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Spontaneous generation of a swirling plume in a stratified ambient
Marqués Truyol, Francisco; López Moscat, Juan Manuel
Universitat Politècnica de Catalunya. Departament de Física Aplicada; Universitat Politècnica de Catalunya. DF - Dinàmica No Lineal de Fluids
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.
Àrees temàtiques de la UPC::Física
Taylor vortices
Heat--Convection, Natural
Broken symmetry (Physics)
Dust devils
Inclosures
nonlinear instability
plumes/thermals
stratified flows
Number termal-convection
Taylor-Couette flow
Natural-convection
Nonlinear dynamics
Gluing bifurcation
Columnar vortices
Symmetry-breaking
Dust devils
Instability
Enclosures
Calor -- Convecció
Simetria trencada (Física)
Attribution-NonCommercial-NoDerivs 3.0 Spain
http://creativecommons.org/licenses/by-nc-nd/3.0/es/
info:eu-repo/semantics/publishedVersion
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