Comparative study of flow characteristics of a single offset jet and a turbulent dual jet

The present paper consists of a numerical investigation of dynamic and thermal characteristics of the flow field resulting from the interaction of dual-jet consisting of a wall jet and an offset jet and comparison with a single turbulent offset jet. The effects of velocity and offset ratios between two jets in the near field region have been simulated numerically using two-dimensional steady RANS equations. The simulation is carried out through the resolution of the different governing Navier-Stokes' equations by means of the finite volume method. Two different closure models were tested: the standard k-e model and the Reynolds stress model (RSM) second order model. A non-uniform mesh system tightened close to the emitting nozzle and both the vertical and horizontal walls is also adopted. The confrontation of the numerical results with experimental data from literature shows satisfying agreement with the RSM model in the description of the handled flow; that's why we adopted it for the rest of the paper. Once the model validated, a detailed discussion has been provided on the mean velocities, pressure field, Reynolds stress, and kinetic energy. The merge point, the combined point and the impact point have also been obtained and compared with other results. A similarity profile has been obtained in the downstream direction for different offset and velocity ratios.