Turbulent dynamos: Comparison of numerical and experimental results

湍流发电机：数值结果与实验结果的比较

• 批准号: 5370422
• 负责人: Professor Dr. Andreas Tilgner
• 金额: --
• 依托单位: Institut für Astrophysik und Geophysik
• 依托单位国家: 德国
• 项目类别: Priority Programmes
• 财政年份: 2002
• 资助国家: 德国
• 起止时间: 2001-12-31 至 2004-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/5370422?language=en
• 关键词: Turbulent; dynamos; Comparison; numerical; experimental

A large number of simulations of the geodynamo exist in which the flow in the Earth's core is modeled as a laminar or smooth motion. The real core flow is unknown but is expected to be highly turbulent, which means that it involves eddies covering a broad range of length and time scales. A realistic level of turbulence is inaccessible numerically because of limited computer ressources. The research proposed here intends to assess the discrepancies between simulation and reality introduced by the neglect of turbulence. This is possible by comparing laboratory dynamo experiments (which always use very turbulent flows) with numerical simulations of these experiments.

存在大量的地球发电机模拟，其中地球核心中的流动被建模为层流或平滑运动。真实的核心流是未知的，但预计是高度湍流的，这意味着它涉及覆盖广泛的长度和时间尺度的漩涡。由于计算机资源有限，用数值方法很难得到一个真实的湍流水平。这里提出的研究旨在评估模拟和现实之间的差异所引入的忽视湍流。这是可能的，通过比较实验室发电机实验（总是使用非常湍流）与这些实验的数值模拟。