计算物理 ›› 1993, Vol. 10 ›› Issue (1): 62-68.

• 论文 • 上一篇    下一篇

解对流扩散方程的四阶耗散的单侧逼近指数型格式

陆君安, 杨屹松   

  1. 武汉水利电力学院, 武汉 430072
  • 收稿日期:1991-09-02 修回日期:1992-04-01 出版日期:1993-03-25 发布日期:1993-03-25

A FOURTH-ORDER DISSIPATION EXPONENT-TYPE SCHEME OF ONE-SIDED APPROXIMATION FOR SOLVING CONVECTIVE DIFFUSION EQUATIONS

Lu Junan, Yang Yisong   

  1. Wuhan University of Hydraulic and Electric Engineering, Wuhan 430072
  • Received:1991-09-02 Revised:1992-04-01 Online:1993-03-25 Published:1993-03-25

摘要: 本文构造了一种带权的六点格式,讨论了它的稳定性条件,证明了这种格式的解对微分方程的真解具有单侧逼近的性质;当适当选取权数θ=θ0时,这种格式是一种四阶耗散格式,不仅数值耗散很小,而且满足稳定性条件,不出现非物理振荡;还证明了C.J.Chen的有限分析格式[1]在一定条件下是这种带权格式的一个特殊情形,因此也具有单侧逼近性质;最后给出了几个算例说明上述性质。

关键词: 单侧逼近, 耗散

Abstract: In this paper a fourth-oder dissipation exponent-type scheme of one-sided approximation for solving convective diffusion equations is derived. The theoretical results on the stability and the properties of one-sided approximation and fourth-oder dissipation of this scheme have been presented. The relations of this scheme and finite analytic method is also obtained. Some numerical examples are qiven.

Key words: one-sided approximation, dissipation, finite analytic method