Natural convection in an enclosure is relevant to many industrial and environmental applications such as heat exchangers, nuclear and chemical reactors, cooling of electronic equipment, and stratified atmospheric boundary layers. The present work reports a two-dimensional numerical simulation for natural convection in an enclosure with a bottom wall at constant high temperature, a top wall at constant low temperature and a hot cylinder inside, using a tool of computational fluid dynamics (CFD), ANSYS CFX 15.0. The objective of the work is to study the influence of the body geometry, body position in the enclosure, fluid properties and mainly the temperature difference between the walls, in terms of Prandtl and Rayleigh numbers. Steady-and transient laminar flow was identified for Prandtl number of 0.7 and 7.0, with Rayleigh number up to 10~7.
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