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|Title:||Numerical study of the transition of a buoyant plume from a three-dimensional open cavity heated from below|
|Citation:||Proceedings of the 21st Australasian Fluid Mechanics Conference (AFMC 2018), 2018 / pp.1-4|
|Publisher:||Australian Fluid Mechanics Society|
|Conference Name:||21st Australasian Fluid Mechanics Conference (10 Dec 2018 - 13 Dec 2018 : Adelaide, Australia)|
|M. Qiao, Z. Tian and F. Xu|
|Abstract:||The transition of a buoyant plume from an open cavity heated from below is studied by using numerical simulation. A small range of Rayleigh numbers from 10⁴ to 10⁵ and aspect ratio of A = 1/2, and Prandtl number of Pr = 0.7 (air) is considered. The plume from an open cavity heated below approaches a periodic puffing state around the Rayleigh number 8.6×10⁴, it suggests that the plume from the open cavity heated below undergoes a supercritical Hopf bifurcation from a steady flow to a periodic flow. The following results reveal that there exists a series of period-doubling bifurcations after the Rayleigh number exceeds 8.6×10⁴. Moreover, the phase pictures are displayed to understand the period-doubling bifurcations further. The understanding of the transition of buoyant plumes from a three-dimensional open cavity is of practical importance for the design of various systems such as smoke exhausts.|
|Rights:||Commencing with 19AFMC, the Society holds copyright to papers which appear in the Proceedings. Prior to that, copyright resides with authors of the papers.|
|Appears in Collections:||Mechanical Engineering conference papers|
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