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Relation between shear parameter and Reynolds number in statistically stationary turbulent shear flows

机译:剪切参数与雷诺数之间的关系   静止湍流剪切流

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摘要

Studies of the relation between the shear parameter S^* and the Reynoldsnumber Re are presented for a nearly homogeneous and statistically stationaryturbulent shear flow. The parametric investigations are in line with ageneralized perspective on the return to local isotropy in shear flows that wasoutlined recently [Schumacher, Sreenivasan and Yeung, Phys. Fluids, vol.15, 84(2003)]. Therefore, two parameters, the constant shear rate S and the level ofinitial turbulent fluctuations as prescribed by an energy injection rateepsilon_{in}, are varied systematically. The investigations suggest that theshear parameter levels off for larger Reynolds numbers which is supported bydimensional arguments. It is found that the skewness of the transversederivative shows a different decay behavior with respect to Reynolds numberwhen the sequence of simulation runs follows different pathways across thetwo-parameter plane. The study can shed new light on different interpretationsof the decay of odd order moments in high-Reynolds number experiments.
机译:对于近似均匀且统计上稳定的湍流剪切流,研究了剪切参数S ^ *与雷诺数Re之间的关系。参数研究与最近概述的关于剪切流返回局部各向同性的概括观点相一致[Schumacher,Sreenivasan和Yeung,Phys。流体,第15卷,84(2003)]。因此,两个参数,恒定的剪切速率S和由能量注入速率ε_in规定的初始湍流波动的水平被系统地改变。研究表明,对于较大的雷诺数,剪切参数会趋于平稳,这由尺寸参数支持。研究发现,当模拟序列遵循跨两参数平面的不同路径时,横向导数的偏度相对于雷诺数表现出不同的衰减行为。该研究可以为高雷诺数实验中奇数阶矩衰减的不同解释提供新的思路。

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  • 作者

    Schumacher, Joerg;

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  • 年度 2004
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  • 原文格式 PDF
  • 正文语种 {"code":"en","name":"English","id":9}
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