计算物理 ›› 2007, Vol. 24 ›› Issue (2): 127-133.

• 论文 •    下一篇

二维三温热传导方程求解中的非线性迭代初值选取

安恒斌1, 莫则尧2, 徐小文3   

  1. 1. 北京应用物理与计算数学研究所计算物理实验室, 北京 100088;
    2. 北京应用物理与计算数字研究所高性能计算中心, 北京 100088;
    3. 中国工程物理研究院研究生部, 北京 100088
  • 收稿日期:2005-11-02 修回日期:2006-03-23 出版日期:2007-03-25 发布日期:2007-03-25
  • 作者简介:安恒斌(1974-),男,宁夏彭阳,博士后,主要从事大规模非线性方程组迭代解法方面的研究,北京8009信箱17分箱100088.
  • 基金资助:
    中国博士后科学基金(2005037005);国家杰出青年科学基金(60425205);国家973项目(2005CB321702);国家自然科学重点基金(60533020);国家自然科学基金(10571017)资助项目

Nonlinear Initial Values in the Iterative Solution of 2-D 3-T Heat Conduct Equations

AN Hengbin1, MO Zeyao2, XU Xiaowen3   

  1. 1. Laboratory of Computational Physics, Institute of Applied Physics and Computational Mathematics, Bering 100088, China;
    2. High Performace Computing Center, Institute of Applied Physics and Computational Mathematics, Beijing 100088, China;
    3. Graduate School of China Academy of Engineering Physics, Belting 100088, China
  • Received:2005-11-02 Revised:2006-03-23 Online:2007-03-25 Published:2007-03-25

摘要: 由于二维三温热传导方程具有很强的非线性特性,因此采用全隐格式对该方程离散后,所得非线性代数方程组的求解将变得非常困难.针对二维三温热传导方程离散所得非线性代数方程组的迭代求解,提出了一种有效的选取初值的方法.对两种不同性质的介质进行数值实验,结果表明,所设计的初值选取方法不仅大大提高了计算效率,而且能够降低非线性解法器对时间步长的影响.

关键词: 三温热传导方程, 非线性方程组, 非精确Newton法, 迭代初值

Abstract: As 2-D 3-T heat conduct equations are discretized in a fully implicit method,it is very difficult to solve the nonlinear algebraic equations obtained due to strong nonlinearity.Efficient initial guesses for iterative solutions of discretized nonlinear algebraic equations are presented.Numerical results for two media with different properties show that the proposed initial guesses improve computational efficiency and reduce the influence of nonlinear solver on the time step as well.

Key words: 3-T heat conduct equation, nonlinear equation, inexact Newton method, iterative initial value

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