Abstract
This study investigated the effect of variation in the angle of the elliptic cylinder as well as the presence of circular cylinder on natural convection inside a square enclosure. The Rayleigh number was varied between 10SUP3/SUP and 10SUP6/SUP, and the Prandtl number was fixed to 0.7. In the present study, the angle of the elliptic cylinder was changed from 0° to 90°, and the perimeter of the elliptic cylinder was same as that of the circular cylinder. The immersed boundary method was used to capture the virtual wall boundary of the inner cylinder. With the increasing angle of the elliptic cylinder, the surface-averaged Nusselt numbers on the cylinder and the enclosure increased. In the Rayleigh number range considered in the present study, the surface-averaged Nusselt number on the elliptic cylinder over = 45° was higher than that of the circular cylinder. The effect of elliptic cylinder’s angle on natural convection in the enclosure was analyzed according to the flow and thermal fields, and the distributions of the Nusselt number.
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