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  Hydrodynamic interactions dominate the structure of active swimmers’ pair distribution functions

Schwarzendahl, F. J., & Mazza, M. G. (2019). Hydrodynamic interactions dominate the structure of active swimmers’ pair distribution functions. The Journal of Chemical Physics, 150(18): 184902. doi:10.1063/1.5085755.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0003-9B49-D Version Permalink: http://hdl.handle.net/21.11116/0000-0003-A029-A
Genre: Journal Article

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 Creators:
Schwarzendahl, Fabian Jan1, Author              
Mazza, Marco G.1, Author              
Affiliations:
1Group Non-equilibrium soft matter, Department of Dynamics of Complex Fluids, Max Planck Institute for Dynamics and Self-Organization, Max Planck Society, ou_2063308              

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 Abstract: Microswimmers often exhibit surprising patterns due to the nonequilibrium nature of their dynamics. Collectively, suspensions of microswimmers appear as a liquid whose properties set it apart from its passive counterpart. To understand the impact of hydrodynamic interactions on the basic statistical features of a microswimmer’s liquid, we investigate its structure by means of the pair distribution function. We perform particle-based simulations of microswimmers that include steric effects, shape anisotropy, and hydrodynamic interactions. We find that hydrodynamic interactions considerably alter the orientation-dependent pair distribution function compared to purely excluded volume models like active Brownian particles and generally decrease the structure of the liquid. Depletion regions are dominant at lower filling fractions, while at larger filling fraction, the microswimmer liquid develops a stronger first shell of neighbors in specific directions, while losing structure at larger distances. Our work is a first step toward a statistico-mechanical treatment of the structure of microswimmer suspensions.

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Language(s): eng - English
 Dates: 2019-05-102019
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.1063/1.5085755
 Degree: -

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Title: The Journal of Chemical Physics
Source Genre: Journal
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Publ. Info: Woodbury, N.Y. : American Institute of Physics
Pages: 7 Volume / Issue: 150 (18) Sequence Number: 184902 Start / End Page: - Identifier: ISSN: 0021-9606
CoNE: https://pure.mpg.de/cone/journals/resource/954922836226