We study reduced nematic equilibria on regular two-dimensional polygons with Dirichlet tangent boundary conditions in a reduced two-dimensional Landau--de Gennes framework, discussing their relevance in the full three-dimensional framework too. We work at a fixed temperature and study the reduced stable equilibria in terms of the edge length, $\lambda$, of the regular polygon, $E_K$, with $K$ edges. We analytically compute a novel “ring solution” in the $\lambda \to 0$ limit, with a unique point defect at the center of the polygon for $K \neq 4$. The ring solution is unique. For sufficiently large $\lambda$, we deduce the existence of at least $[K/2 ]$ classes of stable equilibria and numerically compute bifurcation diagrams for reduced equilibria on a pentagon and hexagon, as a function of $\lambda^2$, thus illustrating the effects of geometry on the structure, locations, and dimensionality of defects in this framework.
|Number of pages||26|
|Journal||SIAM Journal of Applied Mathematics|
|Early online date||16 Jul 2020|
|Publication status||E-pub ahead of print - 16 Jul 2020|
- reduced nematic equilibria
- two-dimensional polygons
- Dirichlet tangent boundary conditions