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Title: Analysis of the quasicontinuum method and its application
Author: Wang, Hao
ISNI:       0000 0004 2747 0184
Awarding Body: University of Oxford
Current Institution: University of Oxford
Date of Award: 2013
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The present thesis is on the error estimates of different energy based quasicontinuum (QC) methods, which are a class of computational methods for the coupling of atomistic and continuum models for micro- or nano-scale materials. The thesis consists of two parts. The first part considers the a priori error estimates of three energy based QC methods. The second part deals with the a posteriori error estimates of a specific energy based QC method which was recently developed. In the first part, we develop a unified framework for the a priori error estimates and present a new and simpler proof based on negative-norm estimates, which essentially extends previous results. In the second part, we establish the a posteriori error estimates for the newly developed energy based QC method for an energy norm and for the total energy. The analysis is based on a posteriori residual and stability estimates. Adaptive mesh refinement algorithms based on these error estimators are formulated. In both parts, numerical experiments are presented to illustrate the results of our analysis and indicate the optimal convergence rates. The thesis is accompanied by a thorough introduction to the development of the QC methods and its numerical analysis, as well as an outlook of the future work in the conclusion.
Supervisor: Suli, Endre; Ortner, Christoph Sponsor: China Scholarship Council
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available
Keywords: Numerical analysis ; Mechanics of deformable solids (mathematics) ; Mechanics of particles and systems (mathematics) ; Partial differential equations ; Quasicontinuum method; atomistic/continuum coupling; coarse-graining; a priori error analysis; a posteriori error analysis