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An Analog Macroscopic Technique for Studying Molecular Hydrodynamic Processes in Dense Gases and Liquids

An Analog Macroscopic Technique for Studying Molecular Hydrodynamic Processes in Dense Gases and Liquids

Published on: December 4, 2017

Dynamical density functional theory for microswimmers.

Andreas M Menzel¹, Arnab Saha¹, Christian Hoell¹

¹Institut für Theoretische Physik II, Weiche Materie, Heinrich-Heine-Universität Düsseldorf, 40225 Düsseldorf, Germany.

The Journal of Chemical Physics

|January 17, 2016

Summary

This summary is machine-generated.

We developed a new dynamical density functional theory (DDFT) for active microswimmer suspensions, accounting for hydrodynamic interactions and self-propulsion. This model reveals a novel hydrodynamic pumping state and its instability.

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Area of Science:

Soft Matter Physics
Fluid Dynamics
Statistical Mechanics

Background:

Dynamical density functional theory (DDFT) previously modeled passive colloidal suspensions and active dry particle systems.
Existing DDFT models did not fully capture the complex hydrodynamic interactions in active microswimmer suspensions.

Purpose of the Study:

To establish a unified DDFT framework for active microswimmer suspensions.
To investigate the emergent behaviors and hydrodynamic interactions in these systems.
To explore phenomena like symmetry breaking and hydrodynamic pumping.

Main Methods:

Derivation of a DDFT from statistical mechanics principles.
Introduction of minimal model microswimmers with self-propulsion and hydrodynamic interactions.
Simulation and analysis of microswimmer suspensions confined in a trapping potential.

Main Results:

Successful establishment of a DDFT for active microswimmers, incorporating passive and active hydrodynamic interactions.
Observation of rotational symmetry breaking and formation of a hydrodynamic pumping state.
Discovery of an instability within the hydrodynamic pumping state.

Conclusions:

The developed DDFT provides a powerful tool for studying active microswimmer systems.
The findings shed light on the complex collective behaviors driven by hydrodynamics.
The study uncovers new dynamic instabilities in active matter systems.