CAREER: Continuum Kinetic Studies of Hydrodynamic and Magneto Hydrodynamic Instabilities

职业：流体动力学和磁流体动力学不稳定性的连续动力学研究

• 批准号: 2345433
• 负责人: Bhuvana Srinivasan
• 金额: $ 60万
• 依托单位: University of Washington
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2023
• 资助国家: 美国
• 起止时间: 2023-10-01 至 2025-03-31
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2345433&HistoricalAwards=false
• 关键词: CAREER; Continuum; Kinetic; Studies; Hydrodynamic

Observations of supernovae explosions that occur upon the death of a star have been made and documented for thousands of years. Such observations have motivated laboratory experiments to replicate astrophysical phenomena. Concurrently, there has been development of computational modeling capabilities aimed at reproducing results from both observations and experiments. The goal of this project is to conclusively address the existing discrepancies between numerical simulations and real world measurements in regimes of relevance to astrophysics. Novel numerical tools to be developed as part of this study will have broad applicability to fundamental science questions, national security, energy, and spacecraft engineering. The strongly integrated education plan will engage students from K-12 through graduate school in research and career opportunities in science, technology, engineering, and mathematics (STEM) through an online user experience. The education and outreach activities will also strive to encourage women and under-represented groups to pursue STEM careers through collaborations with the Center for the Enhancement of Engineering Diversity at Virginia Tech and minority-serving community colleges in Virginia.In high-energy-density regimes, numerical simulations have been unable to reproduce the results from experiments and observations for decades. The state-of-the-art in numerical simulations of high-energy-density astrophysical and laboratory plasmas uses fluid models, specifically radiation-hydrodynamic and radiation-magnetohydrodynamic models. Significant deficiencies in these single-fluid models include the inability to capture physics effects included in more advanced high-fidelity multi-fluid models. The missing physics can notably impact plasma transport, which may have significant anisotropies. Furthermore, the effect of non-thermal particle population on plasma transport may be missed even by most advanced fluid models. The key to matching experimental data has been to include ad hoc tunable parameters in fluid simulations. What is necessary, but has been impractical until recently due to computational limitations, are first-principles high-dimensional kinetic calculations that can address conclusively whether the discrepancies between experiments and hydrodynamic codes could be explained using kinetic physics. The present study will include first-principles kinetic calculations using a novel, continuum-kinetic, high-order accurate, and computationally efficient algorithm to study plasma dynamics and transport in the presence of hydrodynamic and magnetohydrodynamic instabilities in high-energy-density plasmas. This project will address long-standing discrepancies between high-energy-density experiments and simulations and, as a result, could significantly advance our understanding of plasma transport with implications in a number of research areas.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.

对恒星死亡后发生的超新星爆炸发生的观察已经进行了数千年的历史。这些观察结果促使实验室实验复制天体物理现象。同时，已经开发了旨在重现观测和实验结果的计算建模功能。该项目的目的是最终解决与天体物理学相关制度中数值模拟与现实世界测量之间的现有差异。作为这项研究的一部分开发的新型数值工具将在基本科学问题，国家安全，能源和航天器工程中具有广泛的适用性。 强烈融合的教育计划将通过在线用户体验通过研究生院与研究生院的学生参与科学，技术，工程和数学（STEM）的研究和职业机会。教育和外展活动还将努力鼓励妇女和代表性不足的团体通过与弗吉尼亚州弗吉尼亚州和少数族裔服务社区的工程多样性中心的合作来从事STEM职业。高能密度天体物理和实验室等离子体的数值模拟中的最新图片使用流体模型，特别是放射线流动力学和放射性 - 纳图水力动力学模型。这些单流体模型中的明显缺陷包括无法捕获更先进的高保真多流体模型中的物理效应。 缺失的物理学可能会显着影响血浆转运，这可能具有明显的各向异性。此外，即使大多数高级流体模型，非热颗粒种群对等离子体转运的影响也可能会丢失。匹配实验数据的关键是在流体模拟中包括临时可调参数。必要的是，直到最近由于计算局限性，这是不切实际的，这是第一原则高维动力学计算，可以使用动力学物理学来最终解决是否可以解释实验和水动力法规之间的差异。本研究将包括使用新颖的，连续的运动，高阶精度和计算有效算法的第一原理动力学计算，以在高能力密度等离子体中的流体动力学和磁动力学不稳定的情况下研究血浆动力学和运输。该项目将解决高能密度实验和仿真之间的长期差异，因此，可以显着提高我们对等离子体传输的理解，在许多研究领域的影响中都具有影响。该奖项反映了NSF的法定任务，并认为通过基金会的知识分子和更广泛的影响，可以通过评估来进行评估，以审查Criteria。