Numerical study of flow around an inclined elliptic cylinder oscillating in line with an incident uniform flow

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Numerical calculations of the flow around an inclined elliptic cylinder oscillating in-line with the incident steady flow are reported at Reynolds number R=10 3 and a fixed major–minor axis ratio of 0.5. The flow is incompressible and two-dimensional, and the in-line oscillations are harmonic. These oscillations are superimposed on the constant translational velocity as a single-frequency perturbation to examine the effect of increase of the perturbation amplitude and angle of inclination on the near-wake structure and the hydrodynamic forces acting on the cylinder. The numerical results lead to the postulation of two regimes for vortex shedding depending on the angle of inclination, which are discussed in some detail for exemplary cases.