https://doi.org/10.1051/epjconf/202023302001
Lattice-Boltzmann simulation of free nematic-isotropic interfaces
1 Centro de Física Teórica e Computacional, Faculdade de Ciências, Universidade de Lisboa, P-1749-016 Lisboa, Portugal
2 Departamento de Física, Faculdade de Ciências, Universidade de Lisboa, P-1749-016 Lisboa, Portugal
* Corresponding author: rcvcoelho@fc.ul.pt
Published online: 16 April 2020
We use a hybrid method of lattice Boltzmann and finite differences to simulate flat and curved interfaces between the nematic and isotropic phases of a liquid crystal described by the Landau-de Gennes theory. For the flat in¬terface, we measure the interfacial velocity at different temperatures around the coexistence. We show that the interface is completely static at the coexistence temperature and that the profile width is in line with the theoretical predictions. The interface is stable in a range of temperatures around coexistence and dis¬appears when one of the two phases becomes mechanically unstable. We stabi¬lize circular nematic domains by a shift in temperature, related to the Laplace pressure, and estimate the spurious velocities of these lattice Boltzmann simu¬lations.
© The Authors, published by EDP Sciences, 2020
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