Finite element modeling of flows in open-channel transitions




To analyze flows in channel expansions and contractions, two-dimensional, depth-averaged, unsteady flow equations are solved by using the two-step Taylor-Galerkin scheme. The 2-D, depth-averaged equations are written in a fully conservative form. The solution algorithm is based on an explicit time integration procedure which exploits the conservative properties of the governing equations. The unsteady flow model is used to obtain steady flow equations by treating the time variable as an iteration parameter and letting the solution converge to the steady state. The results of the mathematical model are compared with experimental data and other models. The capability of the model for handling mixed super- and sub-critical flows in a channel transition is demonstrated