CDS&E: AST: Collaborative Research: Computational science in support of space missions: plasma turbulence modeling on geodesic meshes

CDS

基本信息

批准号：
2009776
负责人：
Dinshaw Balsara
金额：
$ 25万
依托单位：
University of Notre Dame
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2020
资助国家：
美国
起止时间：
2020-09-01 至 2024-08-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=2009776&HistoricalAwards=false
关键词：
CDS&E AST Collaborative Research Computational

项目摘要

In situ and remote observations in the solar wind and other astrophysical environments reveal that the plasma invariably possesses anisotropic temperatures. This requires non-ideal magnetohydrodynamics (MHD), but so far there has been no consistent approach to modeling the necessary physics. The most significant open question in heliophysics is to explain the extraordinarily high temperature of the solar corona and hence the origin of the solar wind. Forthcoming observations should provide a wealth of new information, but interpretation is likely to find current theory considerably wanting. This project will go beyond the MHD approximation using the most sophisticated computational algorithms and combining the unique strengths of the research team. The calculational tools developed to analyze solar activity will yield a better understanding of how solar storms arise and thus enhance predictive space weather capabilities. The research team is heavily involved in the teaching and dissemination of computational physics with significant workforce development impact.Recent advances in plasma theory provide closures of the fluid hierarchy incorporating anisotropic pressures, reproducing linear Landau damping to any desired precision, and demonstrating convergence of the fluid and collisionless kinetic descriptions. This work will integrate an advanced description of the coronal and inner heliosphere plasma into models of wave propagation, turbulence transport, and anisotropic heating. It will enable solution of the Chew-Goldberger-Low (CGL) equations, including a Hall term, on adaptive, spherical meshes with physics-based turbulent closures. This involves three highly innovative tasks: 1) a correct treatment of the Hall-CGL equations; 2) development of adaptive mesh refinement for spherical meshes; 3) a weakly compressible model for turbulence which enables a physics-based estimate of the transport coefficients for anisotropic thermal conduction in plasmas with anisotropic pressure distributions. The resulting code will take the astrophysics and space science communities to the next level of sophistication in modeling astrophysical plasmas.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.

对太阳风和其他天体物理环境的现场和远程观测表明，等离子体总是具有各向异性温度。这需要非理想磁流体动力学 (MHD)，但迄今为止还没有一致的方法来对必要的物理进行建模。太阳物理学中最重要的悬而未决的问题是解释日冕的异常高温以及太阳风的起源。即将进行的观察应该会提供大量新信息，但解释可能会发现当前的理论相当不足。该项目将超越 MHD 近似，使用最复杂的计算算法并结合研究团队的独特优势。为分析太阳活动而开发的计算工具将更好地了解太阳风暴是如何产生的，从而增强预测空间天气的能力。该研究团队积极参与计算物理的教学和传播，对劳动力发展产生重大影响。等离子体理论的最新进展提供了包含各向异性压力的流体层次结构的闭合，以任何所需的精度再现线性朗道阻尼，并演示了流体的收敛和无碰撞动力学描述。这项工作将对日冕和内部日光层等离子体的高级描述整合到波传播、湍流传输和各向异性加热模型中。它将能够在具有基于物理的湍流闭合的自适应球形网格上求解 Chew-Goldberger-Low (CGL) 方程，包括霍尔项。这涉及三个高度创新的任务：1）正确处理 Hall-CGL 方程； 2) 球面网格自适应网格细化的开发； 3) 湍流的弱可压缩模型，能够基于物理估计具有各向异性压力分布的等离子体中各向异性热传导的传输系数。由此产生的代码将使天体物理学和空间科学界在天体物理等离子体建模方面更上一层楼。该奖项反映了 NSF 的法定使命，并通过使用基金会的智力价值和更广泛的影响审查标准进行评估，被认为值得支持。

项目成果

期刊论文数量（7）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

Techniques, Tricks, and Algorithms for Efficient GPU-Based Processing of Higher Order Hyperbolic PDEs

基于 GPU 高效处理高阶双曲偏微分方程的技术、技巧和算法

DOI：
10.1007/s42967-022-00235-9
发表时间：
2023
期刊：
Communications on Applied Mathematics and Computation
影响因子：
1.6
作者：
Subramanian, Sethupathy;Balsara, Dinshaw S.;Bhoriya, Deepak;Kumar, Harish
通讯作者：
Kumar, Harish

An Optimized CPML Formulation for High Order FVTD Schemes for CED

CED 高阶 FVTD 方案的优化 CPML 公式

DOI：
10.1109/jmmct.2021.3128449
发表时间：
2021
期刊：
IEEE Journal on Multiscale and Multiphysics Computational Techniques
影响因子：
2.3
作者：
Balsara, Dinshaw S.;Samantaray, Saurav;Niknam, Kaiser;Simpson, Jamesina J.;Montecinos, Gino
通讯作者：
Montecinos, Gino

A simplified Cauchy-Kovalewsky procedure for the implicit solution of generalized Riemann problems of hyperbolic balance laws

双曲平衡律广义黎曼问题隐式解的简化 Cauchy-Kovalewsky 过程