计算物理 ›› 2020, Vol. 37 ›› Issue (1): 26-36.DOI: 10.19596/j.cnki.1001-246x.8003

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标量波传播问题的双互易精细积分法

周枫林1,2, 王炜佳1, 廖海洋1, 李光1   

  1. 1. 湖南工业大学机械工程学院, 湖南 株洲 412007;
    2. 湖南大学机械与运载工程学院, 湖南 长沙 410082
  • 收稿日期:2018-11-12 修回日期:2018-12-26 出版日期:2020-01-25 发布日期:2020-01-25
  • 通讯作者: 李光(1963-),男,博士,教授,研究方向为工程数值方法,E-mail:liguanguw@126.com
  • 作者简介:周枫林(1986-),男,博士,副教授,研究方向为工程数值方法,E-mail:edwal0zhou@163.com
  • 基金资助:
    国家自然科学基金(11602082)及湖南省教育厅资助科研项目(19B145)及株洲市科技计划资助项目

A Time Domain Dual Reciprocity Precise Integration Method for Scalar Wave Propagation Problems

ZHOU Fenglin1,2, WANG Weijia1, LIAO Haiyang1, LI Guang1   

  1. 1. College of Mechanical Engineering, Hunan University of Technology, Zhuzhou, Hunan 412007, China;
    2. College of Mechanical and Vehicle Engineering, Hunan University, Changsha, Hunan 410082, China
  • Received:2018-11-12 Revised:2018-12-26 Online:2020-01-25 Published:2020-01-25

摘要: 为避免使用计算多种特征频率下的声场响应,采用双互易方法将边界积分方程中时间二次导数项的域积分转化为边界积分.首先,将计算场点配置在边界上并考虑边界条件,可以获得由内部节点上声压量线性表示的边界节点上的物理量;其次,将计算场点配置于域内离散节点上,将所得边界积分方程组中关于边界物理量用内部节点的声压量线性表示,获得关于声压量的二阶常微分方程组;第三,引入声压变化速度作为未知量,将二阶常微分方程组转化为一阶常微分方程组;最后,采用精细积分法精确求解常微分方程组.数值算例验证了双互易精细积分法的正确性和稳定性.

关键词: 标量波传播, 边界积分方程, 双互易方法, 精细积分

Abstract: To avoid computation of multi-frequencies pressure in solution of frequency method, a dual reciprocity method (DRM) is applied to convert domain integral, which is related to derivatives of pressure over time, in boundary integral equation into boundary integral. Firstly, field points are collocated at all boundary nodes. With boundary condition, boundary quantities at boundary nodes can be represented linearly by quantities at domain nodes, which are applied for radial basis function interpolation and are arbitrarily distributed in DRM. Secondly, field points are further collocated at domain nodes. A system of ordinary differential equations (ODEs) of the second order is obtained. Thirdly, variation rate of pressure was introduced as an unknown quantity to reduce order of resulted ODEs. Finally, a precise integration method is adopted to solved the first ordered ODEs. Numerical examples demonstrated validity and stability of the method.

Key words: scalar wave propagation, boundary integral equation, dual reciprocity method, precise integration method

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