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The present work is aimed to study unsteady forced convection of two heated horizontal cylinders confined in a 2-D square enclosure. The widths of the inlet and outlet ports are equal to 10% of the enclosure height. The cylinders are located at the middle of the enclosure height and the walls of the cavity are adiabatic. The simulations are carried out for Reynolds numbers between 380 and 550 and dimensionless horizontal distances of cylinders at 0.1, 0.2 and 0.3, respectively. The results indicate that the variation of the area-averaged Nusselt number strongly depends on the Reynolds number. On the contrary, the effect of cylinders' spacing on heat transfer was found to be nearly negligible for Re<460. It is also observed that steady state flow and heat transfer shift to periodical oscillation, and ultimately chaotic oscillation in non-dimensional cylinders distance of 0.1; however the sequence of appearing this route is completely different for higher cylinder spacing.

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In this paper, the numerical study is performed to investigate the natural convection characteristics in a 2D water tank model. The hot water flows in horizontal cylinder, heating the water stored in a water tank. The effects of different aspect ratios are numerically analyzed to inspect the natural convection characteristics in the 2D water tank model. The average and local Nusselt number over the cylinder surface at different aspect ratios and cylinder surface temperature are also discussed.

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