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

这项提议的目的是利用蓝水超级计算机提供的可能性来模拟基本的和具有挑战性的空间物理问题。日球层是由太阳主导的球状空间区域，它远远超出了冥王星的轨道。太阳风（SW）由来自太阳的电离原子组成。该项目将模拟内外日球层的西南气流，并将结果与观测数据进行比较。预计该项目将为复杂带电气体和中性气体系统的模拟提供一个飞跃。此外，所提出的利用多种算法技术对复杂代码进行计算资源管理的方法有望成为当前方法的重大进步。资源管理技术的发展将对所有未来的建模工作至关重要，这些建模工作将包含各种规模和物理过程。对具有多重或高度局域尺度和多重过程特征的部分电离等离子体流的分析将对太阳物理学产生变革性影响。该项目将研究发生在整个太阳系的各种物理现象，如中性粒子和带电粒子之间的电荷交换过程、吸收离子（PUIs）的诞生、高能中性原子（ENAs）的起源、湍流、太阳层顶不稳定性和在SW和本地星际介质（LISM）界面的磁重联的相互作用、LISM中的等离子体波的产生、太阳层对TeV宇宙射线各向异性的影响。和更多。该项目还将将模拟结果与观测数据拟合，以约束LISM的特性，并改进时间相关的SW模型。该项目将包括来自新帕克太阳探测器和太阳轨道飞行器任务的直接测量，以及来自新视野号、旅行者号、IBEX和风淋观测的从太阳到地球以及更远的日球层边界的SW的原位测量。该项目将提取伴随高能粒子相互作用的等离子体中性流的基本物理。建模活动的目标是以一种以前由于物理模型和计算能力的限制而无法想象的方式来理解和解释观察结果。物理模型的组件和相应的代码例程将在一个可公开访问的仿真套件中提供。该奖项反映了美国国家科学基金会的法定使命，并通过使用基金会的知识价值和更广泛的影响审查标准进行评估，被认为值得支持。

The objective of this proposal is to use the possibilities provided by the Blue Waters supercomputer to model fundamental and challenging space physics problems. The heliosphere is the sphere like region of space dominated by the Sun, which extends far beyond the orbit of Pluto. The Solar Wind (SW) consists of ionized atoms from the Sun. The project will model the SW flows in the inner and outer heliosphere, and compare the results with observational data. It is anticipated that the project will provide a leap forward in the simulation of complex charged and neutral gas systems. Furthermore, the proposed approach to computational resource management for complex codes utilizing multiple algorithm technologies is expected to be a major advance to current approaches. The development of resource management technologies will be essential for all future modeling efforts that incorporate a wide diversity of scales and physical processes.The analysis of flows of partially ionized plasma that are characterized by multiple or highly localized scales and multiple processes, will have a transformative impact for heliophysics. The project will address a variety of physical phenomena occurring throughout the solar system, such as the charge exchange processes between neutral and 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 and local interstellar medium (LISM) interface, plasma wave generation in the LISM, the effect of the heliosphere on the TeV cosmic ray anisotropy, and more. The project will also fit simulation results with observational data to constrain the properties of the LISM and refine time-dependent SW models. The project will incorporate the direct measurements from the New Parker Solar Probe and Solar Orbiter missions, as well as the in situ measurements of the SW from the Sun to Earth and further to the heliospheric boundary, from the New Horizons, Voyager, IBEX, and air shower observations. This project will extract the fundamental physics of plasma-neutral flows accompanied by the interaction with energetic particles. The goal of the modeling activities is to understand and interpret observations in a way previously unthinkable because of the limitations in both physical models and computing power. Components of the physical model and corresponding code routines will be made available in a publicly accessible simulation suite.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.