Wall-turbulence structure with pressure gradient around 2D hump

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Direct numerical simulation around a two-dimensional hump shape is conducted at the Reynolds number Reh = 16, 000, based on the hump height. We investigate wall-turbulence structures around the hump in order to predict and control them to suppress separation. At this Reynolds number, specific striped wall-turbulence structure appears at the leading-edge near the wall surface. Its spanwise length-scale is close to that of the streak in a fully-developed turbulent channel flow. That is λy = 0.08 scaled with the hump height, which corresponds to λ+ y = 150 in the local viscous unit. We identify two more different spanwise-correlated scales, λy = 0.40 and 0.13 around the hump. Spanwise length-scale of λy = 0.40 is around λ+ y = 600. On the other hand, the other scale λy = 0.13 is not dependent on the local viscous scale.

Original languageEnglish
Title of host publicationProgress in Turbulence VI - Proceedings of the iTi Conference on Turbulence 2014
EditorsAlessandro Talamelli, Joachim Peinke, Gerrit Kampers, Martin Oberlack, Marta Wacławczyk
PublisherSpringer Science and Business Media, LLC
Pages167-171
Number of pages5
ISBN (Print)9783319291291
DOIs
Publication statusPublished - 2016 Jan 1
Externally publishedYes
Event6th International Conference on Progress in Turbulence, iTi 2014 - Warsaw, Poland
Duration: 2014 Aug 292014 Aug 29

Publication series

NameSpringer Proceedings in Physics
Volume165
ISSN (Print)0930-8989
ISSN (Electronic)1867-4941

Other

Other6th International Conference on Progress in Turbulence, iTi 2014
CountryPoland
CityWarsaw
Period14/8/2914/8/29

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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    Yakeno, A., Kawai, S., Nonomura, T., & Fujii, K. (2016). Wall-turbulence structure with pressure gradient around 2D hump. In A. Talamelli, J. Peinke, G. Kampers, M. Oberlack, & M. Wacławczyk (Eds.), Progress in Turbulence VI - Proceedings of the iTi Conference on Turbulence 2014 (pp. 167-171). (Springer Proceedings in Physics; Vol. 165). Springer Science and Business Media, LLC. https://doi.org/10.1007/978-3-319-29130-7_30