an effective method to control active turbulence in fluid systems.
  • The study identifies novel flow states like multi-lane and trapped vortex patterns, expanding the understanding of active matter behavior.
  • These findings have implications for designing and manipulating active fluid systems with desired flow characteristics.