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The effects of nose-shape and upstream flow separation on the wake of a cylindrical square-backed body
Experimental Thermal and Fluid Science ( IF 3.2 ) Pub Date : 2020-10-01 , DOI: 10.1016/j.expthermflusci.2020.110142
Gershom Easanesan , David Burton , Mark C. Thompson

Abstract An experimental study was conducted on flow around two-dimensional, square-backed bluff bodies in the presence of a ground plane. Two frontal geometries were tested: one with significant leading-edge separation and one without. The extensive leading-edge separation was found to induce significant asymmetry in the time-averaged wake. One-sided shedding from the top trailing edge was found to occur in the absence of significant separation, but broad-spectrum turbulence was found to be responsible for much of the fluctuating energy. More pronounced upstream separation was found to further inhibit regular shedding of large-scale structures in the wake. Over the range considered, a degree of Reynolds number sensitivity was observed, with the boundary layer along the ground plane separating upstream of the body at low Reynolds numbers. The effect of increasing the ground clearance was also considered, which weakened the leading-edge separation whilst increasing the prominence of vortex shedding.

中文翻译:

鼻形和上游流分离对圆柱方背体尾流的影响

摘要 对存在地平面的二维方背钝体周围的流动进行了实验研究。测试了两种正面几何形状:一种具有显着的前缘分离,另一种没有。发现广泛的前缘分离会在时间平均尾流中引起显着的不对称。在没有明显分离的情况下发现从顶部后缘的一侧脱落,但发现广谱湍流是造成大部分波动能量的原因。发现更明显的上游分离进一步抑制尾流中大型结构的定期脱落。在所考虑的范围内,观察到一定程度的雷诺数敏感性,沿着地平面的边界层在低雷诺数下分离身体的上游。
更新日期:2020-10-01
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