| Heat transfer in the stagnation point area of a heated cylinder is investigated using Direct Numerical Simulation (DNS). The heated cylinder is subjected to the turbulent wake of a smaller cylinder placed up-stream. The Reynolds number based on the diameter of the heated cylinder is 48,000. In accordance with correlations in the literature, an increase in heat transfer for all angles along the front circumferencial area of the heated cylinder is found compared to fully laminar flow. However, presumably due to the presence of the wake, the maximum increase is shifted away from the centerline. The characteristic turbulence level and Nusselt number for the present study are an order of magnitude higher than those reported in previous simulations. The obtained DNS data are in good agreement with an existing experimental correlation. Finally, relevant flow structures and instantaneous temperature fields are visualized. |
