Abstract
The present experimental research has been undertaken in order to explain to what extent the turbulent structure of the flow around a stationary rigid cylinder may be affected by an oscillating approach flow. The general aim was to establish a direct link between the oscillating inflow, local time-resolved quantities like skin friction and surface pressure and near wake behaviour behind the circular cylinder. It has been confirmed that the lock-on synchronization between the periodicity of vortex shedding and free stream oscillations is an important factor affecting the formation mechanisms of the wake. In particular it was found that periodical inflow disturbances bring about a rapid growth of pressure and wall shear stress fluctuations near the separation point. The present results revealed also a tendency toward the shortening of vortex formation length and significant growth of the time and linear microscales of turbulence in lock-on conditions. Additional evidence concerning the role of inflow periodical disturbances in the near wake modification was obtained from analysis of turbulent kinetic energy transport in the flow.
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