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  Maximum in density heterogeneities of active swimmers

Schwarzendahl, F. J., & Mazza, M. G. (2018). Maximum in density heterogeneities of active swimmers. Soft Matter, 14(23), 4666-4678. doi:10.1039/c7sm02301d.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0001-3E3C-8 Version Permalink: http://hdl.handle.net/21.11116/0000-0001-79BE-2
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: Suspensions of unicellular microswimmers such as flagellated bacteria or motile algae can exhibit spontaneous density heterogeneities at large enough concentrations. We introduce a novel model for biological microswimmers that creates the flow field of the corresponding microswimmers, and takes into account the shape anisotropy of the swimmer's body and stroke-averaged flagella. By employing multiparticle collision dynamics, we directly couple the swimmer's dynamics to the fluid's. We characterize the nonequilibrium phase diagram, as the filling fraction and Péclet number are varied, and find density heterogeneities in the distribution of both pullers and pushers, due to hydrodynamic instabilities. We find a maximum degree of clustering at intermediate filling fractions and at large Péclet numbers resulting from a competition of hydrodynamic and steric interactions between the swimmers. We develop an analytical theory that supports these results. This maximum might represent an optimum for the microorganisms' colonization of their environment.

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Language(s): eng - English
 Dates: 2018-05-022018-06-21
 Publication Status: Published in print
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 Rev. Method: Peer
 Identifiers: DOI: 10.1039/c7sm02301d
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Title: Soft Matter
Source Genre: Journal
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Pages: - Volume / Issue: 14 (23) Sequence Number: - Start / End Page: 4666 - 4678 Identifier: -