Interaction of wall boundary layer and vortices in the wake of a rotationally oscillating cylinder.

What is it about?

The wake of a rotationally oscillating cylinder in presence of a plane wall with various gap to diameter ratio is studied experimentally for Re=190 and Re= 250. Effects of wall distance, forcing frequency and oscillation amplitude on the wake structure is studied.

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Why is it important?

This study is particularly important for marine offshore engineering where pipelines and cylindrical structures affect the flow close to the shore. Also, this study can find its application in sub-marine homing as the wake behind the submarine can be altered by imparting rotational oscillation to the submarines.