Numerical simulation of energy loss in the chute with submerge cubic obstacle

In this study, energy loss in chutes with cubic submerged obstacles is investigated. The advantages of this method over previous methods such as stepped spillway are lower risk of cavitation. FLUENT finite volume software was used for the numerical computation. The flow was considered turbulent and incompressible. The turbulent model of k  (RNG) was used in this study. In general, for the range of discharges in this study, the energy lost varies from 11% in 1:4 slope to 66% in 1:5 slope for witness models. The results of energy lost in blocked-bed models showed a linear decrease with a relatively steep slope. In general, the “relative energy lost” was shown to be the most in 1:4 slope and the least in 1:5 slope. Moreover, the energy loss relative to upstream energy varies from 83% in models with 1:4 slope to 45% in the blockedbed models with 1:8 slopes. Also, energy loss in blocked-bed models has been increased from 18 to 41 percent in comparison to the witness models. Using multivariate regression, some equations was developed to estimate energy lost.