Collaborative Research: ITR-(ASE)-(sim): A Multi-scale Combined Hybrid-Magnetohydrodynamic (MHD)-Neutral Atom Code

这个项目将产生一种新的空间物理模拟数值模型，它包含了在日球层和磁层动力学中被认为很重要的更大范围的物理。这将使研究人员能够研究一些日球层现象，其中小规模和大规模的特征是密不可分的。所采取的方法试图同时表示等离子体、离子和中性原子在日球层中的动力学和运动学方面。该模型将结合MHD来表示等离子体动力学和蒙特卡罗模拟技术来表示中性原子和高能粒子的传输代码。由此产生的多物理场代码将用于以下研究：(a)日球层的动力学，包括它与太阳外粒子和宇宙射线的相互作用，以及与随时间变化的太阳风和太阳周期相关的变化；(b)冲击的传播，例如与日冕物质抛射有关的冲击。它还将作为用于空间天气研究的地球空间总环流模式的基础。最终的模型将包括一个结构化网格自适应网格细化能力，以一种高效的计算方式帮助解决小规模特征，以及负载平衡和任务调度的创新方法，以便自适应代码将在高度并行的计算平台上高效运行。

This project will produce a new class of numerical model for space physics simulations that incorporates a greater range of the physics believed to be important in the dynamics of the heliosphere and magnetosphere. This will permit researchers to study some of the heliospheric phenomena that in which small-scale and large-scale features are inextricably linked. The approach to be taken seeks to represent both the dynamic and the kinematic aspects of plasma, ions and neutral atoms in the heliosphere. The model will combine MHD for representing plasma dynamics with Monte Carlo simulation techniques for representing neutral atoms and transport codes for very energetic particles. The resulting multi-physics code will be used for research into: (a) the dynamics of the heliosphere, including its interaction with extra-solar particles and cosmic rays, and changes associated with the time-dependent solar wind and solar cycle; and (b) the propagation of shocks such as those associated with coronal mass ejections. It will also be used as the basis for a geospace general circulation model for use in the study of space weather. The resulting model will include a structured-grid adaptive mesh refinement capability, to help resolve small-scale features in a computationally efficient way, and innovative approaches to load-balancing and task scheduling so that the adaptive code will run efficiently on highly parallel computing platforms.