Error analysis of Nitsche's and discontinuous Galerkin methods of a reduced Landau-de Gennes problem

Maity, Ruma Rani and Majumdar, Apala and Nataraj, Neela (2020) Error analysis of Nitsche's and discontinuous Galerkin methods of a reduced Landau-de Gennes problem. Computational Methods in Applied Mathematics, 21 (1). 179–209. ISSN 1609-9389 (https://doi.org/10.1515/cmam-2020-0185)

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Abstract

We study a system of semi-linear elliptic partial differential equations with a lower order cubic nonlinear term, and inhomogeneous Dirichlet boundary conditions, relevant for two-dimensional bistable liquid crystal devices, within a reduced Landau–de Gennes framework. The main results are (i) a priori error estimates for the energy norm, within the Nitsche’s and discontinuous Galerkin frameworks under milder regularity assumptions on the exact solution and (ii) a reliable and efficient a posteriori analysis for a sufficiently large penalization parameter and a sufficiently fine triangulation in both cases. Numerical examples that validate the theoretical results, are presented separately.