CHINESE JOURNAL OF COMPUTATIONAL PHYSICS ›› 2020, Vol. 37 ›› Issue (3): 307-319.DOI: 10.19596/j.cnki.1001-246x.8042

• Research Reports • Previous Articles     Next Articles

High-order Fully Implicit Scheme and Multigrid Method for Two-dimensional Semilinear Diffusion Reaction Equations

ZHANG Lin, GE Yongbin   

  1. School of Mathematics and Statistics, Ningxia University, Yinchuan, Ningxia 750021, China
  • Received:2019-01-18 Revised:2019-05-28 Online:2020-05-25 Published:2020-05-25

Abstract: A finite difference method is used for high-order numerical solution of two-dimensional unsteady semilinear diffusion reaction equation. The spatial derivative term is discretized by a fourth-order compact difference formula, and the time derivative term is discretized by a fourth-order backward Euler formula. An unconditionally stable high-order five-level fully implicit scheme is proposed. Truncation error of the scheme is O(τ4+τ2h2+h4), that is, the time and space have fourth-order accuracy. In calculation of start-up steps, the first, second and third time levels are discretized by Crank-Nicolson method. Richardson extrapolation formula was used to extrapolate startup time accuracy to the fourth-order. A multigrid method based on the scheme is established, which accelerates convergence speed of the algebraic equations on each time level and improves computational efficiency. Finally, accuracy, stability and efficiency of the scheme and multigrid approach are verified with numerical experiments.

Key words: semilinear diffusion reaction equation, high-oder fully implicit scheme, compact scheme, multigrid method, Richardson extrapolation

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