Simulations of mixing for a confined co-flowing planar jet

Simulations are performed for the evolution of a mixing layer in a channel with two splitter plates at the inlet. The effect of three different velocity ratios are studied for a channel flow configuration. Solutions are obtained from the time-dependent incompressible Navier–Stokes equations by means of an artificial compressibility formulation with dual-time stepping. The transport of a conserved passive scalar is examined to assess the mechanisms of entrainment and mixing within the shear flow. Scalar probability density functions are evaluated to trace the evolution of the mixing layer along the streamwise direction. It is seen that better mixing is obtained at higher velocity ratios.