Abstract From a unified perspective, this review describes global skin friction diagnostics based on surface flow visualizations. The foundations of the developed image-based methods are relations between skin friction and other measurable surface quantities (e.g. oil-film thickness, temperature, scalar density and pressure), which are derived from the relevant governing equations in fluid mechanics. Interestingly, these relations can be re-cast into a generic form of the optical flow equation in the image plane, and therefore skin friction fields can be extracted from surface visualization images by using a variational method as an optical flow problem. Global skin friction diagnostics in typical experiments are described, including experimental setups, image processing, and topological interpretation of extracted skin friction fields.
Global skin friction measurements and interpretation
2019-10-16
Article (Journal)
Electronic Resource
English
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