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

该项目将为空间物理学模拟产生一类新的数值模型，其中纳入据信在日光层和磁层动态中具有重要意义的更广泛的物理学。这将使研究人员能够研究一些小尺度和大尺度特征密不可分的日光层现象。 所采取的方法力求表现日光层中等离子体、离子和中性原子的动力学和运动学方面。 该模型将结合联合收割机MHD代表等离子体动力学与蒙特卡罗模拟技术代表中性原子和非常高能粒子的传输代码。 由此产生的多物理场代码将用于研究：（a）日光层动态，包括日光层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有关的变化;（B）与日冕物质抛射有关的冲击等冲击的传播。 它还将用作空间气象研究中使用的地球空间大气环流模型的基础。 由此产生的模型将包括结构网格自适应网格细化能力，以帮助以计算效率高的方式解决小规模的功能，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有效运行。

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.