Interaction of a Steady Approach Flow and a Circular Cylinder Undergoing Forced Oscillation

[+] Author and Article Information
Jianfeng Zhang

Department of Mechanical Engineering, University of Houston, Houston, TX 77204-4814

Charles Dalton

University of Houston, Houston, TX 77204-4814

J. Fluids Eng 119(4), 808-813 (Dec 01, 1997) (6 pages) doi:10.1115/1.2819502 History: Received December 06, 1994; Revised July 08, 1997; Online January 22, 2008


This paper presents a numerical study on the interaction of a steady approach flow and the forced transverse oscillation of a circular cylinder. The two-dimensional stream-function/vorticity formulation of the Navier-Stokes equations is solved by a semi-implicit finite-difference scheme. Calculations for flows with different amplitude (a) and frequency (fc ) of the oscillation of the cylinder show a strong effect of the oscillation when fc is close to fso , the vortex shedding frequency, of the stationary cylinder. Lock-on of vortex shedding, distinct flow patterns, and increase in both drag and lift coefficients from those of a stationary cylinder are observed for Reynolds number Re = 200, a/R (R is the radius of the cylinder) from 1.0 to 2.0, fc /fso from 0.85 to 1.7. For Re = 855, a/R = 0.26, a large eddy simulation model for turbulent flow is used. The results at Re = 855 and a/R = 0.26 show that lock-on has occurred for fc /fso ≥ 0.85. The behavior of the drag and lift coefficients is seen to be influenced by the lock-on phenomenon.

Copyright © 1997 by The American Society of Mechanical Engineers
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