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This study deals with the numerical simulation of two-dimensional laminar incompressible Newtonian fluid flow past a circular cylinder forced to oscillate inline with the main stream. The effect of frequency ratio FR=f/St on the flow is investigated for Reynolds numbers Re=80, 120, 160 and 200 at a dimensionless oscillation amplitude 0.5. Computations were carried out using a thoroughly tested finite-difference code developed by the authors. Lift, drag and torque coefficients are investigated. When the time-mean values of lift and torque coefficients are plotted against frequency ratio, abrupt changes can be found in the curves, suggesting the presence of switches in the vortex structure. No jumps were observed in the time-mean of drag and rms values of lift, drag and torque coefficients plotted against the frequency ratio. Both rms and time-mean values of force coefficients revealed a shift toward lower frequency ratio with higher Re. Where vortex switches occur, a pre-and post-jump analysis is carried out.

Effect of Frequency Ratio on Flow Around a Cylinder Oscillated In-line At Re=80-200