IMECH-IR  > 环境力学重点实验室(2009-2011)
 波动数值模拟中的吸收边界条件 Alternative Title ABSORBING BOUNDARY CONDITION IN NUMERICAL SIMULATION OF WAVE PROPAGATION PROBLEMS 郭立伟; 刘晓宇; 李世海 Source Publication 工程力学 2011 Volume 28Issue:9Pages:17-22,29 ISSN 1000-4750 Abstract 为了提高人工边界条件在波动输入边界和自由场边界的精度,该文扩展了Higdon一阶吸收边界条件,并编制了相应的有限元计算程序。该方法将输入波分量引入到Higdon吸收边界条件当中,利用最小二乘法,用吸收边界邻域内的应变场和速度场计算Higdon边界条件公式中的参数,实现了吸收边界条件的自动更新。并且,该文提出了既适用于波动输入边界又适用于自由场边界的速度边界和力边界两种吸收边界条件。算例表明,与传统人工边界条件相比,该文建议的吸收边界条件具有良好的模拟效果。 Other Abstract The first-order absorbing boundary condition is extended to improve accuracy both on the free field boundary and the input wave boundary.The computer program of this absorbing boundary condition is based on finite element method.The input wave is introduced into Higdon’s boundary condition by using least-squares method,while the parameters in Higdon’s operator are estimated by the nodal strain and velocity fields inside absorbing boundary.As a result,the absorbing boundary condition is updated automatically.The velocity boundary condition and the force boundary condition are proposed to absorb reflected wave both on the free field boundary and the input wave boundary.Numerical examples show that the proposed boundary conditions have much higher accuracy compared with the conventional artificial boundary conditions. Keyword 波动 吸收边界条件 波动输入边界 自由场边界 有限元 Subject Area 力学 URL 查看原文 Indexed By EI ; CSCD Language 中文 Funding Organization 国家973项目(2010CB731506);中国科学院重要方向性项目(KJCX2-YW-L01);铁道部科技研究开发计划(2008G027-E) CSCD ID CSCD:4327533 Department LMFS工程地质体力学(LEM) Citation statistics Cited Times:1[CSCD]   [CSCD Record] Document Type 期刊论文 Identifier http://dspace.imech.ac.cn/handle/311007/45003 Collection 环境力学重点实验室(2009-2011) Corresponding Author 郭立伟 Recommended CitationGB/T 7714 郭立伟,刘晓宇,李世海. 波动数值模拟中的吸收边界条件[J]. 工程力学,2011,28(9):17-22,29. APA 郭立伟,刘晓宇,&李世海.(2011).波动数值模拟中的吸收边界条件.工程力学,28(9),17-22,29. MLA 郭立伟,et al."波动数值模拟中的吸收边界条件".工程力学 28.9(2011):17-22,29.