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Numerical study of successive CMEs during November 4―5, 1998

science china(Technological sciences) 2008年第10期51卷 1600-1610页

作者： zhou yufen & feng XueShang {3. weather group, state key laboratory for space weather, center for space science and Applied research, chinese academy of sciences, beijing 100190,{{13. 1. sigma weather group State Key Laboratory for Space Weather Center for Space Science and Applied Research Chinese Academy of Sciences Beijing 100190 China

We present the solar-terrestrial transit process of three successive coronal mass ejections (CMEs) of November 4―5, 1998 originating from active region 83.5 by using a time-dependent three-dimensional magnetohydrodynamics (MHD) simula-tion. These CMEs interacted with each other while they were propagating in inter-planetary space and finally formed a "complex ejecta". A newly developed SIP-CESE MHD model was applied to solve MHD equations numerically. The quiet solar wind was started from Parker-like 1D solar wind solution and the magnetic field map was calculated from the solar photospheric magnetic field data. In our simulation, the ejections were initiated using pulse in the real active region 83.5. The interplanetary disturbance parameters, such as speed, direction and angular size of the expanding CME, were determined from the SOHO/LASCO data with the cone-model. We discussed the three-dimensional aspects of the propagation, in-teraction and merging of the three ejections. The simulated interplanetary shocks were compared with the nearby-Earth measurement. The results showed that our simulation could reproduce and explain some of the general features observed by satellite for the "complex ejecta".

关键词： complex ejecta three-dimensional MHD simulation SIP-CESE MHD model

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

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science china Earth sciences 2014年第1期57卷 153-166页

作者： zhou yufen feng XueShang sigma weather group State Key Laboratory for Space Weather Center for Space Science and Applied ResearchChinese Academy of Sciences

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)*** improved CESE method can improve the solution quality even with a large disparity in the Courant number(CFL)when using a fixed global marching ***,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 *** meanwhile,comparison with the original CESE scheme shows better resolution of the improved scheme ***,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.

关键词： improved CESE scheme numerical dissipation steady-state coronal structure

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A Two-Dimensional Third-Order CESE Scheme for Ideal MHD Equations

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Communications in Computational Physics 2023年第6期33卷 94-115页

作者： yufen zhou Xueshang feng sigma weather group State Key Laboratory for Space WeatherNational Space Science CenterChinese Academy of ScienceBeijing 100190China Shenzhen key laboratory of Numerical Prediction for space Storm Institute of Space Science and Applied TechnologyHarbin Institute of TechnologyShenzhen 518055China

In this paper,we construct a two-dimensional third-order space-time conservation element and solution element(CESE)method and apply it to the magnetohydrodynamics(MHD)*** third-order CESE method preserves all the favorable attributes of the original second-order CESEmethod,such as:(i)flux conservation in space and time without using an approximated Riemann solver,(ii)genuine multi-dimensional algorithm without dimensional splitting,(iii)the use of the most compact mesh stencil,involving only the immediate neighboring cells surrounding the cell where the solution at a new time step is sought,and(iv)an explicit,unified space-time integration procedure without using a quadrature integration *** order to verify the accuracy and efficiency of the scheme,several 2D MHD test problems are *** result of MHD smooth wave problem shows third-order convergence of the *** results of the other MHD test problems show that the method can enhance the solution quality by comparing with the original second-order CESE scheme.

关键词： CESE method third-order MHD equations

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Application of ADER Scheme in MHD Simulation

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空间科学学报 2012年第2期32卷 170-181页

作者： ZHANG Yanyan feng Xueshang JIANG Chaowei zhou yufen state key laboratory of {3. weather Center for Space Science and Applied ResearchChinese Academy of SciencesBeijing 100190 Graduate University of chinese academy of sciences Beijing 100049

The Arbitrary accuracy Derivatives Riemann problem method(ADER) scheme is a new high order numerical scheme based on the concept of finite volume integration,and it is very easy to be extended up to any order of space and time accuracy by using a Taylor time expansion at the cell interface *** far the approach has been applied successfully to flow mechanics *** objective here is to carry out the extension of multidimensional ADER schemes to multidimensional MHD systems of conservation laws by calculating several MHD problems in one and two dimensions: (ⅰ) Brio-Wu shock tube problem,(ⅱ) Dai-Woodward shock tube problem,(ⅲ) Orszag-Tang MHD vortex *** numerical results prove that the ADER scheme possesses the ability to solve MHD problem,remains high order accuracy both in space and time,keeps precise in capturing the ***,the compared tests show that the ADER scheme can restrain the oscillation and obtain the high order non-oscillatory result.

关键词： ADER scheme Generalized Riemann problem MHD numerical simulation HLL scheme

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3. numerical study of typical CME event: The 2010-04-03.event

3D numerical study of typical CME event: The 2010-04-03 even...

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2014年中国地球科学联合学术年会——专题29：空间天气与人类活动

作者： yufen zhou Xueshang feng Xinhua Zhao sigma weather group State Key Laboratory of Space Weather Center for Space Science and Applied Research Chinese Academy of Science

The coronal mass ejection(CME)event on April 3.2010 is the first fast CME observed by STEREO SECCHI/HI for the full Sun-Earth *** an event provides us a good opportunity to study the propagation and evolution of CME from the Sun up to 1 *** this paper,we study the time-dependent evolution and propagation of this event from the Sun to Earth using the 3. SIP-CESE MHD *** CME is initiated by a simple spherical plasmoid model:a spheromak magnetic structure with high speed,high pressure and high plasma density *** find that the results can successfully reproduce the observations in the STEREO

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A New Hybrid Numerical Scheme for Two-Dimensional Ideal MHD Equations

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chinese Physics Letters 2012年第9期29卷 101-104页

作者： zhou Yu-Fen feng Xue-Shang sigma weather group State Key Laboratory for Space WeatherCenter for Space Science and Applied ResearchChinese Academy of SciencesBeijing 100190

We present a new hybrid numerical scheme for two-dimensional(2D)ideal magnetohydrodynamic(MHD)equations.A simple conservation element and solution element(CESE)method is used to calculate the flow variables,and the unknown first-order spatial derivatives involved in the CESE method are computed with a finite volume scheme that uses the solution of the derivative Riemann problem with limited reconstruction to evaluate the numerical flux at cell interface *** show the validation and capacity of its application to 2D MHD problems,we study several benchmark *** results verify that the hybrid scheme not only performs well,but also can retain the solution quality even if the Courant number ranges from close to 1 to less than 0.01.

关键词： scheme element verify

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