Author
Lewis, A
Aarts, D
Howell, P
Majumdar, A
Journal title
Studies in Applied Mathematics
DOI
10.1111/sapm.12161
Issue
4
Volume
138
Last updated
2022-08-01T08:32:46.687+01:00
Page
438-466
Abstract
We study planar nematic equilibria on a two-dimensional annulus with strong and weak tangent anchoring, in the Oseen–Frank theoretical framework. We analyse a radially invariant defect-free state and compute analytic stability criteria for this state in terms of the elastic anisotropy, annular aspect ratio, and anchoring strength. In the strong anchoring case, we define and characterize a new spiral-like equilibrium which emerges as the defect-free state loses stability. In the weak anchoring case, we compute stability diagrams that quantify the response of the defect-free state to radial and azimuthal perturbations. We study sector equilibria on sectors of an annulus, including the effects of weak anchoring and elastic anisotropy, giving novel insights into the correlation between preferred numbers of boundary defects and the geometry. We numerically demonstrate that these sector configurations can approximate experimentally observed equilibria with boundary defects.
Symplectic ID
666135
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Publication type
Journal Article
Publication date
01 Jan 2017
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