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Geometric control of active collective motion
Maxime Theillard1, Roberto Alonso-Matilla1, David Saintillan1
1Department of Mechanical and Aerospace Engineering, University of California San Diego, 9500 Gilman Drive, La Jolla CA 92093, USA. dstn@ucsd.edu.
Soft Matter
|December 2, 2016
Summary
Confinement influences active suspensions, creating vortices and pumping motions. This study explains these self-organization patterns in confined active matter using kinetic theory.
Area of Science:
- Physics
- Soft Matter Physics
- Fluid Dynamics
Background:
- Confinement significantly impacts self-organization in active suspensions.
- Experimental studies show vortex formation and pumping motions in confined active matter.
Purpose of the Study:
- To analyze the two-dimensional dynamics of confined active suspensions.
- To theoretically explain pattern formation and transitions in different geometries.
Main Methods:
- Utilized a mean-field kinetic theory.
- Coupled particle configuration conservation equations with forced Navier-Stokes equations.
- Employed linearized theory for quantitative predictions.
Main Results:
- Identified three distinct states in circular domains: equilibrium, stable vortex, and chaotic motion.
- Observed transitions from equilibrium to pumping, traveling waves, and chaos in racetracks.
- Results align with experimental observations.
Conclusions:
- Geometry plays a crucial role in the morphology and dynamics of active suspensions.
- Theoretical framework predicts and explains emergent patterns.
- Findings offer insights for controlling active collective motion in microfluidic devices.
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