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.

该奖项促进了使用IBM开发的名为Blue沃茨的大型新计算资源的科学研究，并计划于2011年在伊利诺伊大学部署。 它提供差旅费，以支持主要调查人员、蓝色沃茨项目小组和供应商技术小组之间的技术协调，该项目涉及编制数字代码，在蓝色沃茨上运行，以研究早期巨恒星生命末期氦闪光事件的过程。 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星星内部挖掘出富含重元素的物质，并在星星被驱逐时将它们与外层混合，形成行星状星云。 该计划是首先以高分辨率对这一剧烈燃烧阶段进行短期的3D全球模拟，以捕捉未燃烧的氢进入氦对流区的湍流夹带。 这些高分辨率计算的输出的统计分析将提供亚网格尺度的参数化的湍流，多流体夹带，混合和核燃烧，然后可以纳入较粗的分辨率模型。 较粗的分辨率模型与参数化的较小尺度的卷吸和湍流燃烧，然后将集成在更长的时间内，以确定氦闪光的演变。 该项目还涉及使用一种新的技术来组织Blue沃茨处理器上的计算工作，以更有效地使用它们的计算能力。 如果成功的话，拟议中的关于蓝色沃茨的工作将为宇宙中重元素的起源和扩散提供深入的见解。 它还可以提供一种计算技术，这将有利于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。