000014567 001__ 14567
000014567 005__ 20161115100155.0
000014567 04107 $$aeng
000014567 046__ $$k2016-08-21
000014567 100__ $$aKunii, Kohei
000014567 24500 $$aHelical turbulence and puff in transitional sliding Couette flow

000014567 24630 $$n24.$$p24th International Congress of Theoretical and Applied Mechanics - Book of Papers
000014567 260__ $$bInternational Union of Theoretical and Applied Mechanics, 2016
000014567 506__ $$arestricted
000014567 520__ $$2eng$$aWe performed direct numerical simulations of flows between two concentric cylinders, which flow is driven by a steady sliding motion of the inner cylinder in the axial direction. We parametrically investigated intermittent turbulence in the transitional regime for different radius ratio 77- We found that the reducing Reynolds number (Re) from fully-developed turbulent state gave rise to organized large-scale structures, where localized turbulence and laminar coexisted with some spatial regularities. For 77 = 0.8, a helical pattern of laminar-turbulent structure occurred at Re = 375 and this structure sustained its shape until Re = 337.5. For 17 = 0.5 and 0.1, although the flow became laminar at Re = 375, the laminar patches were observed for 17 = 0.5 at higher Reynolds numbers. The localized turbulence observed for ’7 = 0.1 was intermittent only in the axial direction, which was similar to a turbulent puff in pipe flow.

000014567 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000014567 653__ $$a

000014567 7112_ $$a24th International Congress of Theoretical and Applied Mechanics$$cMontreal (CA)$$d2016-08-21 / 2016-08-26$$gICTAM2016
000014567 720__ $$aKunii, Kohei
000014567 8560_ $$ffischerc@itam.cas.cz
000014567 8564_ $$s196848$$uhttps://invenio.itam.cas.cz/record/14567/files/TS.FM07-2.04.pdf$$yOriginal version of the author's contribution as presented on CD,  page 929, code TS.FM07-2.04
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000014567 962__ $$r13812
000014567 980__ $$aPAPER