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Area of Science:

  • Fluid dynamics
  • Collective behavior
  • Biophysics

Background:

  • Animal groups like fish schools and bird flocks exhibit complex collective behaviors driven by interactions within generated flows.
  • Understanding how individual movements lead to emergent group locomotion is a key challenge in biophysics.

Purpose of the Study:

  • To investigate the role of flow-mediated interactions in the collective locomotion of multiple bodies.
  • To identify distinct modes of group movement and their underlying mechanisms.

Main Methods:

  • Experiments and simulations were conducted using arrays of flapping wings to study propulsion within a collective wake.
  • Mathematical modeling was employed to capture the memory effects of the flow field.

Main Results:

  • Distinct locomotion modes were observed, characterized by group swimming speed and spatial phase shifts between neighboring wings.
  • Coexistence of slow and fast modes was found, corresponding to constructive and destructive wing-wake interactions.
  • Group swimming demonstrated potential for enhanced speed and power savings.

Conclusions:

  • Fluid dynamic interactions alone are sufficient to generate coherent collective locomotion in groups.
  • The findings suggest a new framework for understanding the role of fluid flows in animal collective behaviors.
  • A mathematical model highlights the importance of flow field memory in collective movement.