Numerical study of non-impulsively started flow around a circular cylinder
Fredrickson, Kent Allen
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The effect of constant acceleration, prior to the establishment of a steady uniform flow, on some of the characteristics of the resulting time- dependent flow about a circular cylinder has been investigated numerically. It is shown that the occurrence of a local maximum drag is dependent on the parameters characterizing the non-impulsive nature of the ambient flow. However, the onset of the wake asymmetry and the evolution of the lift and drag forces during the transient period depend on the characteristics of the numerical perturbation used to initiate the asymmetric vortex shedding. It is concluded that the numerical methods can predict, to varying degrees of accuracy, the behavior of the symmetric state and the quasi-steady-state, but not of the intermediate state.
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