Thesis
Mathematical modelling of active nematic liquid crystals in confined regions
- Creator
- Rights statement
- Awarding institution
- University of Strathclyde
- Date of award
- 2020
- Thesis identifier
- T15520
- Person Identifier (Local)
- 201575501
- Qualification Level
- Qualification Name
- Department, School or Faculty
- Abstract
- This thesis focusses on the application of continuum theories and modelling techniques of liquid crystalline fluids to the area of anisotropy and self-organisation derived from active agents. The research involves a continuum description of anisotropic active fluids, using adapted forms of continuum hydrodynamic theories of liquid crystals.;We first consider the director structures of inactive nematic liquid crystals confined in rectangular regions. We use a mixture of analytical and numerical calculations to examine the energies of non-trivial nematic equilibria which exchange stabilities with constant equilibria at critical anchoring strengths. For the remainder of the thesis, we consider active nematic liquid crystals in confined regions.;We first use an adapted Ericksen-Leslie theory to investigate spontaneous flow transitions of active nematics, with the liquid crystal confined in a one-dimensional shallow channel. We examine how internally generated flows induced by activity are affected by externally induced flows due to, pressure gradients and external orienting fields. We then investigate a shallow channel of active nematic in terms of an adapted Q-tensor theory for uniaxial nematic liquid crystals.;Such a model allows for an investigation into the effects of variable ordering caused by changes in the temperature. Finally, we investigate active nematics confined in two-dimensional regions. We first consider wedge geometries containing an active nematic with a singularity at the wedge corner, deriving analytic solutions of a simplified version of the Ericksen-Leslie equations. We then employ numerical calculations to find steady solutions of the full non-linear Ericksen-Leslie equations for active nematics confined in rectangular regions.
- Advisor / supervisor
- McKay, Geoff
- Mottram, Nigel
- Resource Type
- DOI
- Date Created
- 2020
- Former identifier
- 9912787793302996
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