Computation of Vortex Lock-In in the Laminar Wake of a Circular Cylinder Using Unsteady Monopole Sources

[+] Author and Article Information
Dartzi Pan, Yu-Chi Chin, Chih-Hao Chang

Institute of Aeronautics and Astronautics, National Cheng Kung University, Tainan, Taiwan, Republic of China

J. Fluids Eng 117(2), 227-233 (Jun 01, 1995) (7 pages) doi:10.1115/1.2817134 History: Received August 10, 1993; Revised May 11, 1994; Online December 04, 2007


The vortex lock-in in the laminar wake behind a circular cylinder induced by the unsteady monopole source is numerically simulated in this paper. The artificial compressibility method is employed to solve the incompressible Navier-Stokes equations. A high-order accurate upwind flux-difference finite-volume scheme is used to discretize the flow field. The unsteady monopole source is simulated by a pulsating volume flux through the cylinder surface at a prescribed forcing frequency and amplitude. The forcing amplitude is set to a fixed value while the frequency is varied to search for the lock-in region. The flow field of the periodic lock-in state is examined in detail. Finally, the effects of a higher amplitude and a different source location are briefly investigated.

Copyright © 1995 by The American Society of Mechanical Engineers
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