Abstract
Abstract: In this study, the optical flow method for the skin-friction-stress estimation from the unsteady oil film distribution was reformulated based on the variational method, and the validity of the proposed method was verified in comparison with the conventional method. The regularization is proposed to be added directly to the skin-friction-stress field in the proposed method while the regularization is added to the amount of oil movement in the conventional method. As a result, the smoothness of the skin-friction-stress field can be controlled by adjusting the regularization parameter in the proposed method whereas it was difficult in the conventional method. The performance of the proposed method was evaluated to be superior to the previous method through the numerical and experimental data. Graphic Abstract: [Figure not available: see fulltext.]
Original language | English |
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Pages (from-to) | 263-280 |
Number of pages | 18 |
Journal | Journal of Visualization |
Volume | 25 |
Issue number | 2 |
DOIs | |
Publication status | Published - 2022 Apr |
Keywords
- Image-based measurement
- Oil film
- Skin friction stress
- Wall shear stress
ASJC Scopus subject areas
- Condensed Matter Physics
- Electrical and Electronic Engineering