Modeling Physical Processes in the Solar Wind and Local Interstellar Medium with a Multi-Scale Fluid-Kinetic Simulation Suite

使用多尺度流体动力学模拟套件对太阳风和当地星际介质中的物理过程进行建模

• 批准号: 1615206
• 负责人: Nikolai Pogorelov
• 金额: $ 2.01万
• 依托单位: University of Alabama in Huntsville
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2016
• 资助国家: 美国
• 起止时间: 2016-05-01 至 2019-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1615206&HistoricalAwards=false
• 关键词: Modeling; Physical; Processes; Solar; Wind

Flows of partially ionized plasma are frequently characterized by the presence of both thermaland nonthermal populations of ions. For example, this occurs in the outer heliosphere: the part of interstellar space beyond the solar system whose properties are determined by the solar wind (SW) interaction with the localinterstellar medium (LISM). Simulation of the SW-LISM interaction problem with data-driven boundaryconditions, requires the application of adaptive mesh refinement technologies and petascale supercomputers.The objective of this proposal is to use the Blue Waters system to model solar winds (SW) flows in the inner and outer heliosphere, and compare the simulation results with observational data, thereby revealing the fundamental physics of non-thermal plasma-neutral flows.The project will address a variety of physical phenomena occurring throughout the solar system, e.g., charge exchange processes between neutraland charged particles, the birth of pick-up ions (PUIs), the origin of energetic neutral atoms (ENAs),turbulence, the interplay of the heliopause instability and magnetic reconnection at the SW-LISM interface,properties of the heliotail, etc. Additionally, the project will fit the simulation results with observational data to make it possibleto constrain the properties of the LISM and refine time-dependent SW models. The work proposed here is expected to have major impact in several areas. The projectwill provide a leap forward in the computation and simulation of complex charged and neutral gas systems.The development of codes that embrace "coupling complexity" via the self-consistent incorporation of multiplephysical scales and processes in models is viewed as a pivotal development in the different plasmaphysics areas for the current decade. The ubiquity of the underlying model suggests numerous applicationsin space physics, astrophysics, and, in general, plasma physics problems. The components of our physicalmodel and corresponding code routines in the publicly accessible simulation suite may be also useful tomodel plasma-beam interactions in Tokamak fusion devices to be implemented in the burning plasma experimentITER. Besides the impact on the modeling of complex physical systems, the project anticipates that theirapproach to computational resource management for complex codes utilizing multiple algorithm technologieswill be a major advance on current approaches. Additionally, collaboration with the Blue Waters team will further promote the application of adaptive technologies to contemporary plasma physics problems through the development of publicly available packages suitablefor multiple applications. Finally, the project will provide leadership in promoting computational science and plasmaphysics within the UAH campus and, through the training of a broad spectrum of specialists, foster newtechnologies within an EPSCoR state.

部分电离等离子体流的特征通常是同时存在热离子和非热离子。例如，这发生在太阳系以外的星际空间的一部分，其性质由太阳风（SW）与本地星际介质（LISM）的相互作用决定。利用Blue沃茨系统模拟日球层内外太阳风的流动，并将模拟结果与观测数据进行比较。从而揭示非热等离子体中性流的基本物理。该项目将研究整个太阳系中发生的各种物理现象，例如，中性粒子和带电粒子之间的电荷交换过程、拾取离子（PUI）的诞生、高能中性原子（ENA）的起源、湍流、太阳顶不稳定性和SW-LISM界面磁场重联的相互作用、日尾的性质等。该项目将把模拟结果与观测数据相匹配，从而有可能限制LISM的属性并改进时间-依赖软件模型。这里提出的工作预计将在几个领域产生重大影响。该项目提供了一个飞跃的计算和模拟复杂的带电和中性气体system.The代码的发展，拥抱“耦合复杂性”通过自我一致的合并模型中的multiplephysical尺度和过程被视为一个关键的发展，在不同的等离子体物理学领域在本十年。基础模型的普遍性表明了空间物理学、天体物理学以及一般等离子体物理问题中的许多应用。我们的physicalmodel和相应的代码例程在公开访问的模拟套件的组件也可能是有用的tomodel等离子体束相互作用的托卡马克聚变装置在燃烧等离子体experimentITER中实施。除了对复杂物理系统建模的影响外，该项目预计，利用多算法技术对复杂代码进行计算资源管理的方法将是当前方法的重大进步。 此外，与Blue沃茨团队的合作将通过开发适用于多种应用的公开软件包，进一步促进自适应技术在当代等离子体物理问题中的应用。最后，该项目将在UAH校园内促进计算科学和等离子体物理学方面发挥领导作用，并通过培训广泛的专家，在EPSCoR状态下促进新技术。