Numerical flow model stepped spillways in order to maximize energy dissipation using FLUENT software

Abstract

Stepped spillway energy dissipation has a synergistic effect. In the present study, to identify, the effect of various parameters such as the number of steps (N), the step height (h), the length step (L) and the discharge per unit width (q) on energy dissipation in stepped spillways simple numerical is used numerical method. Relationshipships between the critical depth flow and energy dissipation are presented and discussed in stepped spillways. In this study for solving the governing equations detachable, the finite volume method (Fluent Software) and to assess turbulence flow, is used the standard k-ε models. The regular mesh, is used in a Specified boundary condition and the volume of fluid method (VOF) is used to solve the free-surface flow. Free surface flow,Velocities and pressures in stepped spillway, is modeling by Confused numerical method. The numerical results were compared with Experimental results of other researchers, and the results are a good agreement and the errors Variations is one of the 2%. The results of this study show that with increasingthe flow rate and also by fixed dam height and with increasing the number of steps, is reduced energy dissipation.