000014581 001__ 14581
000014581 005__ 20161115100156.0
000014581 04107 $$aeng
000014581 046__ $$k2016-08-21
000014581 100__ $$aHuerre, Patrick
000014581 24500 $$aLocal and global instability of buoyant jets and plumes

000014581 24630 $$n24.$$p24th International Congress of Theoretical and Applied Mechanics - Book of Papers
000014581 260__ $$bInternational Union of Theoretical and Applied Mechanics, 2016
000014581 506__ $$arestricted
000014581 520__ $$2eng$$aThe local and global linear stability of buoyant jets and plumes has been studied as a function of the Richardson number Ri and density ratio S in the low Mach number approximation. Only the m = 0 axisymmetric mode is shown to become globally unstable, provided that the local absolute instability is strong enough. The helical mode of azimuthal wavenumber m = 1 is always globally stable. A sensitivity analysis indicates that in buoyant jets (low Ri), shear is the dominant contributor to the growth rate, while, for plumes (large Ri), it is the buoyancy. A theoretical prediction of the Strouhal number of the self-sustained oscillations in helium jets is obtained that is in good agreement with experimental observations over seven decades of Richardson numbers.

000014581 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000014581 653__ $$a

000014581 7112_ $$a24th International Congress of Theoretical and Applied Mechanics$$cMontreal (CA)$$d2016-08-21 / 2016-08-26$$gICTAM2016
000014581 720__ $$aHuerre, Patrick
000014581 8560_ $$ffischerc@itam.cas.cz
000014581 8564_ $$s188990$$uhttps://invenio.itam.cas.cz/record/14581/files/TS.FM07-4.06.pdf$$yOriginal version of the author's contribution as presented on CD,  page 957, code TS.FM07-4.06
.
000014581 962__ $$r13812
000014581 980__ $$aPAPER