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首页> 外文期刊>Physics of fluids >Direct numerical simulation of flow around a surface-mounted finite square cylinder at low Reynolds numbers
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Direct numerical simulation of flow around a surface-mounted finite square cylinder at low Reynolds numbers

机译：低雷诺数的表面安装有限平方圆柱周围的直接数值模拟

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摘要

With the aid of direct numerical simulation, this paper presents a detailed investigation on the flow around a finite square cylinder at a fixed aspect ratio (AR) of 4 and six Reynolds numbers (Re = 50, 100, 150, 250, 500, and 1000). It is found that the mean streamwise vortex structure is also affected by Re, apart from the AR value. Three types of mean streamwise vortices have been identified and analyzed in detail, namely, "Quadrupole Type" at Re = 50 and Re = 100, "Six-Vortices Type" at Re = 150 and Re = 250, and "Dipole Type" at Re = 500 and Re = 1000. It is the first time that the "Six-Vortices Type" mean streamwise vortices are reported, which is considered as a transitional structure between the other two types. Besides, three kinds of spanwise vortex-shedding models have been observed in this study, namely, "Hairpin Vortex Model" at Re = 150, "C and Reverse-C and Hairpin Vortex Model (Symmetric Shedding)" at Re = 250, and "C and Reverse-C and Hairpin Vortex Model (Symmetric/Antisymmetric Shedding)" at Re = 500 and Re = 1000. The newly proposed "C and Reverse-C and Hairpin Vortex Model" shares some similarities with "Wang's Model" [H.F. Wang and Y. Zhou, " The finite-length square cylinder near wake," J. Fluid Mech. 638, 453-490 (2009)] but differs in aspects such as the absence of the connection line near the free-end and the "C-Shape" vortex structure in the early stage of the formation of the spanwise vortex. Published by AIP Publishing.
机译：借助于直接数值模拟，本文介绍了4个和六个雷诺数（RE = 50,100,150,250,500，500，500，500，500和1000）。发现平均流动涡旋结构也受重新的影响，除了AR值。已经详细识别和分析了三种类型的平均流涡流，即“四极型”在Re = 50和Re = 100，“六涡旋类型”在Re = 150和Re = 250处，以及“偶极型” Re = 500和Re = 1000.首次报告了“六涡旋类型”是指均值流动涡流，这被认为是另外两种类型之间的过渡结构。此外，在该研究中观察到三种血管涡旋脱落模型，即“发夹涡旋模型”在RE = 150，“C和REVERSE-C和发夹涡流模型（对称脱落）”在RE = 250，以及“C和recerse-c和发夹涡旋模型（对称/反对称脱落）”在重新= 500并且重新= 1000.新提出的“C和Reverse-C和发夹模型”与“王的模型”分享了一些相似之处[HF王和Y.周，“尾尾有限长度方圆柱”，J. Fluid Mech。 638,453-490（2009）]但在方面不同，例如在自由端和“C形”涡旋结构附近的连接线和“C形”涡旋结构的形成在形成翼展涡旋的早期阶段。通过AIP发布发布。

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  • 来源
    《Physics of fluids》 |2017年第4期|共24页
  • 作者

    Zhang Di; Cheng Liang; An Hongwei; Zhao Ming;

  • 作者单位

    Univ Western Australia Sch Civil Environm &

    Min Engn 35 Stirling Highway Crawley WA 6009 Australia;

    Univ Western Australia Sch Civil Environm &

    Min Engn 35 Stirling Highway Crawley WA 6009 Australia;

    Univ Western Australia Sch Civil Environm &

    Min Engn 35 Stirling Highway Crawley WA 6009 Australia;

    Western Sydney Univ Sch Comp Engn &

    Math Locked Bay 1797 Penrith NSW 2751 Australia;

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  • 正文语种 eng
  • 中图分类 流体力学;
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