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Hydrodynamic bend instabilities in active particle suspensions can arise without dipolar stresses, driven solely by self-propulsion forces. This finding offers new insights into active matter dynamics and instability development.

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Area of Science:

  • Soft Matter Physics
  • Active Matter Physics
  • Fluid Dynamics

Background:

  • Hydrodynamic bend instabilities are common in active particle systems.
  • These instabilities are typically attributed to dipolar active stresses from self-propelled particles.
  • Understanding instability origins is key for active matter applications.

Purpose of the Study:

  • To investigate the emergence of hydrodynamic bend instabilities.
  • To determine if instabilities can occur without dipolar active stress.
  • To explore the role of self-propulsion in polar active units.

Main Methods:

  • Linear stability analyses were employed.
  • Numerical simulations were conducted.
  • Analytical derivations were performed.

Main Results:

  • A hydrodynamic bend instability was shown to emerge solely from self-propulsion forces in polar active units.
  • A uniformly ordered state develops instability above a critical self-propulsion force.
  • Increased self-propulsion leads to a disorderly flow state.

Conclusions:

  • Hydrodynamic bend instabilities can be driven by self-propulsion alone, without dipolar stresses.
  • This provides a new mechanism for instability in 2D self-propelled materials on substrates.
  • The findings have implications for biological cell layers and synthetic active materials.