An improved CESE method and its application to steady-state coronal structure simulation  

作　　者：ZHOU YuFen FENG XueShang 

机构地区：[1]SIGMA Weather Group, State Key Laboratory for Space Weather, Center for Space Science and Applied Research,Chinese Academy of Sciences

出　　处：《Science China Earth Sciences》2014年第1期153-166,共14页中国科学（地球科学英文版）

基　　金：supported by the National Basic Research Program of China(Grant No.2012CB825601);the Knowledge Innovation Program of the Chinese Academy of Sciences(Grant No.KZZD-EW-01-4);the National Natural Science Foundation of China(Grant Nos.41031066,41231068,41074121&41074122);the Specialized Research Fund for State Key Laboratories

摘　　要：This paper presents an improved space-time conservation element and solution element(CESE)method by applying a non-staggered space-time mesh system and simply improving the calculation of flow variables and applies it to magnetohydrodynamics(MHD)equations.The improved CESE method can improve the solution quality even with a large disparity in the Courant number(CFL)when using a fixed global marching time.Moreover,for a small CFL(say<0.1),the method can significantly reduce the numerical dissipation and retain the solution quality,which are verified by two benchmark problems.And meanwhile,comparison with the original CESE scheme shows better resolution of the improved scheme results.Finally,we demonstrate its validation through the application of this method in three-dimensional coronal dynamical structure with dipole magnetic fields and measured solar surface magnetic fields as the initial input.This paper presents an improved space-time conservation element and solution element （CESE） method by applying a non-staggered space-time mesh system and simply improving the calculation of flow variables and applies it to magnetohy- drodynamics （MHD） equations. The improved CESE method can improve the solution quality even with a large disparity in the Courant number （CFL） when using a fixed global marching time. Moreover, for a small CFL （say 〈 0.1）, the method can significantly reduce the numerical dissipation and retain the solution quality, which are verified by two benchmark problems. And meanwhile, comparison with the original CESE scheme shows better resolution of the improved scheme results. Finally, we demonstrate its validation through the application of this method in three-dimensional coronal dynamical structure with di- pole magnetic fields and measured solar surface magnetic fields as the initial input.

关 键 词：improved CESE scheme numerical dissipation steady-state coronal structure 

分 类 号：P182.6[天文地球—天文学]