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A High-Efficient Algorithm for Parabolic Problems with Time-Dependent Coefficients

Part of: Acceleration of convergence Partial differential equations, boundary value problems Partial differential equations, initial value and time-dependent initial-boundary value problems

Published online by Cambridge University Press:  09 January 2017

Chuanmiao Chen ,
Xiangqi Wang  and
Hongling Hu
Chuanmiao Chen*
Affiliation:
College of Mathematics and Computer Science, Key Laboratory of High Performance Computing and Stochastic Information Processing, Hunan Normal University, Changsha, Hunan 410081, China
Xiangqi Wang*
Affiliation:
College of Mathematics and Computer Science, Key Laboratory of High Performance Computing and Stochastic Information Processing, Hunan Normal University, Changsha, Hunan 410081, China
Hongling Hu
Affiliation:
College of Mathematics and Computer Science, Key Laboratory of High Performance Computing and Stochastic Information Processing, Hunan Normal University, Changsha, Hunan 410081, China
*
*Corresponding author. Email:cmchen@hunnu.edu.cn (C. M. Chen), xiangqi.wang@foxmail.com (X. Q. Wang)
*Corresponding author. Email:cmchen@hunnu.edu.cn (C. M. Chen), xiangqi.wang@foxmail.com (X. Q. Wang)

Abstract

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A high-efficient algorithm to solve Crank-Nicolson scheme for variable coefficient parabolic problems is studied in this paper, which consists of the Function Time-Extrapolation Algorithm (FTEA) and Matrix Time-Extrapolation Algorithm (MTEA). First, FTEA takes a linear combination of previous l level solutions as good initial value of Un (see Time-extrapolation algorithm (TEA) for linear parabolic problems, J. Comput. Math., 32(2) (2014), pp. 183–194), so that Conjugate Gradient (CG)-iteration counts decrease to 1/3~1/4 of direct CG. Second, MTEA uses a linear combination of exact matrix values in level L, L+s, L+2s to predict matrix values in the following s–1 levels, and the coefficients of the linear combination is deduced by the quadric interpolation formula, then fully recalculate the matrix values at time level L+3s, and continue like this iteratively. Therefore, the number of computing the full matrix decreases by a factor 1/s. Last, the MTEA is analyzed in detail and the effectiveness of new method is verified by numerical experiments.

Keywords

Crank-Nicolson schemeTime-ExtrapolationCG-iterationvariable coefficient parabolic

MSC classification

Secondary: 65M06: Finite difference methods 65M12: Stability and convergence of numerical methods 65B05: Extrapolation to the limit, deferred corrections 65N22: Solution of discretized equations

Information

Type
Research Article
Information
Advances in Applied Mathematics and Mechanics , Volume 9 , Issue 2 , April 2017 , pp. 501 - 514
Copyright
Copyright © Global-Science Press 2017 

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