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Journal of Visualization

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28-09-2021 | Regular Paper

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

Authors: Kanta Endo, Takumi Ambo, Yuji Saito, Taku Nonomura, Lin Chen, Keisuke Asai

Published in: Journal of Visualization | Issue 2/2022

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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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Title: Proposal and verification of optical flow reformulation based on variational method for skin-friction-stress field estimation from unsteady oil film distribution
Authors: Kanta Endo
Takumi Ambo
Yuji Saito
Taku Nonomura
Lin Chen
Keisuke Asai
Publication date: 28-09-2021
Publisher: Springer Berlin Heidelberg
Published in: Journal of Visualization / Issue 2/2022
Print ISSN: 1343-8875
Electronic ISSN: 1875-8975
DOI: https://doi.org/10.1007/s12650-021-00794-8

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