论文标题
Tokamaks中垂直位移事件的3D模拟：M3D-C $^1 $的基准，Nimrod和Jorek
3D simulations of vertical displacement events in tokamaks: A benchmark of M3D-C$^1$, NIMROD and JOREK
论文作者
论文摘要
近年来，非线性3D磁水动力学代码Jorek，M3D-C $^1 $，Nimrod开发了建模现实的3D垂直位移事件（VDE）的能力，包括电阻壁。在本文中，在这些最新法规之间介绍了全面的3D VDE基准。模拟情况基于实验性NSTX等离子体，但具有简化的矩形壁。尽管物理模型和数值方法之间存在明显的差异，但比较显示出与用于表征诸如3D壁力和能量衰减之类的中断的相关数量的很好的一致性。该基准不仅对使用上述代码进行中断研究具有信心，而且还显示了与使用模型有关的差异（例如，减少与完整的MHD模型相比）。模拟显示了NSTX等离子体的重要3D特征，例如光环电流的自洽演变和壁力的起源。与基于纵横比的排序下降的其他减少的MHD模型相反，基于ANSATZ的Jorek降低的MHD模型即使在此处考虑的球形Tokamak限制中也可以捕获3D动力学。
In recent years, the nonlinear 3D magnetohydrodynamic codes JOREK, M3D-C$^1$ and NIMROD developed the capability of modelling realistic 3D vertical displacement events (VDEs) including resistive walls. In this paper, a comprehensive 3D VDE benchmark is presented between these state of the art codes. The simulated case is based on an experimental NSTX plasma but with a simplified rectangular wall. In spite of pronounced differences between physics models and numerical methods, the comparison shows very good agreement in the relevant quantities used to characterize disruptions such as the 3D wall forces and energy decay. This benchmark does not only bring confidence regarding the use of the mentioned codes for disruption studies, but also shows differences with respect to the used models (e.g. reduced versus full MHD models). The simulations show important 3D features for a NSTX plasma such as the self-consistent evolution of the halo current and the origin of the wall forces. In contrast to other reduced MHD models based on an ordering in the aspect ratio, the ansatz based JOREK reduced MHD model allows capturing the 3D dynamics even in the spherical tokamak limit considered here.
