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首页> 外文期刊>International Journal of Heat and Fluid Flow >Coherent vortical and straining structures in the finite wall-mounted square cylinder wake
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Coherent vortical and straining structures in the finite wall-mounted square cylinder wake

机译：有限壁挂式方柱尾流中的相干涡旋和应变结构

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摘要

Topological aspects of the turbulent wake of a finite, surface-mounted, square-cross-section cylinder of h/d = 4 are addressed by decomposing the velocity field into a quasi-periodic coherent part and the unresolved incoherent fluctuations. The three-dimensional large scale structure is educed through a reconstruction of planar phase-averaged PIV measurements using the simultaneously sampled surface pressure difference on opposing sides of the obstacle as a phase reference. A topological model for the vortex structure is educed and mean streamwise wake vorticity is explained in terms of the connections between initially vertical structures shed alternately from either side of the obstacle, rather than previously proposed 'tip' vortex structures generated at the obstacle free-end. The coherent structure educed accounts for a significant portion of the fluctuating energy in the wake. The turbulent field is further analyzed by finding Lagrangian straining structures that form by induction of the coherent vorticity field, and these structures are related to the energy transfer from the base phase-averaged flow since they act to stretch incoherent vorticity fluctuations in their neighbourhood.
机译：通过将速度场分解为准周期相干部分和未解决的非相干波动，可以解决h / d = 4的有限，表面安装，方形横截面圆柱体的湍流尾流的拓扑问题。通过使用在障碍物相对侧的同时采样的表面压力差作为相位参考，通过重建平面相位平均PIV测量得出三维大型结构。推导了涡旋结构的拓扑模型，并根据从障碍物任一侧交替掉落的初始垂直结构之间的联系，而不是先前提出的在障碍物自由端产生的“尖端”涡流结构，解释了平均流向尾流涡流。 。产生的相干结构占尾流中波动能量的很大一部分。通过寻找由相干涡旋场的感应而形成的拉格朗日应变结构来进一步分析湍流场，这些结构与基相平均流的能量转移有关，因为它们的作用是拉伸邻域的非相干涡旋涨落。

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  • 来源
    《International Journal of Heat and Fluid Flow》 |2012年第2012期|p.130-140|共11页
  • 作者

    J.A. Bourgeois; P. Sattari; R.J. Martinuzzi;

  • 作者单位

    Department of Mechanical and Manufacturing Engineering. University of Calgary, 2500 University Drive NW, Calgary. Alberta, Canada T2N 1N4;

    Department of Mechanical and Manufacturing Engineering. University of Calgary, 2500 University Drive NW, Calgary. Alberta, Canada T2N 1N4;

    Department of Mechanical and Manufacturing Engineering. University of Calgary, 2500 University Drive NW, Calgary. Alberta, Canada T2N 1N4;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    coherent structures; vortex shedding; finite time lyapunov exponent; turbulence production;

    机译：连贯的结构;涡旋脱落有限时间lyapunov指数;湍流产生;

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