Abstract
The unsteady flow past a circular cylinder which starts rotating or rotary oscillating impulsively from rest in a viscous fluid is investigated for Reynolds numbers Re=200 and 1000, rectilinear speed ratios <TEX>${\alpha}$</TEX> between 0.5 and 5.0, and forced oscillating frequencies <TEX>$f_s$</TEX> between 0.1 and 2.0. Numerical solutions of the Navier-Stokes equations are obtained by using a finite volume method on an unstructured colocated grid. The objective of the study is to examine the effect of the rotating and rotary oscillating circular cylinder on the flow patterns and dynamics loads. The numerical results reveal that the <TEX>$K\acute{a}rm\acute{a}n$</TEX> vortex street vanishes entirely behind the rotating cylinder when the ratio <TEX>${\alpha}$</TEX> exceeds the critical value, and the vortex shedding behind the rotary oscillating cylinder undergoes mainly three modes named 'synchronization', 'competition' and 'natural shedding' with the increase of <TEX>$f_s$</TEX>. Based on the amplitude spectra analysis of the lift coefficients, the regions of the classification of flow structure modes are presented, which provide important references for the flow control in the ocean engineering.
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