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Spontaneous generation of a swirling plume in a stratified ambient
dc.contributor.author | Marqués Truyol, Francisco |
dc.contributor.author | López Moscat, Juan Manuel |
dc.contributor.other | Universitat Politècnica de Catalunya. Departament de Física Aplicada |
dc.date.accessioned | 2015-04-22T18:26:43Z |
dc.date.created | 2014-12-01 |
dc.date.issued | 2014-12-01 |
dc.identifier.citation | Marques, F.; Lopez, J.M. Spontaneous generation of a swirling plume in a stratified ambient. "Journal of fluid mechanics", 01 Desembre 2014, vol. 761, p. 443-463. |
dc.identifier.issn | 0022-1120 |
dc.identifier.uri | http://hdl.handle.net/2117/27537 |
dc.description.abstract | The transition from laminar to complex spatio-temporal dynamics of plumes due to a localized buoyancy source is studied numerically. Several experiments have reported that this transition is sensitive to external perturbations. Therefore, a well-controlled set-up has been chosen for our numerical study, consisting of a localized heat source at the bottom of an enclosed cylinder whose sidewall is maintained at a fixed temperature which varies linearly up the wall. Restricting the dynamics to the axisymmetric subspace, the first instability is to a puffing state. However, for smaller Grashof numbers, the plume becomes unstable to three-dimensional perturbations and a swirling plume spontaneously appears. The next bifurcation, viewed in the rotating frame where the plume is stationary, also exhibits puffing and suggests a connection between the unstable axisymmetric puffing solution and the swirling plume. Further bifurcations result in quasi-periodic states with a very low-frequency modulation, and these eventually become spatio-temporally complex. |
dc.format.extent | 21 p. |
dc.language.iso | eng |
dc.rights | Attribution-NonCommercial-NoDerivs 3.0 Spain |
dc.rights.uri | http://creativecommons.org/licenses/by-nc-nd/3.0/es/ |
dc.subject | Àrees temàtiques de la UPC::Física |
dc.subject.lcsh | Taylor vortices |
dc.subject.lcsh | Heat--Convection, Natural |
dc.subject.lcsh | Broken symmetry (Physics) |
dc.subject.lcsh | Dust devils |
dc.subject.lcsh | Inclosures |
dc.subject.other | nonlinear instability |
dc.subject.other | plumes/thermals |
dc.subject.other | stratified flows |
dc.subject.other | Number termal-convection |
dc.subject.other | Taylor-Couette flow |
dc.subject.other | Natural-convection |
dc.subject.other | Nonlinear dynamics |
dc.subject.other | Gluing bifurcation |
dc.subject.other | Columnar vortices |
dc.subject.other | Symmetry-breaking |
dc.subject.other | Dust devils |
dc.subject.other | Instability |
dc.subject.other | Enclosures |
dc.title | Spontaneous generation of a swirling plume in a stratified ambient |
dc.type | Article |
dc.subject.lemac | Calor -- Convecció |
dc.subject.lemac | Simetria trencada (Física) |
dc.contributor.group | Universitat Politècnica de Catalunya. DF - Dinàmica No Lineal de Fluids |
dc.identifier.doi | 10.1017/jfm.2014.628 |
dc.rights.access | Restricted access - publisher's policy |
local.identifier.drac | 15597968 |
dc.description.version | Postprint (published version) |
dc.date.lift | 10000-01-01 |
local.citation.author | Marques, F.; Lopez, J.M. |
local.citation.publicationName | Journal of fluid mechanics |
local.citation.volume | 761 |
local.citation.startingPage | 443 |
local.citation.endingPage | 463 |
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