KMS Of Academy of mathematics and systems sciences, CAS
A NOVEL LEAST SQUARES METHOD FOR HELMHOLTZ EQUATIONS WITH LARGE WAVE NUMBERS | |
Hu, Qiya1,2; Song, Rongrong1,2 | |
2020 | |
发表期刊 | SIAM JOURNAL ON NUMERICAL ANALYSIS |
ISSN | 0036-1429 |
卷号 | 58期号:5页码:3091-3123 |
摘要 | In this paper we are concerned with numerical methods for Helmholtz equations with large wave numbers. We design a least squares method for discretization of the considered Helmholtz equations. In this method, an auxiliary unknown is introduced on the common interface of any two neighboring elements and a quadratic objective functional is defined by the jumps of the traces of the solutions of local Helmholtz equations across all the common interfaces, where the local Helmholtz equations are defined on elements and are imposed Robin-type boundary conditions given by the auxiliary unknowns. A minimization problem with the objective functional is proposed to determine the auxiliary unknowns. The resulting discrete system of the auxiliary unknowns is Hermitian positive definite and so it can be solved by the preconditioned conjugate gradient method. Under some assumptions we show that the generated approximate solutions possess almost the same L-2 convergence order as the plane wave methods (for the case of constant wave number). Moreover, we construct a substructuring preconditioner for the discrete system of the auxiliary unknowns. Numerical experiments show that the proposed methods are very effective and have little "wave number pollution" for the tested Helmholtz equations with large wave numbers. |
关键词 | Helmholtz equations inhomogeneous media large wave number auxiliary unknowns least squares error estimates preconditioner |
DOI | 10.1137/19M1294101 |
收录类别 | SCI |
语种 | 英语 |
资助项目 | National Natural Science Foundation of China[G12071469] |
WOS研究方向 | Mathematics |
WOS类目 | Mathematics, Applied |
WOS记录号 | WOS:000584721000027 |
出版者 | SIAM PUBLICATIONS |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://ir.amss.ac.cn/handle/2S8OKBNM/52508 |
专题 | 中国科学院数学与系统科学研究院 |
通讯作者 | Hu, Qiya |
作者单位 | 1.Chinese Acad Sci, Acad Math & Syst Sci, ICMSEC, LSEC, Beijing 100190, Peoples R China 2.Univ Chinese Acad Sci, Sch Math Sci, Beijing 100049, Peoples R China |
推荐引用方式 GB/T 7714 | Hu, Qiya,Song, Rongrong. A NOVEL LEAST SQUARES METHOD FOR HELMHOLTZ EQUATIONS WITH LARGE WAVE NUMBERS[J]. SIAM JOURNAL ON NUMERICAL ANALYSIS,2020,58(5):3091-3123. |
APA | Hu, Qiya,&Song, Rongrong.(2020).A NOVEL LEAST SQUARES METHOD FOR HELMHOLTZ EQUATIONS WITH LARGE WAVE NUMBERS.SIAM JOURNAL ON NUMERICAL ANALYSIS,58(5),3091-3123. |
MLA | Hu, Qiya,et al."A NOVEL LEAST SQUARES METHOD FOR HELMHOLTZ EQUATIONS WITH LARGE WAVE NUMBERS".SIAM JOURNAL ON NUMERICAL ANALYSIS 58.5(2020):3091-3123. |
条目包含的文件 | 条目无相关文件。 |
个性服务 |
推荐该条目 |
保存到收藏夹 |
查看访问统计 |
导出为Endnote文件 |
谷歌学术 |
谷歌学术中相似的文章 |
[Hu, Qiya]的文章 |
[Song, Rongrong]的文章 |
百度学术 |
百度学术中相似的文章 |
[Hu, Qiya]的文章 |
[Song, Rongrong]的文章 |
必应学术 |
必应学术中相似的文章 |
[Hu, Qiya]的文章 |
[Song, Rongrong]的文章 |
相关权益政策 |
暂无数据 |
收藏/分享 |
除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。
修改评论