Abstract
A numerical investigation is carried out to understand the effect of side ratio, as well as aiding/opposing buoyancy on the aerodynamic and heat transfer characteristics around a rectangular cylinder in the vertical unconfined configuration. The representative vortex structures and isotherms patterns are presented and discussed. A correlation between the critical Richardson number for the buoyancy-induced breakdown of Kármán vortex street and the side ratio of the cylinder is obtained. The influence of side ratio and buoyancy on Strouhal number, drag and lift coefficient, the recirculation length, and heat transfer from the cylinder is also investigated.
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