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

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

Research output: Contribution to journalArticlepeer-review

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 languageEnglish
JournalJournal of Visualization
DOIs
Publication statusAccepted/In press - 2021

Keywords

  • Image-based measurement
  • Oil film
  • Skin friction stress
  • Wall shear stress

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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