A PENULTIMATE PETASCALE COMPUTATIONAL LABORATORY FOR TURBULENCE AND MAGNETOHYDRODYNAMIC TURBULENCE

倒数第二个千万亿次湍流和磁流体动力湍流计算实验室

基本信息

批准号：
1640771
负责人：
Pui-Kuen Yeung
金额：
$ 1.67万
依托单位：
Georgia Tech Research Corporation
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2016
资助国家：
美国
起止时间：
2016-09-01 至 2019-08-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1640771&HistoricalAwards=false
关键词：
PENULTIMATE PETASCALE COMPUTATIONAL LABORATORY TURBULENCE

项目摘要

The objective of this project is to use the Blue Waters supercomputer to enable lasting contributions to the study of scale similarity in turbulent flows at high Reynolds number, and of the behavior of turbulent flows subjected to an external magnetic field and solid-body rotation. Advanced post and on-the-fly processing techniques are to be applied to extract unique physical insights from the largest turbulence simulation to date (over half a trillion grid pints) aimed at fine-scale structure, made possible through a priorPRAC allocation. A careful choice of parameters and initial conditions will allow the first numerical simulation of the response of turbulence with a classical inertial range to the forces of electromagnetic induction as well as uniform solid-body rotation. The project is expected to be of great impact for many fields of research such as meteorology, combustion, wind power, where intermittent outbursts of strong turbulence must be considered. Additionally, studying the combined effects of magnetic fields and solid-body rotation on a turbulent flow will provide crucial steps for our understanding how the Earth's magnetic field arises. Furthermore, by providing new data generated from this project, the impact on fundamental turbulence research is likely to be transformative.The search for conclusive results on the problem of refined scale similarity applicable to high Reynolds number turbulent flows in diverse geometries has long been a grand challenge in turbulence theory. The intellectual merit of the proposed research lies in part in the rigorous analysis of high-resolution simulation data that has finally shown promise of enabling a penultimate description in this pursuit. Time-resolved dynamical information on extreme events in connection to vortical structures will in particular be new especially at the high Reynolds number possible on Blue Waters. For magnetohydrodynamic (MHD) turbulence the new simulations are expected to meet the challenge of understanding the flow physics while meeting competing demands for higher Reynolds number, domain size especially along the direction of an imposed magnetic field, and different time scales associated with the strength of the latter. Consideration of the coupling MHD turbulence with solid-body rotation also raises many further complexities, for which the proposed simulations will provide a basic characterization previously not available in the literature. Finally, sustained access to Blue Waters will provide doctoral students in this project with opportunities towards becoming leaders in the next generation of computational scientists.

该项目的目的是使用蓝色水域超级计算机来对高雷诺数下湍流的比例相似性以及经受外部磁场和固体旋转的湍流行为进行持久贡献。高级邮政处理技术和直接处理技术应应用于迄今为止最大的湍流模拟（超过半数以上网格品脱），该洞察力是针对精细规模结构的，通过先验分配使其成为可能。仔细选择参数和初始条件将允许对具有经典惯性范围对电磁诱导力以及均匀的固体旋转力的湍流的响应进行首次数值模拟。预计该项目将对许多研究领域（例如气象，燃烧，风能）产生重大影响，在这种研究中，必须考虑强烈的湍流爆发。此外，研究磁场和固体旋转对湍流的综合效应将为我们理解地球磁场的产生方式提供关键步骤。此外，通过提供该项目产生的新数据，对基本湍流研究的影响很可能是变革性的。在各种几何形状中，适用于高雷诺数的精制量表相似性问题的结论结果长期以来一直是湍流理论中的巨大挑战。拟议研究的智力优点部分在于对高分辨率仿真数据的严格分析，该数据最终显示出在这种追求中实现倒数第二个描述的希望。有关与涡流结构有关的极端事件的时间分辨的动态信息，尤其是在蓝色水上可能的高雷诺数上是新的。对于磁水动力学（MHD）湍流，新模拟有望应对了解流体物理的挑战，同时满足较高雷诺数的竞争需求，域的大小，尤其是沿施加的磁场的方向以及与后者强度相关的不同时间尺度。考虑使用实体旋转的耦合MHD湍流也提高了许多复杂性，为此，所提出的模拟将提供以前在文献中无法获得的基本表征。最后，持续进入蓝色水域将为该项目的博士学生提供成为下一代计算科学家的领导者的机会。