Multiphasemodeling study for stormwater solids treatment in experimental storm water settling chamber

摘要

This study tests four different types of multiphase models to determine the most appropriate modelnfor predicting the behaviors of various types of storm water solids in a settling chamber. ThenLagrangian reference frame discrete phase models of uncoupled and coupled models based on theninteraction between the discrete phase and the continuous phase were tested. The rigid movingnobjects model providing six degrees of freedom particle motion was also tested to model non-nspherical particle motion. The fourth model was a sediment transport model using the Euleriannreference frame model. This study tested five different storm water solids consisting of bulk, gross,ncoarse, sediment and fine which are classified by particle size and settling characteristics. Particlensettling efficiency and computational time were considered in determining the most appropriatenmultiphase model. The coupled model provided better solid settling than the uncoupled model, butnrequired 8.2% more computational time in this study. The Eulerian model matched settling efficiencynfor the high density finer solids. Although the Eulerian model showed reliable settling prediction, thenLagrangian coupled model can be an effective alternative requiring significantly reducedncomputational time.