Abstract
Steady-state RANS simulations were performed to establish disturbing action of a cubical obstacle on the turbulent free convection boundary layer in air along a vertical isothermally heated plate. In the case considered, the size of the cube mounted on the plate is about one-third the full thickness of the incoming boundary layer. Using the k-ω SST turbulence model, refined-grid numerical solutions have been obtained assuming the obstacle surfaces either adiabatic or isothermal. Characteristic three-dimensional features of the free convection flow past the cubical obstacle, such as the horseshoe-like vortex structures and the near-wake recirculation, are analyzed in comparison with the previously studied case dealing with the disturbing action of a circular cylinder of unit aspect ratio. Data on heat transfer augmentation near the obstacle are presented and discussed.
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