Visualization of flow past a square prism with cut-corners at the front-edge
Visualization of flow past a square prism with cut-corners at the front-edge
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DOI：
10.1007/bf03181881
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发表时间：
2009-12
影响因子：
1.7
通讯作者：
Y. Ueda;Mitsuo Kurata;T. Kida;M. Iguchi
中科院分区：
文献类型：
--
作者：
Y. Ueda;Mitsuo Kurata;T. Kida;M. Iguchi
通过数值模拟和实验研究了前缘带切角的方柱绕流的减阻机理。对雷诺数在200 ~ 1250之间的两种情况，采用了基于涡方法的自适应数值格式，并与实验结果进行了比较。实验显示技术包括Re = 4，000时的氢气泡技术和Re = 10，000时的油流技术（用于形成整体尾流），以及Re = 1，250时的铝片技术（用于运动初期的瞬态流）。在200和10，000之间的雷诺数的宽范围内显示了类似的再附着流型，这意味着与先前的发现不同，雷诺数约低于8，000的阻力减小的可能性。
Flow past a square prism with cut-corners at the front-edge is numerically and experimentally visualized to investigate a mechanism of drag reduction. An adaptive numerical scheme based on the vortex method is implemented for two values of the Reynolds number between 200 and 1,250, and the results are compared with experiments. Experimental visualization techniques include the hydrogen-bubble technique atRe=4,000 and the oil-flow technique atRe=10,000 for a global wake formation, and the aluminum-flake technique for transient flow at the early stage of motion atRe=1,250. A similar reattachment flow pattern is shown in a wide range of the Reynolds number between 200 and 10,000, which implies a possibility of the drag reduction in the Reynolds number being approximately lower than 8,000 unlike the previous findings.