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- W4379876475 abstract "A new method was developed to extract surface flow vectors from an oilflow visualization image that has oil streaklines. The method is analogous to the PIV processing where the image is divided into interrogation windows. A representative flow direction is obtained for each interrogation window using image processing with a line-detection algorithm. Repeating the process for the entire image, one can find the surface vector field. The Hough transformation, Radon transformation and Machine Learning were used as line-detection algorithms. The obtained vector field is then postprocessed to filter spurious vectors and to apply smoothing. The method was tested on 2D and 3D models with different flow complexities. The method was able to predict surface flow vectors for all cases tested. The predicted surface flow vectors were used in obtaining the surface skin friction. The successful implementation of the surface flow vectors enables interferometric skin friction measurements on surfaces beneath 3D complex flows. In addition, the surface flow vectors can be superimposed on the oilflow visualization images to better explain the surface flow topology." @default.
- W4379876475 created "2023-06-09" @default.
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- W4379876475 date "2023-06-08" @default.
- W4379876475 modified "2023-09-23" @default.
- W4379876475 title "A Method for Obtaining Surface Flow Vectors and Its Implementation in Interferometric Skin Friction Measurement" @default.
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- W4379876475 doi "https://doi.org/10.2514/6.2023-4358" @default.
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