Flux expulsion in shallow water magnetohydrodynamics

浅水磁流体动力学中的通量排出

• 批准号: 2237692
• 金额: --
• 依托单位: UNIVERSITY OF EXETER
• 依托单位国家: 英国
• 项目类别: Studentship
• 财政年份: 2019
• 资助国家: 英国
• 起止时间: 2019 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-2237692
• 关键词: Flux; expulsion; shallow; water; magnetohydrodynamics

Magnetic fluids of the Earth, Sun, stars and galaxies are generated by the motion of electrically conducting fluid, for example hydrogen plasma in the case of the Sun, liquid metal for the Earth. The project concerns a fundamental process in the interaction of magnetic field and fluid called flux expulsion, where field is expelled from regions of closed streamlines, for example a fluid vortex. This process was first identified by Nigel Weiss in the 1960s, but it was only recently that studies included the magnetic field feedback on the flow through the Lorentz force, e.g. Gilbert, Mason and Tobias (2016). The goal of the project is to study flux expulsion in a thin layer using the equations of shallow water magnetohydrodynamics (MHD) where the fluid motion is coupled to gravity waves. Such models are relevant to the solar tachocline and other systems where the fluid is stratified. The study would initially use numerical simulations in periodic geometry, but the goal would be also to develop scaling laws and analytical models.

地球、太阳、恒星和星系的磁性流体是由导电流体的运动产生的，例如太阳的氢等离子体，地球的液态金属。该项目涉及磁场和流体相互作用中的一个基本过程，称为通量排出，即磁场从闭合流线区域(例如流体涡流)中排出。这一过程最初是由Nigel Weiss在20世纪60年代发现的，但直到最近才有研究包括通过洛伦兹力流动的磁场反馈，例如Gilbert，Mason和Tobias(2016)。该项目的目标是利用浅水磁流体动力学(MHD)方程研究薄层中的通量排出，其中流体运动与重力波耦合。这样的模型与太阳角跃层和其他流体分层的系统有关。这项研究最初将使用周期几何中的数值模拟，但目标也将是开发比例定律和分析模型。