Scaling and Dynamics of Boundary Layer Turbulence

建议编号：CTS-0407932研究人员：Joseph C.KLEWICKIINSTUTION：UTAHSCALING和边界层涡流动力学研究建议的研究是基于犹他州西部沙漠的表面层湍流和环境科学试验(SLTEST)设施在非常高的雷诺数下进行的直接经验观测，以及直接基于平均动量方程性质的最新发展的湍流壁流理论基础。关于这两个问题，一个核心的技术主题是理解和描述产生雷诺应力梯度所涉及的运动的行为。根据这一信息，设计了一系列实验来解决与壁面湍流有关的基本问题，这些实验包括：1)内/外相互作用，2)相干运动动力学与平均动量输运之间的联系，3)平均流动结构与湍流量尺度之间的联系。这项工作将侧重于后一项工作，主要内容是在SLTEST设施进行进一步的测量。这一新开发的理论最大的影响很可能与改进的湍流统计能力有关。SLTEST设施的实验产生了非常广泛和长期的影响。这种广度源于国际和平研究所努力鼓励其他人参加每年一度的实地试验，从而获得与合作相关的技术利益和高研究生产率方面的高水平效率。长期影响源于这样一个事实，即该设施提供了在高雷诺数下产生分辨率良好的湍流测量的独特能力，这在目前的任何实验室设施中都是不可用的。除了研究生研究人员，PI预计还会有REU项目资助的本科生参与。本科生已被证明是年度实地试验研究工作的一个特别重要的组成部分。研究结果将通过国家科学基金会ITR赠款下开发的网站向研究界传播和广泛获取。

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.