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Multiparticle collision framework for active polar fluids.

Oleksandr Baziei1, Benjamín Loewe2, Tyler N Shendruk1

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Summary
This summary is machine-generated.

We developed a mesoscale simulation method for active polar fluids, crucial for understanding biological systems. This new approach captures flocking behavior and allows studying complex scenarios like external fields and obstacles.

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Area of Science:

  • Soft Matter Physics
  • Active Matter Simulations
  • Mesoscale Hydrodynamics

Background:

  • Dense active suspensions, common in biology, are modeled as active fluids with orientational symmetry.
  • Existing mesoscale simulations focus on active nematic fluids, while polar fluids lack comparable methods.
  • Simulating polar fluids requires mesoscale approaches for complex geometries and as suspension solvents.

Purpose of the Study:

  • To develop a mesoscale numerical approach for simulating polar active fluids.
  • To adapt the multiparticle collision dynamics (MPCD) framework for active polar systems.
  • To investigate the behavior of active polar fluids under various conditions.

Main Methods:

  • Applied the coarse-graining multiparticle collision dynamics (MPCD) framework.
  • Developed three active-polar MPCD (AP-MPCD) variants based on the Vicsek model.
  • Incorporated Andersen and Langevin thermostats for particle speed relaxation.

Main Results:

  • Each AP-MPCD variant demonstrated a flocking transition at critical activity.
  • Observed banding phenomena near the flocking transition point.
  • Explored flocking under external fields (destroying banding) and anisotropic obstacles (biasing direction).

Conclusions:

  • The AP-MPCD method effectively captures known polar active suspension phenomenology.
  • Demonstrated the versatility of AP-MPCD for studying active polar fluids in complex scenarios.
  • Provides a valuable tool for simulating active polar fluids in biological and soft matter systems.