  The present study investigates unsteady wake dynamics in flow past
oscillating cylinder. Two-dimensional computational study is carried out for
flow past sinusoidally oscillating cylinder. Operating parameters like Reynolds
number, forcing frequency, amplitude and wavelength are systematically varied
and their effect on wake dynamics is investigated. Lift and drag coefficients
are plotted with cylinder position to characterize the flow. Further, flow
field is investigated using Proper Orthogonal Decomposition (POD).
Time-resolved vorticity contours are obtained. These results are then processed
using POD algorithm. POD mode shapes and Power Spectral Density (PSD) plots are
obtained for each case. Wake dynamics is analyzed using POD results. Flow
response to cylinder oscillations is characterized by the POD mode shape and
dominant frequency peaks in PSD plots. It is observed that flow is too
dissipative at lower values of Reynolds number. Further, effect of frequency
ratio is observed in achieving synchronized vortex shedding. High amplitude and
large wavelength regime, which remained unexplored in previous research is also
investigated.
