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The present article reports numerical results of laminar natural convection heat transfer within an air filled semi cylindrical cavity with its horizontal walls submitted to different heating models. In this work, the horizontal surface is maintained at constant temperatures Tc (Dirichlet condition) or heat fluxes q (Newman condition), while that of the opposite surface is considered at cold temperature Tf. The parameters governing the problem are the Rayleigh number (103 < Ra < 106), and the Prandtl number (Pr = ...