Qiao, M.Tian, Z.Xu, F.2020-05-152020-05-152018Proceedings of the 21st Australasian Fluid Mechanics Conference (AFMC 2018), 2018, pp.1-49780646597843http://hdl.handle.net/2440/124733The 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.enCommencing with 19AFMC, the Society holds copyright to papers which appear in the Proceedings. Prior to that, copyright resides with authors of the papers.Conference paper10000090422-s2.0-850840963722-s2.0-85075207079510099Tian, Z. [0000-0001-9847-6004]