计算物理 ›› 2000, Vol. 17 ›› Issue (S1): 187-192.DOI: 10.3969/j.issn.1001-246X.2000.01.031

• 论文 • 上一篇    下一篇

大气动力学方程组的半拉格朗日计算方案的数学研究

王必正1, 季仲贞1, 应祝明2   

  1. 1. LASG;中国科学院大气物理研究所, 北京 100029;
    2. 国家气象中心数控室, 北京 100081
  • 收稿日期:1999-04-20 修回日期:1999-07-28 出版日期:2000-12-25 发布日期:2000-12-25
  • 作者简介:王必正(1966~),男,浙江临海,助研,博士,从事大气动力学的研究
  • 基金资助:
    《国家重点基础研究发展规划》首批启动的"我国重大气候灾害的机理和预测理论研究"项目;国家自然科学基金资助项目(49805005、49975020和49735160)联合资助

MATHEMATICAL STUDY ABOUT SEMI-LAGRANGIAN SCHEME IN ATMOSPHERIC DYNAMICS EQUATIONS

WANG Bi-zheng1, JI Zhong-zhen1, YING Zhu-ming2   

  1. 1. LASG, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, 100029, P R China;
    2. The Division of NWP, National Meteorological Center, Beijing, 100081, P R China
  • Received:1999-04-20 Revised:1999-07-28 Online:2000-12-25 Published:2000-12-25

摘要: 通过对大气动力学方程组的半拉格朗日方案的数学分析,得出主要结论如下:(1)说明了Robert的半拉格朗日方案并不是绝对稳定的,通过特征线理论和双曲拟线性方程组解的理论,进一步说明了Robert理论的不正确。(2)通过分析右端项沿轨道积分,给出了一个关于半拉格朗日方案成立的判据,该判据与CLF相仿。(3)根据浅水方程特征理论,发现半拉格朗日方案应包括沿轨道反向积分(大气中慢过程)和沿特征锥积分(大气中快过程),而已有的方案仅含前一类。因此,今后有必要研究后一类的半拉格朗日方案并研究这两类过程之间的相互作用的计算问题。(4)即使研究沿轨道反向积分问题,其特征跟原方程组解直接有关,因此,不仅仅是一个常微分方程组的问题。而大气动力学方程组的经典解一般仅在小范围成立,并且一维、二维和三维间断均会出现,故大范围反向积分特征线一般是不可能的。

关键词: 半拉格朗日, 特征, 反向积分, 绝对稳定性

Abstract: By examining Semi-Lagrangian scheme in atmospheric dynamics,the main conclusions are obtained as follows.(1)The Semi-Lagrangian scheme by Robet is not of absolute stability.(2)The sufficient condition for computationally stability about Semi-Lagrangian scheme is obtained,which is similar with CFL condition.(3)According to characteristics of shallow-water equations,there are two kinds of characteristic surfaces:the stream lines(for slow process) and Monge cone (for fast process).However,the Semi-Lagrangian scheme only contains the first kind.Thus,the second kind and interaction between these kinds should be studied in the future.(4)As global classic solution in atmospheric dynamics equations does not exist generally,global backward integration is not carried out generally.

Key words: semi-Lagrangian scheme, characterististic, backward integration, absolute stability

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