Drag reduction performance of a hemispherical body with equal area porous opposing jets was numerically studied using the two-equation shear stress transfer (SST) k -ω turbulence model. Based on the presupposition of equal total jet area

the porous opposing jets were applied around the stationary point of the hemispherical body. By changing the total pressure ratio and number of the jets

the effects of each parameter on the drag reduction were analyzed and the interactions of the porous opposing jets were also discussed. The numerical results showed that opposing jet could reduce the drag of the hemispherical body effectively. With the increase of the total pressure ratio of the jets

the recirculation zone was enlarged and thus the drag reduction performance was improved. Moreover

the drag reduction performance was first improved and then dropped as the number of jets increased. In this study

two opposing jets obtained the best drag reduction performance with the highest percentage of the drag coefficient reduction as 29% due to the interaction of two opposing jets. The porous opposing jets demonstrated the possibility of achieving good drag reduction performance.