Abstract
Abstract A novel thermal immersed boundary-lattice Boltzmann method is developed to simulate the 2D natural convection in a concentric horizontal annulus with a constant flux wall. In the present work, we focus on the multiple steady solutions of this problem. And the case with a fixed aspect ratio Ar = 2 is considered. In addition to the dual steady solutions which was reported by the previous work (Yoo, 2003), a new steady solution consisting more of eddies is found in this paper when the Rayleigh number exceeds a certain critical value.
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