Mean wake and aerodynamic forces for surface-mounted finite-height square prisms of very small aspect ratio

唤醒 物理 斯特劳哈尔数 雷诺数 阻力系数 边界层 涡度 空气动力 机械 棱镜 阻力 光学 边界层厚度 旋涡脱落 几何学 空气动力学 涡流 湍流 数学
作者
Bárbara L. da Silva,Dylan G. H. Hahn,David S. Sumner,Donald J. Bergstrom
出处
期刊:Physics of Fluids [American Institute of Physics]
卷期号:34 (11) 被引量:13
标识
DOI:10.1063/5.0123259
摘要

The mean flow field, aerodynamic forces, bending moment and Strouhal number (St) were investigated for isolated surface-mounted finite-height square prisms of very small aspect ratio (AR). The Reynolds number was Re =7.5×104 for the velocity measurements and 9×104 for the force, bending moment and St measurements. Prisms with AR = 0.5, 0.7 and 1 were considered, under two different boundary layer thicknesses of δ/D=0.7–0.8 (thin) and δ/D=1.3 (thick). For both boundary layers, the mean drag force coefficient showed a sharper increase with AR compared with taller prisms, and the mean normal force coefficient increased smoothly, with a lower magnitude than pressure-based normal force coefficients. An approximately constant point of action of the drag force was found for AR < 1. While the thick boundary layer caused the spectral peaks to weaken and St to decrease, some periodicity was still found for all AR. These features were connected to the changes in the mean wake of the prisms with AR and δ/D. A smaller AR and larger δ/D had similar effects, causing the wake to shorten, the probability and type of reattachment of the flow on the free end to change, and the mean wake structure to transition from a streamwise wake vorticity pattern to an inner vorticity pattern. The prism with AR = 1 showed a dipole wake structure similar to that of taller prisms, while the unique wake topology of prisms with AR < 1 was found to be responsible for the different force and St trends identified in this range of AR.
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