Numerical Study of Energy Dissipation of Pooled Stepped Spillways
Abstract: Water transferring
to the dam downstream creates high levels of kinetic energy. Stepped spillways
are amongst the most effective spillways in reducing the kinetic energy of the
flow moving towards the downstream. The geometry of the steps in stepped
spillways can affect the reduction of kinetic energy of the flow transferring
to the downstream. Therefore, in this study the effect of different number of
steps and discharge on flow pattern especially energy dissipation were
investigated. The VOF method was used to simulate the flow surface and the k-ε
(RNG) turbulence model was used for flow turbulence simulation. Comparing the
results obtained from the numerical simulation with the experimental data
indicated an acceptable level of consistency. Comparing the obtained results
showed that decreasing the number of the steps of pooled stepped spillways
reduced flow velocity and increased the relative energy dissipation at the end
of the spillway. Decreasing the number of steps increased the turbulent kinetic
energy value. Also, the maximum turbulent kinetic energy was obtained near the
step’s pool. Moreover the results indicated that the value of turbulent kinetic
energy increased along the spillway.
Author: Khosro Morovati,
Afshin Eghbalzadeh, Saba Soori
Journal Code: jptsipilgg160025
