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Fundamental studies on incompressible flat-plate boundary layer and pipe flow

Fundamental studies on incompressible flat-plate boundary layer and pipe flow
不可压缩平板边界层与管流基础研究
批准号:
341912-2010
负责人:
Wu, Xiaohua
金额:
$2.04万
依托单位国家:
加拿大
项目类别:
Discovery Grants Program - Individual
财政年份:
2011
资助国家:
加拿大
项目状态:
已结题
起止时间:
2011-01-01 至 2012-12-31

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中文摘要
翻译
光滑平板上的不可压缩零压力梯度边界层和光滑管道中的不可压缩流动是现代流体力学的两个基本组成部分。同时,它们也是飞机机翼边界层等许多复杂工程流的极限情况和标定基准。实验为在边界层和管道流动中以发夹包形式组织大尺度涡结构提供了间接证据。理论家们还假设了发夹森林的存在。令人困惑的是,在以前的不可压缩湍流边界层和管道流动模拟中,既不能检测到主导发夹包,也不能检测到发夹森林。
英文摘要
Incompressible zero-pressure-gradient boundary layer over a smooth flat-plate and incompressible flow through a smooth pipe are two fundamental building blocks of modern fluid mechanics. In the meantime, they are also the limiting cases and calibration benchmarks of many complicated engineering flows such as the boundary layer on an aircraft wing. Experiments have provided indirect evidence for the organization of large-scale vortex structures in the form of hairpin packets in the boundary layer and pipe flow. Theoreticians also hypothesized the existence of hairpin forest. Perplexingly, neither dominant hairpin packet nor hairpin forest could be detected from previous incompressible turbulent boundary layer and pipe flow simulations.
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