000014571 001__ 14571
000014571 005__ 20161115100155.0
000014571 04107 $$aeng
000014571 046__ $$k2016-08-21
000014571 100__ $$aWesfreid, José
000014571 24500 $$aInstabilities in the flow behind rotating bluff bodies

000014571 24630 $$n24.$$p24th International Congress of Theoretical and Applied Mechanics - Book of Papers
000014571 260__ $$bInternational Union of Theoretical and Applied Mechanics, 2016
000014571 506__ $$arestricted
000014571 520__ $$2eng$$aThe wake and its instabilities behind rotating sphere and a simplified model of propeller were investigated for moderate Reynolds numbers, in a low- velocity water channel. We observed different vortex structures with LIF method and the velocity field was measured with PIV. The influence of rotation speed on vortex shape and size was analysed. The explored range of Reynolds number was from 0 to 400 and the swirl or rotation parameter Q was not higher than 4 for the sphere and 2 for the rotor. For non-rotating bodies, is very well know the existence of various flow regimes with axisymmetric base flow, pairs of stationary counter-rotating vortices, and unsteady vortex shedding with hairpins. We described the occurrence of new regimes in presence of rotation with lower and higher helical modes. In this talk new results about the non- linear evolution of the instability modes are presented.

000014571 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000014571 653__ $$a

000014571 7112_ $$a24th International Congress of Theoretical and Applied Mechanics$$cMontreal (CA)$$d2016-08-21 / 2016-08-26$$gICTAM2016
000014571 720__ $$aWesfreid, José
000014571 8560_ $$ffischerc@itam.cas.cz
000014571 8564_ $$s205899$$uhttps://invenio.itam.cas.cz/record/14571/files/TS.FM07-3.02.pdf$$yOriginal version of the author's contribution as presented on CD,  page 937, code TS.FM07-3.02
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000014571 962__ $$r13812
000014571 980__ $$aPAPER