Coherent Structures and Mixing in Rotating and Stratified Flows

旋转流和分层流中的相干结构和混合

• 批准号: 1437857
• 负责人: Susan Kurien
• 金额: $ 29.33万
• 依托单位: New Mexico Consortium
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2014
• 资助国家: 美国
• 起止时间: 2014-10-01 至 2018-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1437857&HistoricalAwards=false
• 关键词: Coherent; Structures; Mixing; Rotating; Stratified

This is a proposal to explore and model the structure of turbulence that leads to mixing in turbulent flows. The work will focus on cases of anisotropic turbulence, an area that has not been explored as much as other turbulent flows, but is of the utmost importance in engineering and in the environment. The research proposed in this work covers computations at a multitude of scales, even scales relevant to geophysical flows, allowing the results to be useful not only because of the fundamental aspect of turbulent mixing, but also due to applicability in practical situations. Our climate, agriculture, and commerce are affected by turbulence in the atmosphere and in the ocean. This work could lead to more accurate models for ocean and atmospheric flows with impact on policy, economic and infrastructure decision. The data that will be generated will become available to the scientific community through the established Johns Hopkins University Turbulence Database. In addition, graduate students will participate in this project. The goal of the proposed study is to investigate rotation and stratification effects and the scales at which different mixing dynamics are active in a turbulent flow. The PI proposes to use state-of-the-art direct numerical simulations (DNS) code and to run several large calculations using computational resources that are quite impressive (available through allocations from the DOE Office of Science). The proposed work aims to advance our fundamental understanding of turbulent mixing by, 1) characterizing and quantifying the instrinsic scales of coherent structures formed in canonical rotating and stratified flows using statistical measures and, 2) quantifying the relationship of the scales thus recovered to the statistics and the instrinsic scales of mixing.

这是一项探索和模拟导致湍流混合的湍流结构的提案。这项工作将重点关注各向异性湍流的情况，这一领域尚未像其他湍流那样被探索得那么多，但在工程和环境中至关重要。这项工作提出的研究涵盖了多种尺度的计算，甚至是与地球物理流相关的尺度，使得结果变得有用，不仅因为湍流混合的基本方面，而且因为在实际情况中的适用性。我们的气候、农业和商业受到大气和海洋湍流的影响。这项工作可以产生更准确的海洋和大气流动模型，对政策、经济和基础设施决策产生影响。将生成的数据将通过已建立的约翰·霍普金斯大学湍流数据库提供给科学界。此外，研究生也将参与该项目。拟议研究的目标是研究旋转和分层效应以及不同混合动力学在湍流中活跃的尺度。 PI 建议使用最先进的直接数值模拟 (DNS) 代码，并使用令人印象深刻的计算资源（可通过美国能源部科学办公室的分配获得）运行多项大型计算。拟议的工作旨在通过以下方式增进我们对湍流混合的基本理解：1）使用统计测量来表征和量化规范旋转和分层流中形成的相干结构的固有尺度，2）量化由此恢复到统计数据的尺度关系以及混合的内在尺度。