The missing link: What can dynamo simulations learn from dynamo experiments?

缺失的环节：发电机模拟可以从发电机实验中学到什么？

• 批准号: 5429146
• 负责人: Dr. Gunter Gerbeth
• 金额: --
• 依托单位: Abteilung Magnetohydrodynamik
• 依托单位国家: 德国
• 项目类别: Priority Programmes
• 财政年份: 2004
• 资助国家: 德国
• 起止时间: 2003-12-31 至 2005-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/5429146?language=en
• 关键词: missing; link; What; dynamo; simulations

The last decade has brought about tremendous progress in dynamo research. On one hand, dynamo simulations have reached a certain maturity, reproducing numerically such important features of the Earth magnetic field, as, e.g., dipolar dominance and field reversals. On the other hand, with the first successful dynamo experiments in Riga and Karlsruhe at the end of 1999, a completely new branch of dynamo research has been opened up. The present project strives to tighten the connection between the two branches. It can be anticipated that the future of numerical dynamo simulations lies with a reliable turbulence modeling in fastly rotating systems evolving under the influence of a self-excited magnetic field. The goals of the project are twofold: Firstly, the wealth of available turbulence data from the present dynamo experiments has to be inspected with a special focus on their suitability to evaluate present turbulence models for magnetically dominated systems. Secondly, the quantities which would be interesting for turbulence modeling have to be translated into requirements for the measurement system in large sodium facilities with all their restrictions stemming from the opaqueness of the fluid and from safety necessities.

过去的十年在发电机研究方面取得了巨大的进展。一方面，发电机模拟已经达到了一定的成熟度，在数字上再现了地球磁场的重要特征，例如，偶极优势和场反转。另一方面，随着1999年底在里加和卡尔斯鲁厄进行的第一次成功的发电机实验，发电机研究的一个全新的分支已经开辟。本项目力求加强这两个分支机构之间的联系。可以预见的是，未来的数值发电机模拟在于一个可靠的湍流模型在快速旋转系统的自激磁场的影响下发展。该项目的目标是双重的：首先，丰富的可用的湍流数据，从目前的发电机实验进行检查，特别关注其适用性，以评估目前的湍流模型的磁主导系统。其次，湍流建模所关注的量必须转化为大型钠设施中测量系统的要求，其所有限制都源于流体的不透明性和安全必要性。