Instabilities and topological defects in active nematics

Thampi, S. P.; Golestanian, Ramin; Yeomans, J. M.

doi:10.1209/0295-5075/105/18001

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Instabilities and topological defects in active nematics

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Golestanian, Ramin
Department of Living Matter Physics, Max Planck Institute for Dynamics and Self-Organization, Max Planck Society;

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Thampi, S. P., Golestanian, R., & Yeomans, J. M. (2014). Instabilities and topological defects in active nematics. EPL, 105(1): 18001. doi:10.1209/0295-5075/105/18001.

Cite as: https://hdl.handle.net/21.11116/0000-0001-770F-A

Abstract

We study a continuum model of an extensile active nematic to show that mesoscale turbulence develops in two stages: i) ordered regions undergo an intrinsic hydrodynamic instability generating walls, lines of strong bend deformations; ii) the walls relax by forming oppositely charged pairs of defects. Both creation and annihilation of defect pairs reinstate nematic regions which undergo further instabilities, leading to a dynamic steady state. We compare this with the development of active turbulence in a contractile active nematic. © Copyright EPLA, 2013.