An Approximate Method for the Drags of Two-Dimensional Obstacles at Low Reynolds Numbers

[+] Author and Article Information
Hideo Yano, Katsuya Hirata

Department of Mechanical Engineering, Doshisha University, Koyoto 610-03, Japan

Masanori Komori

Appliance System Group, Sharp Corporation, Osaka 581, Japan

J. Appl. Mech 63(4), 990-996 (Dec 01, 1996) (7 pages) doi:10.1115/1.2787257 History: Received November 28, 1994; Revised July 07, 1996; Online October 26, 2007


We propose a new simple method of computing the drag coefficients of two-dimensional obstacles symmetrical to the main-flow axis at Reynolds numbers less than 100. The governing equations employed in this method are the modified Oseen’s linearized equation of motion and continuity equation, and the computation is based on a discrete singularity method. As examples, simple obstacles such as circular cylinders, rectangular prisms, and symmetrical Zhukovskii aerofoils are considered. And it was confirmed that the computed drags agree well with experimental values. Besides optimum shapes of these geometries, which minimize the drag coefficients, are also determined at each Reynolds number.

Copyright © 1996 by The American Society of Mechanical Engineers
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