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.


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    Title :

    Global skin friction measurements and interpretation


    Contributors:


    Publication date :

    2019-10-16




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English




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