Three-dimensional global stability on stuart vortex of free shear layer

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Three-dimensional secondary global instability for the two-dimensional Stuart vortex of a free shear layer is investigated. That is in order to clarify an increase mechanism of the turbulence kinetic energy which is due to three-dimensional rib structure between rolls when the flow separation is achieved. We developed a program to compute the optimal transitional modes to amplify kinetic energy the most for the two-dimensional Stuart vortex base flow and compared the three-dimensional optimal growths for several Stuart vortex profiles, they correspond to which pulsation generates in downstream of a hump in DNS study. Results show that linear energy growth rate of turbulence component becomes large at the high-frequency case and small at the low-frequency case, that tendency does not correspond to which in DNS study. It implies that not only the linear growth but also nonlinear process should contribute to generate three-dimensional rib structure and increase turbulence energy.

Original languageEnglish
Title of host publicationProgress in Turbulence VIII - Proceedings of the iTi Conference in Turbulence 2018
EditorsRamis Örlü, Alessandro Talamelli, Joachim Peinke, Martin Oberlack
PublisherSpringer Science and Business Media, LLC
Number of pages5
ISBN (Print)9783030221959
Publication statusPublished - 2019
Event8th iTi Conference on Turbulence, 2018 - Bertinoro, Italy
Duration: 2018 Sept 32018 Sept 7

Publication series

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


Conference8th iTi Conference on Turbulence, 2018


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