Coherent structures over riblets in turbulent boundary layer studied by combining time-resolved particle image velocimetry (TRPIV), proper orthogonal decomposition (POD), and finite-time Lyapunov exponent (FTLE)

• Main Authors: Li, Shan, Jiang, Nan, Yang, Shaoqiong, Huang, Yongxiang, Wu, Yanhua
• Other Authors: School of Mechanical and Aerospace Engineering
• Format: Article
• Language: English
• Published: 2020
• Subjects: Engineering::Aeronautical engineering; Finite-time Lyapunov Exponent; Proper Orthogonal Decomposition
• Online Access: https://hdl.handle.net/10356/144150
• Institution: Nanyang Technological University

Time-resolved particle image velocimetry (TRPIV) experiments are performed to investigate the coherent structure's performance of riblets in a turbulent boundary layer (TBL) at a friction Reynolds number of 185. To visualize the energetic large-scale coherent structures (CSs) over a smooth surf...