Laboratory experiments and numerical simulations on magnetic instabilities

磁不稳定性的实验室实验和数值模拟

• 批准号: 169800991
• 负责人: Professor Dr. Günther Rüdiger
• 金额: --
• 依托单位: Leibniz-Institut für Astrophysik Potsdam (AIP)
• 依托单位国家: 德国
• 项目类别: Priority Programmes
• 财政年份: 2010
• 资助国家: 德国
• 起止时间: 2009-12-31 至 2016-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/169800991?language=en
• 关键词: Laboratory; experiments; numerical; simulations; magnetic

With the successful dynamo experiments in Riga, Karlsruhe and Cadarache a worldwide community has been established whose activities are devoted to the investigation of dynamo action in liquid metal flows. Presently, the focus of liquid metal experiments is shifting towards a better understanding of magnetic instabilities and wave phenomena in rotating flows. Most prominent among them is the magnetorotational instability (MRI) which is not only essential in destabilizing accretion disk around black holes and protostars, but which might also play an important role in the angular momentum transport in planetary dynamos. Evidence for the appearance of MRI was obtained recently with the cylindrical Taylor-Couette experiment PROMISE (Potsdam ROssendorf Magnetic InStability Experiment) under the influence of a helical magnetic field. The project is intended to exploit and strengthen the existing experimental basis for further investigations of related but nonaxisymmetric magnetic instabilities: the azimuthal MRI, the first instabilities in a magnetized spherical Couette flow, and the Tayler instability. The experiments will be supported by accompanying numerical work, with particular focus on simulations of small magnetic Prandtl number flows.

随着在里加、卡尔斯鲁厄和卡达拉奇的发电机实验的成功，已经建立了一个世界性的社区，其活动致力于研究液态金属流动中的发电机行为。目前，液态金属实验的重点正转向更好地了解旋转流动中的磁不稳定性和波动现象。其中最突出的是磁旋转不稳定性(MRI)，它不仅在黑洞和原恒星周围的吸积盘不稳定中起重要作用，而且可能在行星发电机的角动量输运中发挥重要作用。最近，在螺旋磁场的影响下，圆柱形的Taylor-Couette实验Promise(波茨坦-罗森多夫磁不稳定性实验)获得了MRI出现的证据。该项目旨在开发和加强现有的实验基础，以进一步研究相关的非轴对称磁不稳定性：方位MRI，磁化球面Couette流中的第一不稳定性，以及泰勒不稳定性。这些实验将得到伴随的数值工作的支持，特别是对小磁普朗特数流动的模拟。