Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/144150
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dc.contributor.authorLi, Shanen_US
dc.contributor.authorJiang, Nanen_US
dc.contributor.authorYang, Shaoqiongen_US
dc.contributor.authorHuang, Yongxiangen_US
dc.contributor.authorWu, Yanhuaen_US
dc.date.accessioned2020-10-16T02:16:09Z-
dc.date.available2020-10-16T02:16:09Z-
dc.date.issued2018-
dc.identifier.citationLi, S., Jiang, N., Yang, S., Huang, Y, & Wu Y. (2018). 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)*. Chinese Physics B, 27(10), 104701-. doi:10.1088/1674-1056/27/10/104701en_US
dc.identifier.issn1674-1056en_US
dc.identifier.urihttps://hdl.handle.net/10356/144150-
dc.description.abstractTime-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 surface and riblets, the proper orthogonal decomposition (POD) and finite-time Lyapunov exponent (FTLE) are used to identify the CSs in the TBL. Spatial-temporal correlation is implemented to obtain the characters and transport properties of typical CSs in the FTLE fields. The results demonstrate that the generic flow structures, such as hairpin-like vortices, are also observed in the boundary layer flow over the riblets, consistent with its smooth counterpart. Low-order POD modes are more sensitive to the riblets in comparison with the high-order ones, and the wall-normal movement of the most energy-containing structures are suppressed over riblets. The spatial correlation analysis of the FTLE fields indicates that the evolution process of the hairpin vortex over riblets are inhibited. An apparent decrease of the convection velocity over riblets is noted, which is believed to reduce the ejection/sweep motions associated with high shear stress from the viscous sublayer. These reductions exhibit inhibition of momentum transfer among the structures near the wall in the TBL flows.en_US
dc.language.isoenen_US
dc.relation.ispartofChinese Physics Ben_US
dc.rights© 2018 Chinese Physical Society and IOP Publishing Ltd. All rights reserved.en_US
dc.subjectEngineering::Aeronautical engineeringen_US
dc.titleCoherent 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)en_US
dc.typeJournal Articleen
dc.contributor.schoolSchool of Mechanical and Aerospace Engineeringen_US
dc.identifier.doi10.1088/1674-1056/27/10/104701-
dc.identifier.issue10en_US
dc.identifier.volume27en_US
dc.identifier.spage104701en_US
dc.subject.keywordsFinite-time Lyapunov Exponenten_US
dc.subject.keywordsProper Orthogonal Decompositionen_US
dc.description.acknowledgementProject supported by the National Natural Science Foundation of China (Grant Nos. 11332006, 11732010, 11572221, and 11502066) and the Natural Science Foundation of Tianjin City (Grant No. 18JCQNJC5100).en_US
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