Wall shear-stress extraction by an optical flow algorithm with a sub-grid formulation

作     者：The Hung Tran Lin Chen The Hung Tran;Lin Chen

作者机构：Faculty of Aerospace EngineeringLe Quy Don Technical UniversityHanoi10000Vietnam Institute of Engineering ThermophysicsChinese Academy of SciencesBeijing100190China School of Aeronautics and AstronauticsUniversity of Chinese Academy of SciencesBeijing100049China 

出 版 物：《Acta Mechanica Sinica》 (力学学报（英文版）)

年 卷 期：2021年第37卷第1期

页      面：65-79,I0003页

核心收录：

学科分类：080704[工学-流体机械及工程] 080103[工学-流体力学] 08[工学] 0807[工学-动力工程及工程热物理] 0802[工学-机械工程] 0701[理学-数学] 0801[工学-力学（可授工学、理学学位）] 0702[理学-物理学] 

基　　金：Department of Aerospace Engineering, Tohoku University Department of Mechanical and Aerospace Engineering, Western Michigan University Trường Đại học Duy Tân, DTU 

主　　题：Wall shear-stress Optical flow Thin-oil-film equation Sub-grid model 

摘      要：In this study,we developed a novel optical-flow algorithm for determining the wall shear-stress on the surface of *** algorithm solves the thin-oil-film equation using a numerical scheme that recovers local features neglected by smoothing filters.A variational formulation with a smoothness constraint was applied to extract the global shear-stress *** algorithm was then applied to scalar images generated using direct numerical simulation(DNS)method,which revealed that the errors were smaller than those of conventional *** application of the proposed algorithm to recover the wall shear-stress on a low-aspect-ratio wing and on an axisymmetric boattail model taken as examples in this study showed a strong potential for analysing shear-stress *** to the methods used in previous studies,proposed method reveals more local features of separation line and singular points on object surface.