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

在过去的十年里，发电机研究取得了巨大的进步。一方面，发电机模拟已经达到一定的成熟度，在数值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成功地进行了第一次发电机实验，发电机研究开辟了一个全新的分支。目前的项目努力加强这两个分支机构之间的联系。可以预见，发电机数值模拟的未来在于在自激磁场的影响下对快速旋转系统进行可靠的湍流模拟。该项目的目标有两个：首先，必须检查来自目前发电机实验的丰富的可用湍流数据，并特别关注它们是否适合于评估目前用于磁力主导系统的湍流模型。其次，对湍流建模感兴趣的量必须转化为对大型钠设施中测量系统的要求，其所有限制源于流体的不透明度和安全必需品。

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.