Numerical simulation on three-dimensional subsonic impinging jet

Subsonic normal and oblique impinging jet were predicted by three-dimensional compressible Navier-Stokes equations. A finite-volume method with unstructured meshes and RNG k-Ε turbulence model were employed in the calculation. The characteristics of three regions, free flow, stagnation region and wall stress flow in normal impinging flow were simulated. The entrainment near impinging region and reverse flow were shown in the calculating results, which were coincided with those of experiment. From the distribution of velocity, a great velocity gradient can be seen in the zone with 2D distance to the wall. The phenomenon was due to the boundary flow and reverse flow near the wall. The maximum velocity component near the wall and the maximum total pressure shift from the impinging point.