Modelling anisotropic viscosity with astrophysical applications

通过天体物理应用模拟各向异性粘度

• 批准号: 1805074
• 金额: --
• 依托单位: University of Glasgow
• 依托单位国家: 英国
• 项目类别: Studentship
• 财政年份: 2016
• 资助国家: 英国
• 起止时间: 2016 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-1805074
• 关键词: Modelling; anisotropic; viscosity; astrophysical; applications

The project looks at how to model anisotropic effects in plamas and to evaluate their effect in the linear and nonlinear evolution of plasma instabilities. The modelling in this project is very general and has wide-ranging applications from industry to astrophysics. One particular application that we will focus on is coronal heating - how the atmosphere of the Sun can be one million Kelvin when the surface is only a few thousand Kelvin. Anisotropy in plasmas has been shown to be important in instabilities. Our new calculations, which go beyond traditional approaches, will help to determine the onset of such instabilities.Aims and objectivesDevelop a model of anisotropic MHD and implement it in an open-access code.Use this code to study the effects of anisotropy in the nonlinear evolution of instabilities.Study how anisotropy affects the non-normality of operators in MHD instabilities.Study the evolution of non-normal instabilities.The 3D nonlinear modelling of anisotropic MHD that is well-defined for arbitrary magnetic topologies is completely new. The consideration of anisotropic effects in the non-normal behaviour of plasma instabilities is also new.

该项目着眼于如何模拟等离子体中的各向异性效应，并评估其在等离子体不稳定性的线性和非线性演化中的作用。该项目中的建模非常通用，从工业到天体物理学都有广泛的应用。我们将关注的一个特殊应用是日冕加热-太阳的大气层如何能够达到一百万开尔文，而表面只有几千开尔文。等离子体的各向异性在不稳定性中是重要的。我们的新计算方法超越了传统方法，目的和目标建立一个各向异性MHD模型，并将其实现在一个开放存取的程序中。使用这个程序来研究各向异性在MHD不稳定性的非线性演化中的作用。研究各向异性如何影响MHD不稳定性中算子的非正态性。研究非正态性的演化。正常的不稳定性。三维非线性建模的各向异性MHD是定义良好的任意磁拓扑结构是全新的。在等离子体不稳定性的非正常行为中考虑各向异性效应也是新的。

项目成果

Braginskii magnetohydrodynamics for arbitrary magnetic topologies: coronal applications

任意磁拓扑的 Braginskii 磁流体动力学：日冕应用

• DOI: 10.1017/jfm.2017.463
• 发表时间: 2017
• 期刊: Journal of Fluid Mechanics
• 影响因子: 3.7
• 作者: MacTaggart D

The effect of anisotropic viscosity on the nonlinear MHD kink instability

各向异性粘度对非线性 MHD 扭结不稳定性的影响

• DOI: 10.1016/j.cnsns.2019.105131
• 发表时间: 2020
• 期刊: Communications in Nonlinear Science and Numerical Simulation
• 影响因子: 3.9
• 作者: Quinn J