This study investigates the triggering of vortex shedding by transverse and in-line forced oscillation of a circular cylinder placed in a uniform stream below the critical Reynolds number 47. The effect of Reynolds number, frequency and amplitude of cylinder oscillation is investigated numerically. The effect of Reynolds number, amplitude of oscillation, and frequency of oscillation is investigated. Time-mean and rms values of lift, drag, base pressure, and torque coefficients, as well as mechanical energy transfer, are plotted against Reynolds number and amplitude of oscillation. Periodic vortex shedding is more easily triggered for a cylinder oscillated transversely than for in-line oscillation. Lower Reynolds number, amplitude of oscillation, and time is needed to reach periodic vortex shedding for the transversely oscillated cylinder.

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