Application of local discontinuous Galerkin method to Einstein equations
文献类型：期刊论文
| 作者 | Cao, ZJ; Fu, P3; Ji, LW; Xia, YH |
| 刊名 | INTERNATIONAL JOURNAL OF MODERN PHYSICS D
 |
| 出版日期 | 2019 |
| 卷号 | 28期号:1页码:1950014 |
| 关键词 | SCHEME |
| ISSN号 | 0218-2718 |
| DOI | 10.1142/S0218271819500147 |
| 英文摘要 | Finite difference and pseudo-spectral methods have been widely used in the numerical relativity to solve the Einstein equations. As the third major category method to solve partial differential equations, finite element method is less frequently used in numerical relativity. In this paper, we design a finite element algorithm to solve the evolution part of the Einstein equations. This paper is the second one of a systematic investigation of applying adaptive finite element method to the Einstein equations, especially aiming for binary compact objects simulations. The first paper of this series has been contributed to the constrained part of the Einstein equations for initial data. Since applying finite element method to the Einstein equations is a big project, we mainly propose the theoretical framework of a finite element algorithm together with local discontinuous Galerkin method for the Einstein equations in the current work. In addition, we have tested our algorithm based on the spherical symmetric spacetime evolution. In order to simplify our numerical tests, we have reduced the problem to a one-dimensional space problem by taking the advantage of the spherical symmetry. Our reduced equation system is a new formalism for spherical symmetric spacetime simulation. Based on our test results, we find that our finite element method can capture the shock formation which is introduced by numerical error. In contrast, such shock is smoothed out by numerical dissipation within the finite difference method. We suspect this is partly the reason that the accuracy of finite element method is higher than the finite difference method. At the same time, different kinds of formulation parameters setting are also discussed. |
| 学科主题 | Astronomy & Astrophysics |
| 语种 | 英语 |
| 源URL | [http://ir.itp.ac.cn/handle/311006/23519]  |
| 专题 | 理论物理研究所_理论物理所1978-2010年知识产出 |
| 作者单位 | 1.Univ Chinese Acad Sci, Sch Phys Sci, Beijing 100049, Peoples R China 2.Chinese Acad Sci, Acad Math & Syst Sci, Inst Appl Math, Beijing 100190, Peoples R China 3.Chinese Acad Sci, Acad Math & Syst Sci, LSEC, Beijing 100190, Peoples R China 4.Univ Sci & Technol China, Sch Math Sci, Hefei 230026, Anhui, Peoples R China 5.Chinese Acad Sci, Inst Theoret Phys, CAS Key Lab Theoret Phys, Beijing 100190, Peoples R China |
| 推荐引用方式 GB/T 7714 | Cao, ZJ,Fu, P,Ji, LW,et al. Application of local discontinuous Galerkin method to Einstein equations[J]. INTERNATIONAL JOURNAL OF MODERN PHYSICS D,2019,28(1):1950014. |
| APA | Cao, ZJ,Fu, P,Ji, LW,&Xia, YH.(2019).Application of local discontinuous Galerkin method to Einstein equations.INTERNATIONAL JOURNAL OF MODERN PHYSICS D,28(1),1950014. |
| MLA | Cao, ZJ,et al."Application of local discontinuous Galerkin method to Einstein equations".INTERNATIONAL JOURNAL OF MODERN PHYSICS D 28.1(2019):1950014. |
入库方式： OAI收割
来源：理论物理研究所
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