Document Type : Original Article
Authors
1
Studendt in Hydraulic Structures. Civil Engineering Department, Islamic Azad University, Sirjan Branch, Iran
2
Assistant Professor in Watershed. Engineering Department, Islamic Azad University, Sirjan Branch, Iran
3
Assistant Professor in Hydraulic Structures. Civil Engineering Department, Islamic Azad University, Sirjan Branch, Iran,
Abstract
Flip bucket are one of the most important types of Energy depreciations and it play the role of energy depreciation in Spillway. In this research, the hydraulic flow characteristics of a flip bucket are investigated with FLUENT model. In this study, three types of computational grid (coarse, intermediate, and fine) were used to discriminate the simulation environment. In order to simulate the flow, the k-ε (Standard, RNG, Realizable) and k-ω (standard and SST) models were used. Also, in order to find the best wall function, two types, standard wall and non-equilibrium wall function were investigated. The comparison criterion in this study is also the trajectory profile of jet water. The results show that the fine computational grid, the input speed condition for the flow input boundary, and the output pressure for the boundaries that are in contact with the air, provide the best possible results. Also, the standard wall function is chosen for the effect of the wall function, and the turbulent model k -ε (Standard) has the most consistent results with experimental results. When the jet is getting closer to end of basin, the computational results increase with the numerical results of their differences. The lower profile of the water jet has less sensitivity to the hydraulic jet profile than the hydraulic jet profile. In the pressure test, it was also found that the results show that the numerical values of the pressure in the lower landing number differ greatly in experimental results.
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