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Onset of Intermittency and Multiscaling in Active Turbulence.

Kolluru Venkata Kiran1, Kunal Kumar2, Anupam Gupta3

  • 1Indian Institute of Science, Centre for Condensed Matter Theory, Department of Physics, Bengaluru 560012, India.

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Living fluids exhibit chaotic states similar to turbulent flows. This study demonstrates how bacterial activity induces intermittency and multiscaling in fluid dynamics, bridging low and high Reynolds number regimes.

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Area of Science:

  • Fluid dynamics
  • Biophysics
  • Nonlinear dynamics

Background:

  • Living fluids can exhibit complex, nonequilibrium behaviors.
  • High Reynolds number flows are characterized by inertial turbulence.
  • Connections between biological activity and fluid turbulence are actively explored.

Purpose of the Study:

  • To investigate the emergence of intermittency and multiscaling in living fluid systems.
  • To model the influence of bacterial activity on fluid dynamics.
  • To bridge the understanding between low and high Reynolds number flow phenomena.

Main Methods:

  • Utilized a hydrodynamical model to simulate fluid behavior.
  • Analyzed Eulerian and Lagrangian structure functions.
  • Varied bacterial activity as a key parameter.

Main Results:

  • Observed the onset of intermittency as a function of bacterial activity.
  • Demonstrated multiscaling in both Eulerian and Lagrangian structure functions.
  • Established a link between biological activity and turbulent flow characteristics.

Conclusions:

  • Bacterial activity can induce intermittency and multiscaling in fluid flows.
  • This work connects low and high Reynolds number flow physics.
  • Provides new insights into the mechanisms driving flow intermittency.