Flow around topological defects in active nematic films
We study the active flow around isolated defects and the self-propulsion velocity of defects in an active nematic film with both viscous dissipation (with viscosity ) and frictional damping with a substrate. The interplay between these two dissipation mechanisms is controlled by the hydrodynamic dis...
Gespeichert in:
Veröffentlicht in: | Proceedings of the Royal Society. A, Mathematical, physical, and engineering sciences Mathematical, physical, and engineering sciences, 2022, Vol.478 (2257), p.20210879-20210879 |
---|---|
Hauptverfasser: | , , , |
Format: | Artikel |
Sprache: | eng |
Online-Zugang: | Volltext |
Tags: |
Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
|
Zusammenfassung: | We study the active flow around isolated defects and the self-propulsion velocity of
defects in an active nematic film with both viscous dissipation (with viscosity
) and frictional damping
with a substrate. The interplay between these two dissipation mechanisms is controlled by the hydrodynamic dissipation length
that screens the flows. For an isolated defect, in the absence of screening from other defects, the size of the shear vorticity around the defect is controlled by the system size
. In the presence of friction that leads to a finite value of
, the vorticity field decays to zero on the lengthscales larger than
. We show that the self-propulsion velocity of
defects grows with
in small systems where
, while in the infinite system limit or when
, it approaches a constant value determined by
. |
---|---|
ISSN: | 1364-5021 1471-2946 |
DOI: | 10.1098/rspa.2021.0879 |