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.

中文翻译：

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流过前端有切角的方形棱柱的可视化

流过前端有切角的方形棱柱，通过数值和实验可视化，以研究减阻机制。针对雷诺数介于200和1250之间的两个值，实施了基于涡流法的自适应数值方案，并将结果与​​实验进行了比较。实验可视化技术包括 Re=4,000 的氢气泡技术和 Re=10,000 的油流技术，用于全局尾流形成，以及铝片技术，用于在 Re=1,250 的运动早期阶段的瞬态流。雷诺数在 200 到 10,000 之间的大范围内显示出类似的再附着流动模式，这意味着与之前的发现不同，雷诺数的阻力减少可能大约低于 8,000。