Drag on a Cylinder with an Apple-Shaped Cross Section
Drag on a Cylinder with an Apple-Shaped Cross Section作者机构：Graduate School of Biomedical Engineering Toyo University Saitama Japan Faculty of Science and Engineering Toyo University Saitama Japan Daikirika Kogyo Inc. Saitama Japan Department of Biomedical Engineering Toyo University Saitama Japan
出 版 物：《World Journal of Mechanics》 (力学国际期刊（英文）)
年 卷 期：2016年第6卷第9期
页 面：323-339页
学科分类：080704[工学-流体机械及工程] 080103[工学-流体力学] 08[工学] 0807[工学-动力工程及工程热物理] 0801[工学-力学（可授工学、理学学位）]
主 题：Drag Reduction Apple Cylinder Vortex Method k-ε Model Flow Visualization
摘 要：The drag on a cylinder with an apple-shaped cross section was studied numerically in this paper. This cross section is adopted because the drag on an apple is known to be lower than that of a sphere. Since the hollows of an apple seem to be points of drag reduction, two-dimensional numerical simulations of cylinders with hollows of several shapes are carried out at a Reynolds number of 6.7 × 104 by using the vortex method to check their effects. The cylinder with hollows like those of a real apple attained a 13% reduction in drag compared with a circular cylinder. Other geometrical hollow-shapes, namely, V-shaped and U-shaped grooves, also reduced drag from the circular model, but these effects were less pronounced than those of the apple-shaped cross section. It was concluded that an apple-like hollows were effective for drag reduction of a cylin-der as well as a sphere.
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