Wall-turbulence structure with pressure gradient around 2D hump

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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
Number of pages5
ISBN (Print)9783319291291
Publication statusPublished - 2016
Event6th International Conference on Progress in Turbulence, iTi 2014 - Warsaw, Poland
Duration: 2014 Aug 292014 Aug 29

Publication series

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


Conference6th International Conference on Progress in Turbulence, iTi 2014


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