Interaction of a steady approach flow and a circular cylinder undergoing forced oscillation
- Univ. of Houston, TX (United States). Dept. of Mechanical Engineering
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 viscosity dominated flows with different dimensionless amplitude (a) and frequency (f{sub c}) of the oscillation of the cylinder show a strong effect of the oscillation when f{sub c} is close to f{sub so}, 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 from 1.0 to 2.0, f{sub c}/f{sub so} from 0.85 to 1.7. For Re = 855, a = 0.26, lock-on is not observed due to the smaller amplitude of oscillation. However, the effect of oscillation shows clearly in the strong modification of the drag and lift coefficients. Lock-on, however, is observed for a = 1 at Re = 855 where the drag and coefficients are both enhanced over the stationary cylinder values.
- OSTI ID:
- 55698
- Report Number(s):
- CONF-940230--; ISBN 0-7918-1264-2
- Country of Publication:
- United States
- Language:
- English
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