计算物理 ›› 2009, Vol. 26 ›› Issue (5): 719-724.

• 研究论文 • 上一篇    下一篇

空间分数阶导数“反常”扩散方程数值算法的比较

孙洪广1, 陈文1, 蔡行2   

  1. 1. 河海大学工程力学系, 软物质力学研究所, 江苏 南京 210098;
    2. 奥斯陆大学信息学系, Simula(国家)实验室, 挪威 奥斯陆
  • 收稿日期:2008-05-06 修回日期:2008-08-02 出版日期:2009-09-25 发布日期:2009-09-25
  • 作者简介:孙洪广(1982-),男,山东,博士生,从事计算力学研究.
  • 基金资助:
    中国-挪威合作启动项目(180423);教育部"新世纪优秀人才支持计划"(NCET-06-0480);科技部中国-斯洛文尼亚国际合作项目(7-22)资助项目

Comparative Study of Numerical Algorithms for "Anomalous" Diffusion Equation with Spatial Fractional Derivatives

SUN Hongguang1, CHEN Wen1, CAI Xing2   

  1. 1. Institute of Soft Matter Mechanics and Department of Engineering Mechanics, Hohai University, Nanjing 210098, China;
    2. Simula Research Laboratory and Department of Informatics, University of Oslo, Norway
  • Received:2008-05-06 Revised:2008-08-02 Online:2009-09-25 Published:2009-09-25

摘要: 分别采用显式差分格式、隐式差分格式以及Crank-Nicholson差分格式数值求解空间分数阶导数,并从局部截断误差、稳定性、计算量三个方面进行比较分析;通过数值算例验证分析结果.

关键词: 反常扩散, 空间分数阶导数, 有限差分格式, 稳定性

Abstract: We use explicit difference scheme,implicit difference scheme,and Crank-Nicholson difference scheme to discretize an anomalous diffusion equation with spatial fractional derivatives,and analyze their performances in terms of truncation error,stability and computing expense.A numerical example is examined to validate the results.

Key words: anomalous diffusion, spatial fractional derivative, finite difference scheme, stability

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