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Proposal and verification of optical flow reformulation based on variational method for skin-friction-stress field estimation from unsteady oil film distribution

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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.

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Acknowledgements

This work was partially supported by JSPS KAKENHI Grant Number 20H00278 and 19KK0361, and JST FOREST Grant Number JPMJFR202C.

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Authors and Affiliations

  1. Department of Aerospace Engineering, Tohoku University, 6-6-1 Aramaki, Aoba-ku, Sendai, Japan

    Kanta Endo, Takumi Ambo, Yuji Saito, Taku Nonomura & Keisuke Asai

  2. Institute of Engineering Thermophysics, Chinese Academy of Sciences, No.11 Beisihuanxi Road, Haidian District, Beijing, 100190, China

    Lin Chen

  3. University of Chinese Academy of Sciences, No. 19(A), Yuquan Road, Shijingshan District, Beijing, 100049, China

    Lin Chen

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  1. Kanta Endo
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  2. Takumi Ambo
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  3. Yuji Saito
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  4. Taku Nonomura
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  5. Lin Chen
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  6. Keisuke Asai
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Correspondence to Kanta Endo.

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Endo, K., Ambo, T., Saito, Y. et al. Proposal and verification of optical flow reformulation based on variational method for skin-friction-stress field estimation from unsteady oil film distribution. J Vis 25, 263–280 (2022). https://doi.org/10.1007/s12650-021-00794-8

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