High-Resolution Skin-Friction Measurement Technique Based onOptical Flow Algorithm

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As a tool for visualizing two-dimensional skin-friction distribution on model surfaces, a new technique named “Global Luminescent Oil-Flow (GLOF)" technique has been developed. This method uses “optical flow" technique and extracts skin-friction vector field from time-series of oil-flow images. The accuracy and resolution of this technique were evaluated by applying to square cylinder and NACA-0012 airfoil testing. We found that GLOF allows us to measure skin friction distribution under the complex flow field including the reverse-flow region of a laminar separation bubble.