In the present paper, a numerical analysis is performed to study the heat transfer and entropy generation characteristics past a blunt-headed cylinder which has industrial significance and is widely used in electronic components, turbomachinery, and aeronautics. Simulations are carried out employing air (Pr = 0.71) as an operating fluid at a Reynolds numbers range 40-160. The curvature ratio is defined as the ratio of the radius of curvature (r) and diameter of the semicircular portion of the cylinder (d) of the trailing edge and is varied from 0 to 0.5. Heat transfer characteristics are studied by computing local and time averaged values of Nusselt numbers. Effects of corner modification on local Nusselt number spikes at corners have been observed. An entropy generation analysis has been carried out to elucidate the impact of corner modification on temperature and velocity gradients around the blunt headed cylinder. An optimum value of the curvature ratio is found out at which entropy generation is minimum.