FREE-SURFACE-PRESSURIZEDFLOW SIMULATIONS BY F. D. S. SCHEME

Abstract

Flux-difference splitting scheme of Roe for free-surface flow simulations is 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 can simulate conduits with uniform cross-sections of arbitrary shape, with bed slope and bed friction. The model is verified against available experimental data on freesurface-pressurized flow. Thereafter, the model is tested against some exacting sample problems. It is demonstrated that the model yields very reasonable results in all the cases considered. A sensitivity analysis is performed for the size of the slot and useful conclusions are drawn from the study for the simulation of free-surface-pressurized flows.