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Title: Error analysis of a finite difference scheme for the epitaxial thin film model with slope selection with an improved convergence constant
Authors: Qiao, Z 
Wang, C
Wise, SM
Zhang, Z
Issue Date: 2017
Source: International journal of numerical analysis and modeling, 2017, v. 14, no. 2, p. 283-305
Abstract: In this paper we present an improved error analysis for a finite difference scheme for solving the 1-D epitaxial thin film model with slope selection. The unique solvability and unconditional energy stability are assured by the convex nature of the splitting scheme. A uniform-in-time Hm bound of the numerical solution is acquired through Sobolev estimates at a discrete level. It is observed that a standard error estimate, based on the discrete Gronwall inequality, leads to a convergence constant of the form exp(CTε−m), where m is a positive integer, and ε is the corner rounding width, which is much smaller than the domain size. To improve this error estimate, we employ a spectrum estimate for the linearized operator associated with the 1-D slope selection (SS) gradient flow. With the help of the aforementioned linearized spectrum estimate, we are able to derive a convergence analysis for the finite difference scheme, in which the convergence constant depends on ε−1 only in a polynomial order, rather than exponential.
Keywords: Convex splitting
Discrete Gronwall inequality
Epitaxial thin film growth
Finite difference
Linearized spectrum estimate
Uniform-in-time H stability m
Publisher: Institute for Scientific Computing and Information
Journal: International journal of numerical analysis and modeling 
ISSN: 1705-5105
EISSN: 1705-5105
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