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首页> 外文期刊>Experimental Thermal and Fluid Science: International Journal of Experimental Heat Transfer, Thermodynamics, and Fluid Mechanics >Characterization of near-wall structures in the log-region of a turbulent boundary layer by means of conditional statistics of tomographic PIV data
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Characterization of near-wall structures in the log-region of a turbulent boundary layer by means of conditional statistics of tomographic PIV data

机译：通过断层PIV数据的条件统计，湍流边界层的近壁结构的表征

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摘要

The random-in-appearance turbulent flow of boundary layers seem to display packages of organized coherent structures near the wall. The understanding of the generation and interaction of these structures and their contribution to the production and dissipation of turbulence is of great relevance to the modelling and control of wall-bounded flows. The present work is a contribution to the knowledge about organized coherent structures at the logarithmic region of turbulent boundary layers at relatively high Reynolds number. From a six-camera tomo-PIV experiment, conducted in a wind tunnel with a Reynolds number based on the momentum thickness of 8500, conditional statistics were obtained that allowed the characterization of low- and high-speed regions, ejections, sweeps and vortices. The analyses confirmed findings from previous works in the literature regarding ejection and sweep structures as being major contributors to the turbulent production, while vortices are responsible for dissipating this energy in the self-sustaining turbulent process. The vortical structures were found to be close to low-speed regions, being responsible to maintain these regions and to induce ejection and sweep events. The conditional statistics on the coherent structures at the log-region obtained in the present work were in good agreement with the literature, including statistics at the inner and outer regions of the canonical flow of a flat plate boundary layer, which suggest some possible general structure organization.
机译：边界层的随机出现湍流似乎显示在墙壁附近的有组织相干结构的包装。理解这些结构的产生和相互作用及其对湍流的生产和耗散的贡献与墙面有界流的建模和控制具有巨大的相关性。目前的作品是对湍流边界层对数雷诺数的对数区域的有组织相干结构的贡献。从六摄像头Tomo-PIV实验中，基于8500的动量厚度的雷诺数在风洞中进行，获得了条件统计，允许表征低速和高速区域，喷射，扫描和涡流。分析确认了先前作品中的研究结果，在文献中，有关喷射和扫描结构的主要贡献者，因为湍流生产的主要贡献者，而涡流负责在自我维持湍流过程中消散这种能量。发现涡旋结构接近低速区域，负责维持这些区域并诱导喷射和扫描事件。关于本作日志区域的相干结构的条件统计与文献吻合吻合良好，包括平板边界层的规范流动的内部和外部区域的统计，这表明了一些可能的一般结构组织。

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