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- W2170770596 abstract "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." @default.
- W2170770596 created "2016-06-24" @default.
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- W2170770596 date "2014-11-26" @default.
- W2170770596 modified "2023-10-02" @default.
- W2170770596 title "Spontaneous generation of a swirling plume in a stratified ambient" @default.
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- W2170770596 doi "https://doi.org/10.1017/jfm.2014.628" @default.
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