Abstract
A near-wall PIV technique is introduced to analyze skin friction patterns around a wall-mounted cube. The closest 2-D PIV measurements were performed within 0.5 mm of plane surfaces (with a 1 mm thick laser sheet). A comparison with oil-flow visualizations clearly shows the influence of the measurement height. The differences between both techniques are analyzed and classified into two categories: positioning discrepancies (discrepancies between PIV and oil-flow critical points’ positions), and structural differences (i.e., topological differences). Both types are analyzed. The advantages of this technique in the perspective of a 3-D separated flow topology analysis is twofold. Firstly, it requires standard 2-D PIV equipment, acceptable calibration and setup time. Secondly, it provides reliable qualitative and quantitative near-wall data in areas where oil-flow visualizations are inefficient and with a spatial resolution that would otherwise require many sensors.
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