中国科学院上海天文台-地球物理和天体物理流体力学系列讲座

报告题目：Numerical Simulation of Planetary Dynamo in the Inviscid Limit

报告人： 袁龙辉 (ETH Zurich)

报告地点: 三楼中会议室

报告时间：2025年 7 月 17 日（周四） 上午10:00

报告摘要：

Earth’s magnetic field is generated and maintained over billions of years by the geodynamo process, governed by a set of highly nonlinear, coupled partial differential equations that can only be solved numerically. However, the overwhelming dominance of the Coriolis force over viscous and inertial effects in Earth’s core makes direct numerical simulations (DNS) in Earth-like regimes extremely challenging. I will present the current status of the first 3D inviscid convective geodynamo model developed in a full-sphere geometry. This model has the potential to offer new insights into the dynamo of Earth (and other planets) that are difficult to access using conventional DNS. I will also present results on inviscid torsional oscillations, which serve as a simple testbed for inviscid magnetohydrodynamic (MHD) computations in a spherical shell geometry. A theoretically plausible and previously unrecognized class of torsional normal modes will be discussed. An encouraging result is that, when viscosity is retained, decreasing the Ekman number leads to convergence toward the inviscid solution.

报告人简介：