Numerical Simulation of Boston Outfall in Stagnant Ambient Current

The mixing processes of a buoyant jet discharged from a submerged multi-port diffuser were analyzed using both length scale and integral type models in this paper. Initial dilutions obtained from a physical model study were simulated with two numerical models; a length scale model (CORMIX2) and an integral type model (VISJET). Flow was discharged through a cluster of 8 port per riser and the ambient water had a non- linear density profile. In general, the result predicted by CORMIX2 and VISJET were relatively in good agreement with the observations. The simulated results indicate that both models are conservative and are able to simulate the dilution in stagnant ambient current and different density profiles. Comparison between the results of VISJET and CORMIX2 shows that, VISJET model can predicted the flow behavior more properly.