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Convergence of a fully discrete finite element method for a degenerate parabolic system modelling nematic liquid crystals with variable degree of orientation

by J. W. Barrett and X. Feng and A. Prohl

(Report number 2005-04)

Abstract
We consider a degenerate parabolic system which models the evolution of nematic liquid crystal with variable degree of orientation. The system is a slight modification to that proposed in [2], which is a special case of Ericksen's general continuum model in [5]. We prove the global existence of weak solutions by passing to the limit in a regularized system. Moreover, we propose a practical fully discrete finite element method for this regularized system, and we establish the (subsequence) convergence of this finite element approximation to the solution of the regularized system as the mesh parameters tend to zero; and to a solution of the original degenerate parabolic system when the mesh and regularization parameters all approach zero. Finally, numerical experiments are included which show the formation, annihilation and evolution of line singularities/defects in such models.

Keywords: Nematic liquid crystal, Degenerate parabolic system, Existence, Finite element method, Convergence, fully discrete scheme

@Techreport{BFP05_343,
  author = {J. W. Barrett and X. Feng and A. Prohl},
  title = {Convergence of a fully discrete finite element method for a degenerate parabolic system modelling nematic liquid crystals with variable degree of orientation},
  institution = {Seminar for Applied Mathematics, ETH Z{\"u}rich},
  number = {2005-04},
  address = {Switzerland},
  url = {https://www.sam.math.ethz.ch/sam_reports/reports_final/reports2005/2005-04.pdf },
  year = {2005}
}

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