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Micro-cavity arrays have been identified as a potential passive device to disrupt and capture sweep events, which are responsible for the Reynolds stresses in the boundary layer. The application of micro-cavity arrays for drag reduction was proposed 10 years ago by the University of Adelaide [1-8] and the present article summarises the findings of its investigation during this time. These results are based on data obtained through comprehensive experimental investigations, which has shown that the application of microcavity arrays can achieve a reduction of up to 16% in turbulence energy production within the wall-bounded turbulent flow at low Reynolds numbers [7]. This reduction of turbulent production can be correlated to a skin friction drag reduction of approximately 3% [9]. In a more recent work, a direct numerical modelling investigation into the shared common backing cavity arrangement has been conducted [8]. The results revealed that a maximum reduction in the wall shear stresses of 7.12% could be achieved, which lasted for a considerable distance downstream of the cavity array.

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