Bulletin of the American Physical Society
71st Annual Meeting of the APS Division of Fluid Dynamics
Volume 63, Number 13
Sunday–Tuesday, November 18–20, 2018; Atlanta, Georgia
Session Q34: Stratified Flows and Thermal Instabilities
12:50 PM–3:26 PM,
Tuesday, November 20, 2018
Georgia World Congress Center
Room: B406
Chair: Colm-Cille Caulfield, University of Cambridge
Abstract ID: BAPS.2018.DFD.Q34.11
Abstract: Q34.00011 : Flow instability of natural convection in horizontal annuli under non-Oberbeck-Boussinesq condition*
3:00 PM–3:13 PM
Presenter:
Yuhui Cao
(University of Chinese Academy of Sciences)
Author:
Yuhui Cao
(University of Chinese Academy of Sciences)
The hydrodynamic and thermal instabilities in the natural convection in horizontal concentric annuli have been studied extensively under the Oberbeck-Boussinesq (constant-property) assumption. However, the effects of the variable properties on the instabilities of these systems have not been fully understood. In this work, numerical simulations and theoretical analysis are performed to investigate the flow instability under non-Oberbeck-Boussineq conditions for a wide range of the temperature difference ratios and radius ratios. A variable-property-based lattice Boltzmann flux solver is used to account for the total variation in fluid properties. The results demonstrate that the variable property effect and the initial condition effect play important roles in determining the flow pattern, and that the significance of both effects depends strongly and non-monotonically on the temperature difference ratio.
*This work is supported by the National Key R&D Program of China [grant number 2016YFD0400100] and the National Natural Science Foundation of China [grant numbers 51376006, 11452002].
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2018.DFD.Q34.11
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