A priori and a posteriori error analysis for semilinear problems in liquid crystals

In this paper, we develop a unified framework for the a priori and a posteriori error control of different lowest-order finite element methods for approximating the regular solutions of systems of partial differential equations under a set of hypotheses. The systems involve cubic nonlinearities in l...

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Bibliographic Details
Published in:ESAIM. Mathematical modelling and numerical analysis 2023-11, Vol.57 (6), p.3201
Main Authors: Maity, Ruma Rani, Majumdar, Apala, Nataraj, Neela
Format: Article
Language:English
Subjects:
Approximation
Boundary conditions
Dirichlet problem
Error analysis
Estimates
Exact solutions
Existence theorems
Finite element method
Hilbert space
Hypotheses
Liquid crystals
Mathematics
Methods
Nematic crystals
Partial differential equations
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Summary:In this paper, we develop a unified framework for the a priori and a posteriori error control of different lowest-order finite element methods for approximating the regular solutions of systems of partial differential equations under a set of hypotheses. The systems involve cubic nonlinearities in lower order terms, non-homogeneous Dirichlet boundary conditions, and the results are established under minimal regularity assumptions on the exact solution. The key contributions include (i) results for existence and local uniqueness of the discrete solutions using Newton–Kantorovich theorem, (ii) a priori error estimates in the energy norm, and (iii) a posteriori error estimates that steer the adaptive refinement process. The results are applied to conforming, Nitsche, discontinuous Galerkin, and weakly over penalized symmetric interior penalty schemes for variational models of ferronematics and nematic liquid crystals. The theoretical estimates are corroborated by substantive numerical results.
ISSN:1290-3841
DOI:10.1051/m2an/2023056