Scaling and Dynamics of Boundary Layer Turbulence

边界层湍流的尺度和动力学

• 批准号: 0407932
• 负责人: Joseph Klewicki
• 金额: --
• 依托单位: University of Utah
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2005
• 资助国家: 美国
• 起止时间: 2005-04-15 至 2005-10-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0407932&HistoricalAwards=false
• 关键词: Scaling; Dynamics; Boundary; Layer; Turbulence

PROPOSAL NO.: CTS-0407932PRINCIPAL INVESTIGATOR: JOSEPH C. KLEWICKIINSTITUTION: UNIVERSITY OF UTAHSCALING AND DYNAMICS OF BOUNDARY LAYER TURBULENCEThe proposed research is motivated by the direct empirical observations derived from measurements at very high Reynolds number at the Surface Layer Turbulence and Environmental Science Test (SLTEST) facility in Utah's west desert, and upon the newly developed theoretical foundation for turbulent wall flow based directly on the properties of the mean momentum equation. With regard to both of these, a central technical theme has been the understanding and characterizing behavior of the motions involved in generating Reynolds stress gradients. With the new insights derived from this information, a set of experiments were designed to address fundamental unresolved issues concerning wall turbulence, as follows: 1) the inner/outer interaction, 2) the connections between coherent motion dynamics and mean momentum transport, and 3) the connections between mean flow structure and the scaling of turbulence quantities. The effort will focus on the latter item with a primary component devoted to further measurements at the SLTEST facility. The greatest impact of the newly developed theory will most likely be related to an improved capacity to scale turbulence statistics. Experiments at the SLTEST facility have very broad and long-term impact. The breadth stems from the efforts of the PI to encourage others to join the yearly field experiments, and thus gain a high level of efficiency relating to both the technical benefits associated with collaborations, and in terms of high research productivity. The long-term impact derives from the fact that the facility offers unique capabilities to produce well-resolved turbulence measurements at high Reynolds numbers which are unavailable in any current laboratory facility. In addition to graduate student researchers, the PI anticipates involving undergraduate students funded under the REU program. Undergraduates have proven to be an especially important component to the yearly field trial research effort. The results will be disseminated and widely accessible to the research community via a web site developed under an NSF ITR grant.

提案编号：CTS-0407932 主要研究员：JOSEPH C. KLEWICKI 机构：犹他大学边界层湍流尺度化和动力学这项研究的动机是通过犹他州西部表层湍流和环境科学测试 (SLTEST) 设施的极高雷诺数测量得出的直接经验观察结果沙漠和新开发的 直接基于平均动量方程的性质的湍流壁流的理论基础。 对于这两者，一个中心技术主题是理解和表征生成雷诺应力梯度所涉及的运动的行为。 根据从这些信息中得出的新见解，设计了一组实验来解决有关壁湍流的基本未解决问题，如下：1）内/外相互作用，2）相干运动动力学与平均动量传输之间的联系，3）平均流动结构与湍流量缩放之间的联系。 这项工作将集中在后一个项目上，其主要部分致力于在 SLTEST 设施上进行进一步测量。 新发展的理论的最大影响很可能与扩展湍流统计的能力的提高有关。 SLTEST 设施的实验具有非常广泛和长期的影响。 这种广度源于 PI 鼓励其他人加入年度现场实验的努力，从而获得与合作相关的技术效益和高研究生产力方面的高效率。长期影响源于这样一个事实：该设施提供了独特的能力，可以在高雷诺数下产生高分辨率的湍流测量结果，这是当前任何实验室设施所不具备的。 除了研究生研究人员外，PI 预计还包括 REU 计划资助的本科生。事实证明，本科生是年度现场试验研究工作中特别重要的组成部分。 结果将通过 NSF ITR 资助开发的网站向研究界传播和广泛获取。