Kaveenraj, H and Venkatasubbaiah, K
(2019)
Hybrid RANS/LES of Turbulent forced convection
flow over tandem square cylinders.
Masters thesis, Indian institute of technology Hyderabad.
Abstract
Heat transfer in a turbulent forced convection flow over a tandem square cylinder has been numerically studied at moderate Reynolds numbers. The effects of complex wake interactions behind the cylinder on heat transfer is studied. Turbulence is modelled by Detached Eddy Simulation (DES) with kOmegaSSTDES and SpalartAllmarasDES model available in OpenFOAM solver. The forced convection flow is formulated by two dimensional unsteady incompressible flow by neglecting buoyancy terms. The flow domain dimensions have been chosen such that the blockage ratio is less than 5%. The governing equations are solved numerically by Finite Volume method. Results are reported for different Reynolds numbers by varying spacings between the 2 cylinders from 2D to 5D, varying configuration and varying sizes of cylinders. The velocity and vorticity profiles and average Nusselt number values for both the cylinders are presented. The wake region behind the cylinders varies significantly with spacing between the cylinders affecting the heat transfer characteristics of downstream cylinder. The effect of Reynolds number in heat transfer characteristics is less pronounced in the second cylinder as compared to the first cylinder. The present results are matching well with the available experimental correlations and results available in the literature.
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