Abstract
Quasi two-dimensional numerical model for free-surface-pressurized flows was constructed. The model was based on two-dimensional shallow water equations. Since this model calculates flux by the normal direction of the boundary of control volume, it can deal with flow in a sewer network and river channel like a one-dimensional model. The model was also based on flux-difference splitting scheme combined with the Preissmann slot to simulate flows in a closed conduit wherein the flow may change from free-surface to pressurized flow and vice-versa. The model was verified against available experimental data on free-surface or free-surface-pressurized flow. Thereafter, the model was tested against some exacting sample problems. It is demonstrated that the model yields very reasonable results in all the cases considered.
