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The lattice Boltzmann method is used to simulate the natural convection in a cylindrical enclosure with an internal concentric slotted hollow. The Rayleigh number varied from 104 to 106 and the slotted ratio ranged from 0.1 to 0.5. Isotherms are used to observe the flow and heat transfer characteristics. Time variation of dimensionless temperature at a certain point is inspected and the u-v phase diagrams are mapped showing different flow patterns that include steady flow, periodic oscillatory flow, and quasi-periodic oscillatory flow. By comparing with experimental and numerical results in the existing literature, it is concluded that the oscillation phenomenon in this model is mainly caused by its own intrinsic features. [ABSTRACT FROM AUTHOR]