Effect of Obstacle Position and Porous Medium for Heat Transfer in an Obstructed Ventilated Cavit

In this paper, heat transfer enhancement in an obstructed ventilated cavity using porous medium was investigated. the lattice boltzmann method was used to simulate forced convection in clear and porous domain. the brinkman forchheimer model was performed to simulate porous medium. the walls of cavity in addition to inlet and outlet port are thermally insulated and the obstacle is maintained at constant temperature. the simulation was carried out for different reynolds and prandtl numbers in the range of 20 to 60 and 0.7 to 5, respectively. furthermore the effects of different positions of obstacle and different porosity values on thermal field, flow field and nusselt number were studied. the results show that by adding the porous medium to the domain and decreasing porosity, heat transfer enhances. also by augmentation of reynolds and prandtl numbers the value of average nusselt number increases. furthermore the result points that the obstacle position has important effect on heat transfer rate. the best position of obstacle to reach the maximum heat transfer rate is position 1.