000014747 001__ 14747
000014747 005__ 20161115100201.0
000014747 04107 $$aeng
000014747 046__ $$k2016-08-21
000014747 100__ $$aCaulfield, Colm-Cille
000014747 24500 $$aTurbulent layer dynamics in stratified Taylor-Couette flow

000014747 24630 $$n24.$$p24th International Congress of Theoretical and Applied Mechanics - Book of Papers
000014747 260__ $$bInternational Union of Theoretical and Applied Mechanics, 2016
000014747 506__ $$arestricted
000014747 520__ $$2eng$$aWe describe a series of laboratory experiments to study the turbulent mixing dynamics of an initially linear stratification in Taylor-Couette flow, i.e. the flow in the annular region between two concentric cylinders. As described in [1], relatively well-mixed layers separated by substantially thinner ‘interfaces’ of enhanced density gradient spontaneously form. Consistently with [1], these layers are extremely long-lived, and exhibit an average turbulent buoyancy flux that falls on a ‘universal’ curve independent of the number of the layers. However, by high-frequency measurements of density and image analysis, we show that the ‘interfaces’ are highly spatially and temporally intermittent, and for sufficiently small separation between interfaces, there is a dynamically robust, and profoundly nonlinear coupling between neighbouring interfaces. Such robust spatio-temporal intermittency has significant implications for the quantification and parameterisation of mixing driven by horizontal shear, as commonly arises in the environment.

000014747 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000014747 653__ $$a

000014747 7112_ $$a24th International Congress of Theoretical and Applied Mechanics$$cMontreal (CA)$$d2016-08-21 / 2016-08-26$$gICTAM2016
000014747 720__ $$aCaulfield, Colm-Cille
000014747 8560_ $$ffischerc@itam.cas.cz
000014747 8564_ $$s133706$$uhttps://invenio.itam.cas.cz/record/14747/files/TS.FM14-5.04.pdf$$yOriginal version of the author's contribution as presented on CD,  page 1447, code TS.FM14-5.04
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000014747 962__ $$r13812
000014747 980__ $$aPAPER