Communications on Applied Mathematics and Computation ›› 2020, Vol. 2 ›› Issue (4): 613-640.doi: 10.1007/s42967-019-00058-1

• ORIGINAL PAPER • 上一篇    

High-Order Local Discontinuous Galerkin Algorithm with Time Second-Order Schemes for the Two-Dimensional Nonlinear Fractional Difusion Equation

Min Zhang1, Yang Liu2, Hong Li2   

  1. 1 School of Mathematical Sciences, Xiamen University, Xiamen 361005, Fujian Province, China;
    2 School of Mathematical Sciences, Inner Mongolia University, Hohhot 010021, China
  • 收稿日期:2019-10-21 修回日期:2019-12-09 发布日期:2020-09-11
  • 通讯作者: Yang Liu E-mail:mathliuyang@imu.edu.cn
  • 基金资助:
    This work is supported by the National Natural Science Foundation of China (11661058, 11761053), the Natural Science Foundation of Inner Mongolia (2017MS0107), and the Program for Young Talents of Science and Technology in Universities of Inner Mongolia Autonomous Region (NJYT-17-A07).

High-Order Local Discontinuous Galerkin Algorithm with Time Second-Order Schemes for the Two-Dimensional Nonlinear Fractional Difusion Equation

Min Zhang1, Yang Liu2, Hong Li2   

  1. 1 School of Mathematical Sciences, Xiamen University, Xiamen 361005, Fujian Province, China;
    2 School of Mathematical Sciences, Inner Mongolia University, Hohhot 010021, China
  • Received:2019-10-21 Revised:2019-12-09 Published:2020-09-11
  • Contact: Yang Liu E-mail:mathliuyang@imu.edu.cn
  • Supported by:
    This work is supported by the National Natural Science Foundation of China (11661058, 11761053), the Natural Science Foundation of Inner Mongolia (2017MS0107), and the Program for Young Talents of Science and Technology in Universities of Inner Mongolia Autonomous Region (NJYT-17-A07).

摘要: In this article, some high-order local discontinuous Galerkin (LDG) schemes based on some second-order θ approximation formulas in time are presented to solve a two-dimensional nonlinear fractional difusion equation. The unconditional stability of the LDG scheme is proved, and an a priori error estimate with O(hk+1 + △t2) is derived, where k ≥ 0 denotes the index of the basis function. Extensive numerical results with Qk(k=0, 1, 2, 3) elements are provided to confrm our theoretical results, which also show that the secondorder convergence rate in time is not impacted by the changed parameter θ.

关键词: Two-dimensional nonlinear fractional difusion equation, High-order LDG method, Second-order θ scheme, Stability and error estimate

Abstract: In this article, some high-order local discontinuous Galerkin (LDG) schemes based on some second-order θ approximation formulas in time are presented to solve a two-dimensional nonlinear fractional difusion equation. The unconditional stability of the LDG scheme is proved, and an a priori error estimate with O(hk+1 + △t2) is derived, where k ≥ 0 denotes the index of the basis function. Extensive numerical results with Qk(k=0, 1, 2, 3) elements are provided to confrm our theoretical results, which also show that the secondorder convergence rate in time is not impacted by the changed parameter θ.

Key words: Two-dimensional nonlinear fractional difusion equation, High-order LDG method, Second-order θ scheme, Stability and error estimate

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