Author： Al-Mdallal Qasem M. Kocabiyik Serpil
Publisher： Taylor & Francis Ltd
ISSN： 1061-8562
Source： International Journal of Computational Fluid Dynamics, Vol.20, Iss.5, 2006-06, pp. : 293-299
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Abstract
The laminar unsteady periodic flow motion found in the wake of a rotationally oscillating circular cylinder is investigated numerically at a Reynolds number of 855 over a wide range of oscillation amplitude and frequency ratio. The governing Navierâ–“Stokes equations are integrated to determine the flow field structure for large values of the time using an accurate spectral-finite difference method, but with the boundary vorticity calculated using global vorticity conditions rather than local finite-difference approximations. The lock-on phenomenon has been predicted and its effect on the flow hydrodynamics has been determined. The numerical scheme is verified by applying it to the special case of a steadily rotating cylinder (no forced oscillations) and good qualitative agreements are found.
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