RESEARCH PAPERS: Offshore Mechanics

Vortex Trajectories Around a Circular Cylinder in Oscillatory Plus Mean Flow

[+] Author and Article Information
T. Sarpkaya, C. Putzig, D. Gordon

Department of Mechanical Engineering, Naval Postgraduate School, Monterey, CA 93943

X. Wang, C. Dalton

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

J. Offshore Mech. Arct. Eng 114(4), 291-298 (Nov 01, 1992) (8 pages) doi:10.1115/1.2919983 History: Received August 07, 1992; Online June 12, 2008


The vorticity-stream function equations and a third-order in time, second-order in space, three-level predictor-corrector finite-difference scheme has been used to carry out numerical experiments on laminar pulsatile flow (with nonzero mean). The results have revealed, for the first time, the existence of a very interesting wake comprised of three rows of heterostrophic vortices at certain Keulegan-Carpenter numbers and relative current velocities. The existence of such a street has been vindicated by physical experiments. The calculations have also shown that the drag and inertia coefficients for K=4–6 are in reasonable agreement with those obtained experimentally at corresponding relative current velocities.

Copyright © 1992 by The American Society of Mechanical Engineers
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