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Active nematics with anisotropic friction: the decisive role of the flow aligning parameter

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Abstract

We use continuum simulations to study the impact of anisotropic hydrodynamic friction on the emergent flows of active nematics. We show that, depending on whether the active particles align with or tumble in their collectively self-induced flows, anisotropic friction can result in markedly different patterns of motion. In a flow-aligning regime and at high anisotropic friction, the otherwise chaotic flows are streamlined into flow lanes with alternating directions, reproducing the experimental laning state that has been obtained by interfacing microtubule–motor protein mixtures with smectic liquid crystals. Within a flow-tumbling regime, however, we find that no such laning state is possible. Instead, the synergistic effects of friction anisotropy and flow tumbling can lead to the emergence of bound pairs of topological defects that align at an angle to the easy flow direction and navigate together throughout the domain. In addition to confirming the mechanism behind the laning states observed in experiments, our findings emphasise the role of the flow aligning parameter in the dynamics of active nematics.

Graphical abstract: Active nematics with anisotropic friction: the decisive role of the flow aligning parameter

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Article information


Submitted
30 Sep 2019
Accepted
22 Jan 2020
First published
24 Jan 2020

Soft Matter, 2020, Advance Article
Article type
Paper

Active nematics with anisotropic friction: the decisive role of the flow aligning parameter

K. Thijssen, L. Metselaar, J. M. Yeomans and A. Doostmohammadi, Soft Matter, 2020, Advance Article , DOI: 10.1039/C9SM01963D

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