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A HYBRID SOLAR WIND MODEL OF THE CESE plus HLL METHOD WITH A YIN-YANG OVERSET GRID AND AN AMR GRID
Feng, Xueshang; Zhang, Shaohua; Xiang, Changqing; Yang, Liping; Jiang, Chaowei; Wu, S. T.; Feng, XS (reprint author), Chinese Acad Sci, SIGMA Weather Grp, State Key Lab Space Weather, Ctr Space Sci & Appl Res, Beijing 100190, Peoples R China.
Department空间科学部
Source PublicationASTROPHYSICAL JOURNAL
2011
Volume734Issue:1Pages:50
ISSN0004-637X
Language英语
KeywordMagnetohydrodynamics (Mhd) Methods: Numerical Solar Wind Sun: Heliosphere
AbstractA hybrid three-dimensional (3D) MHD model for solar wind study is proposed in the present paper with combined grid systems and solvers. The computational domain from the Sun to Earth space is decomposed into the near-Sun and off-Sun domains, which are respectively constructed with a Yin-Yang overset grid system and a Cartesian adaptive mesh refinement (AMR) grid system and coupled with a domain connection interface in the overlapping region between the near-Sun and off-Sun domains. The space-time conservation element and solution element method is used in the near-Sun domain, while the Harten-Lax-Leer method is employed in the off-Sun domain. The Yin-Yang overset grid can avoid well-known singularity and polar grid convergence problems and its body-fitting property helps achieve high-quality resolution near the solar surface. The block structured AMR Cartesian grid can automatically capture far-field plasma flow features, such as heliospheric current sheets and shock waves, and at the same time, it can save significant computational resources compared to the uniformly structured Cartesian grid. A numerical study of the solar wind structure for Carrington rotation 2069 shows that the newly developed hybrid MHD solar wind model successfully produces many realistic features of the background solar wind, in both the solar corona and interplanetary space, by comparisons with multiple solar and interplanetary observations.; A hybrid three-dimensional (3D) MHD model for solar wind study is proposed in the present paper with combined grid systems and solvers. The computational domain from the Sun to Earth space is decomposed into the near-Sun and off-Sun domains, which are respectively constructed with a Yin-Yang overset grid system and a Cartesian adaptive mesh refinement (AMR) grid system and coupled with a domain connection interface in the overlapping region between the near-Sun and off-Sun domains. The space-time conservation element and solution element method is used in the near-Sun domain, while the Harten-Lax-Leer method is employed in the off-Sun domain. The Yin-Yang overset grid can avoid well-known singularity and polar grid convergence problems and its body-fitting property helps achieve high-quality resolution near the solar surface. The block structured AMR Cartesian grid can automatically capture far-field plasma flow features, such as heliospheric current sheets and shock waves, and at the same time, it can save significant computational resources compared to the uniformly structured Cartesian grid. A numerical study of the solar wind structure for Carrington rotation 2069 shows that the newly developed hybrid MHD solar wind model successfully produces many realistic features of the background solar wind, in both the solar corona and interplanetary space, by comparisons with multiple solar and interplanetary observations.
Indexed BySCI
Funding Project中国科学院空间科学与应用研究中心
Document Type期刊论文
Identifierhttp://ir.nssc.ac.cn/handle/122/3291
Collection空间科学部
Corresponding AuthorFeng, XS (reprint author), Chinese Acad Sci, SIGMA Weather Grp, State Key Lab Space Weather, Ctr Space Sci & Appl Res, Beijing 100190, Peoples R China.
Recommended Citation
GB/T 7714
Feng, Xueshang,Zhang, Shaohua,Xiang, Changqing,et al. A HYBRID SOLAR WIND MODEL OF THE CESE plus HLL METHOD WITH A YIN-YANG OVERSET GRID AND AN AMR GRID[J]. ASTROPHYSICAL JOURNAL,2011,734(1):50.
APA Feng, Xueshang.,Zhang, Shaohua.,Xiang, Changqing.,Yang, Liping.,Jiang, Chaowei.,...&Feng, XS .(2011).A HYBRID SOLAR WIND MODEL OF THE CESE plus HLL METHOD WITH A YIN-YANG OVERSET GRID AND AN AMR GRID.ASTROPHYSICAL JOURNAL,734(1),50.
MLA Feng, Xueshang,et al."A HYBRID SOLAR WIND MODEL OF THE CESE plus HLL METHOD WITH A YIN-YANG OVERSET GRID AND AN AMR GRID".ASTROPHYSICAL JOURNAL 734.1(2011):50.
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