Petascale Simulation of Turbulent Stellar Hydrodynamics

恒星湍流流体动力学的千万亿次模拟

• 批准号: 0832618
• 负责人: Paul Woodward
• 金额: $ 4万
• 依托单位: University of Minnesota-Twin Cities
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2009
• 资助国家: 美国
• 起止时间: 2009-10-01 至 2014-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0832618&HistoricalAwards=false
• 关键词: Petascale; Simulation; Turbulent; Stellar; Hydrodynamics; Petascale; Simulation; Turbulent; Stellar; Hydrodynamics

This award facilitates scientific research using the large new computational resource named Blue Waters being developed by IBM and scheduled to be deployed at the University of Illinois in 2011. It provides travel funds to support technical coordination between the principal investigators, the Blue Waters project team and vendor technical team.The project involves preparing numerical codes to be run on Blue Waters in a study of the course of helium flash events in early generation giant stars near the end of their lives. This relatively short duration (e.g. two years) event of accelerated nuclear burning can dredge up material enriched with heavier elements from the interior of the star and mix them with the outer envelope of the star as the latter is expelled, forming a planetary nebula. The plan is to first execute 3D, global simulations of this violent burning phase for short periods at high resolution to capture the turbulent entrainment of unburned hydrogen into the helium convection zone. Statistical analysis of the output from these high-resolution calculations will provide subgrid-scale parameterizations of turbulent, multifluid entrainment, mixing and nuclear burning that can then be incorporated in coarser resolution models. The coarser resolution models with parameterizations of the smaller scales of entrainment and turbulent combustion will then be integrated over much longer periods to determine the evolution of the helium flash. The project also involves using a novel technique to organize the computational work on the Blue Waters processors to use their computational power more effectively. If successful, the proposed work on Blue Waters will provide insights into the origin and dispersal of heavy elements in the universe. It could also provide a computational technique that would benefit a number of areas of research that need to make efficient use of the emerging class of very large, parallel, multi-core computing systems.

该奖项利用IBM开发的名为“蓝色水域”的大量新计算资源促进了科学研究，并计划于2011年在伊利诺伊大学部署。它提供了旅行资金，以支持主要研究人员，Blue Waters Project Team团队和供应商技术团队之间的技术协调。该项目涉及在蓝水中启动的数字代码，该项目涉及蓝水的生产范围。 这种相对较短的持续时间（例如两年）加速核燃烧的事件可以疏散材料，富含恒星内部的较重元素，并随着恒星的外膜混合，随着后者的排出，形成了行星星云。 该计划是在高分辨率的短时间内首先执行对这个暴力燃烧阶段的3D模拟，以捕获未燃烧的氢气进入氦对流区域的湍流。 对这些高分辨率计算的产出的统计分析将提供湍流，多流体夹带，混合和核燃烧的亚网格尺度参数，然后可以将其纳入更粗的分辨率模型中。 然后将在更长的时间内集成具有较小夹带和湍流燃烧尺度的参数化的粗分辨率模型，以确定氦闪光灯的演变。 该项目还涉及使用一种新技术来组织蓝色水域处理器上的计算工作，以更有效地利用其计算能力。 如果成功的话，蓝色水域的拟议工作将提供有关宇宙中沉重元素的起源和散布的见解。 它还可以提供一种计算技术，该技术将使许多研究领域受益，这些研究需要有效利用非常大型，平行，多核计算系统的新兴类别。