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

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 Blue Waters 的大型新型计算资源促进科学研究，计划于 2011 年在伊利诺伊大学部署。它提供差旅费，以支持主要研究人员、Blue Waters 项目团队和该项目涉及准备在 Blue Waters 上运行的数字代码，以研究早期巨星在生命即将结束时的氦闪事件过程。 这种持续时间相对较短（例如两年）的加速核燃烧事件可以从恒星内部挖掘出富含较重元素的物质，并在恒星被排出时将它们与恒星的外壳混合，形成行星状星云。 该计划首先以高分辨率对这种剧烈燃烧阶段进行短时间的 3D 全局模拟，以捕获未燃烧的氢气湍流夹带进入氦对流区的情况。 对这些高分辨率计算输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化，然后可以将其纳入较粗分辨率的模型中。 然后，具有较小尺度夹带和湍流燃烧参数化的较粗分辨率模型将在更长的时间内进行积分，以确定氦闪的演变。 该项目还涉及使用一种新技术来组织 Blue Waters 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，拟议的“蓝水”工作将有助于深入了解宇宙中重元素的起源和扩散。 它还可以提供一种计算技术，使许多需要有效利用新兴的超大型并行多核计算系统的研究领域受益。