000014701 001__ 14701
000014701 005__ 20161115100159.0
000014701 04107 $$aeng
000014701 046__ $$k2016-08-21
000014701 100__ $$aPage, Jacob
000014701 24500 $$aNon-local vorticity generation by surface roughness in viscoelastic shear flows

000014701 24630 $$n24.$$p24th International Congress of Theoretical and Applied Mechanics - Book of Papers
000014701 260__ $$bInternational Union of Theoretical and Applied Mechanics, 2016
000014701 506__ $$arestricted
000014701 520__ $$2eng$$aThe vorticity response to small-amplitude surface undulations in a viscoelastic Couette flow is examined. An integral measure is defined to quantify the depth of vorticity penetration into the bulk flow. Three regimes of penetration are identified, and each occupies a sector of a phase diagram parameterized by the ratios of the channel depth and of the critical-layer (CL) height to the lengthscale of the surface roughness. The CL emerges due to the propagation of vorticity waves along the tensioned mean-flow streamlines. The most intriguing behavior, the trans-critical regime, occurs when the CL lies within one wavelength from the wall. In trans-critical flows a kinematic mechanism associated with the relative realignment of the polymer by the mean shear amplifies the vorticity in ‘sheets’ around the CL. The effect is dominant at this location since the vorticity waves appear steady to an observer advecting with the mean flow.

000014701 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000014701 653__ $$a

000014701 7112_ $$a24th International Congress of Theoretical and Applied Mechanics$$cMontreal (CA)$$d2016-08-21 / 2016-08-26$$gICTAM2016
000014701 720__ $$aPage, Jacob
000014701 8560_ $$ffischerc@itam.cas.cz
000014701 8564_ $$s239437$$uhttps://invenio.itam.cas.cz/record/14701/files/TS.FM12-5.06.pdf$$yOriginal version of the author's contribution as presented on CD,  page 1310, code TS.FM12-5.06
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000014701 962__ $$r13812
000014701 980__ $$aPAPER