Abstract
Jet-mixing and residence time in a rectangular water storage tank with a constant water level are investigated using the tools of Computational
Fluid Dynamics (CFD). A set of Unsteady Reynolds-Averaged Navier-Stokes (URANS) equations using a realisable k-ε model for different inlet
configurations has been used. Numerical simulations were validated by means of experimental measurements. A saline inflow was simulated and
the computed salinity in the outflow was compared with the measured values, with the aim of improving the tank performance based only on simple
modifications of the inlet position and inflow rate. The results show that the URANS technique is able to adequately capture the experimental dilution
curve measured at the outlet of the tank. The residence time is mainly influenced by advective transport. Modifications of the horizontal angle and
Reynolds number of the inflow jet produce changes in the mixing characteristics when different performance indexes are compared.
