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Academy of Mathematics and Systems Science, CAS Colloquia & Seminars：Global strong solutions to the two-dimensional radially symmetric compressible MHD
二维径向对称 可压缩 磁流体动力学 全局强解
2023/12/11
In this talk, I will present our recent result the 2D radially symmetric compressible MHD with density-dependent viscosity. Under the condition of beta>1, we prove the global existence of the radially...
Academy of Mathematics and Systems Science, CAS Colloquia & Seminars：Structure-Preserving Spectral Method for Large-Scale MHD System Simulation
MHD 系统仿真 保结构谱
2023/11/6
Structure-preserving numerical methods are crucial for achieving long-time accurate, stable, consistent and physically meaningful simulations. In this talk, we present H^1 and H(div) conforming spectr...
反常热输运是核聚变研究的核心问题之一，微湍流被普遍认为是导致反常热输运的主要因素。微湍流可以被常共存于等离子体中的MHD不稳定性所调制（平衡调制或非线性耦合），进而影响等离子体反常热输运水平。中高波数微湍流被MHD不稳定性调制的成果鲜有实验报道，鉴定及进一步的理解这种非线性相互作用不仅有助于预测以及改善将来聚变装置如ITER、CFETR等离子体的约束行为，也有利于其的安全运行及理论模型的完善。近日...
反常热输运是核聚变研究的核心问题之一，微湍流被普遍认为是导致反常热输运的主要因素。微湍流可以被常共存于等离子体中的MHD不稳定性所调制（平衡调制或非线性耦合），进而影响等离子体反常热输运水平。中高波数微湍流被MHD不稳定性调制的成果鲜有实验报道，鉴定及进一步的理解这种非线性相互作用不仅有助于预测以及改善将来聚变装置如ITER、CFETR等离子体的约束行为，也有利于其的安全运行及理论模型的完善。
开发高性能的磁流体力学数值模拟方法是提高空间天气数值预报研究的一个重要方面.有限体积法的逆风分裂格式具有良好的间断捕获能力，Steger-Warming和AUSM（Advection Upstream Splitting Method）是逆风分裂格式FVS（Flux Vector Splitting）方法中具有代表性的两种格式.采用这两种格式求解具有伽利略不变性的扩展型广义拉格朗日乘子磁流体力学（...
月球作为一个既没有全球性磁场又没有明显大气层的星体，一直以来都认为太阳风是直接作用在月球向阳面且被完全吸收。然而近年来，越来越多的观测与模拟结果表明，太阳风与月表的相互作用由于月表局地磁异常的存在而出现一些”例外”，在一定条件下，可以形成月表微磁层（LMM）。
Eigenvalues, Eigenvectors and Symmetrization of the Magneto-Hydrodynamic (MHD) Equations
Eigenvalues Eigenvectors MHD
2015/6/23
Eigenvalues, Eigenvectors and Symmetrization of the Magneto-Hydrodynamic (MHD) Equations。
基于全球三维磁层MHD（Magnetohydrodynamics）模拟模型， 研究了行星际磁场（Interplanetary Magnetic Field， IMF）北向与南向时磁尾横断面（X=?18 RE）的结构及等离子片的粒子注入机制. 模拟结果很好地符合一些已知的观测数据和经验模型. 从向阳面磁层顶IMF及重联后磁力线尾向运动过程的角度， 对磁尾横断面粒子热压力分布、磁力线投影、等离子片或电...
Plane Stagnation Double-Diffusive MHD Convective Flow with Convective Boundary Condition in a Porous Media
Plane Stagnation Double-Diffusive MHD Convective Flow and Porous Media
2013/1/30
A numerical analysis has been carried out to study the problem of plane stagnation double-diffusive MHD convective flow with convective boundary condition in a porous media. The governing nonlinear pa...
Long-time properties of MHD turbulence and the role of symmetries
Long-time properties MHD turbulence the role of symmetries Fluid Dynamics
2012/4/20
We investigate long-time properties of three-dimensional MHD turbulence in the absence of forcing and examine in particular the role played by the quadratic invariants of the system and by the symmetr...
Heat Generation Effects on MHD Natural Convection Flow along a Vertical Wavy Surface with Variable Thermal Conductivity
Natural Convection Magnetohydrodynamics Heat Transfer Wavy Surface Temperature Dependent Thermal Conductivity Heat Generation
2013/1/30
The heat generation effects on magnetohydrodynamic(MHD) natural convection flow along a vertical wavy surface with variable thermal conductivity have been investigated. The governing boundary layer eq...
Analysis of 3D MHD Instability of Antisolar Latitudinal Differential Rotation in F, G and K stars
Analysis Instability Latitudinal Differential Rotation
2011/10/8
Motivated by observations that only a very few stars have been found to have antisolar differential rotation, much weaker in amplitude than that of the Sun, we analyze the stability of antisolar and s...
A non-ideal MHD Gadget: Simulating massive galaxy clusters
MHD - magnetic fi elds - methods: numerical - galax- ies: clusters
2011/9/28
Magnetic fields in the intra-cluster medium of galaxy clusters have been studied in the past years through different methods. In the next years the up-coming generation of radio telescopes is going to...
High Lundquist Number Resistive MHD Simulations of Magnetic Reconnection: Searching for Secondary Island Formation
Lundquist Number Resistive MHD Simulations Magnetic Reconnection
2011/9/9
Recently, secondary island formation due to the tearing instability of the Sweet-Parker current sheet was identified as a possible mechanism that can lead to fast reconnection (less sensitive dependen...